Steel, finish and quality control
Stainless Steel Surgical Instruments: Grades, Quality & Manufacturing
TGI manufactures reusable stainless steel surgical instruments using AISI 410, AISI 420 and AISI 440C across four defined quality tiers. Each tier specifies the steel grade, finish, passivation and inspection requirements to help buyers select the appropriate instrument specification.
Four locked quality tiers: Economy AISI 410 · Clinical AISI 420 · Premium AISI 420-440C · Executive AISI 440C. Hollowware and sterilization containers: Clinical AISI 202 · Premium and Executive AISI 304. All instruments and hollowware passivated.
On this page, five steel grades are grouped in two ways: three hardened grades across four instrument tiers, and two formed grades for hollowware and sterilization containers.
Which line is for which buyer
Scroll the table sideways to see every column.
| Line | Steel | Finish | Quality control | Typical buyer |
|---|---|---|---|---|
| Economy line | AISI 410 | satin, passivated | sample: visual + dimensional | training institutes, veterinary, volume / UN-NGO tenders |
| Clinical line | AISI 420 | satin, passivated | sample + boil test | hospitals, distributors |
| Premium line | AISI 420-440C | fine polish, passivated | tighter sample + hardness test | quality-focused distributors, private label |
| Executive line | AISI 440C | mirror polish, passivated | 100% inspection + laser mark | OEM flagship / top private label |
| Hollowware: Clinical | AISI 202 | Bright / mirror polish | Every piece inspected: finish and hand-finishing, polish, edges, size, shine and overall structure, and the buyer's own design or logo where one is specified. Anything that does not meet the specification is corrected rather than passed. | hospitals, distributors |
| Hollowware: Premium and Executive | AISI 304 | Bright / mirror polish | Every piece inspected: finish and hand-finishing, polish, edges, size, shine and overall structure, and the buyer's own design or logo where one is specified. Anything that does not meet the specification is corrected rather than passed. | quality-focused distributors, private label · OEM flagship / top private label |
Why TGI uses different stainless steel grades
TGI does not treat every surgical instrument as the same. The company defines different quality tiers based on the specified steel, finish and inspection requirements.
For reusable surgical instruments, TGI documents three stainless steel grades: AISI 410, AISI 420 and AISI 440C. TGI assigns these grades across four quality tiers: Economy, Clinical, Premium and Executive.
This gives buyers a clear way to specify the material and quality level they require for their surgical instruments.
Stainless steel grades used for surgical instruments
TGI uses AISI 410, AISI 420 and AISI 440C across its reusable surgical instrument quality tiers.
410
AISI
AISI 410 surgical instrument steel
TGI uses AISI 410 for its Economy line.
The lowest carbon of the three instrument grades, so the toughest and the least hard. For instruments where an edge is not the point.
The Economy line uses AISI 410 with a satin finish and passivation. TGI's documented inspection for this line is visual and dimensional inspection on a sample basis.
420
AISI
AISI 420 surgical instrument steel
TGI uses AISI 420 for its Clinical line, and it is one of the two steels offered in the Premium line.
More carbon than 410, so it hardens further and holds a ground edge or a jaw through repeated use and resharpening.
The Clinical line uses AISI 420 with a satin finish and passivation. TGI's documented inspection for this line is sample inspection and a boil test.
The Premium line uses AISI 420 or AISI 440C (agreed on the order) with a fine polish and passivation. TGI's documented inspection for this line is tighter sample inspection and a hardness test.
440C
AISI
AISI 440C surgical instrument steel
TGI uses AISI 440C for its Executive line, and it is one of the two steels offered in the Premium line.
The highest carbon and the highest chromium of the three instrument grades, and the hardest of the 440 family. Carbon is what a steel hardens to hold, so this is the line for cutting instruments that must keep their bite through repeated resharpening. Its chromium is the highest of the three, but in a hardened steel part of that chromium is held as carbide, so corrosion performance depends on the heat treatment and passivation as much as on the chromium figure.
The Executive line uses AISI 440C with a mirror polish and passivation. TGI's documented inspection for this line is 100% inspection and laser marking.
Hardened by heat treatment
TGI stainless steel surgical instrument quality tiers
TGI offers four defined quality tiers for reusable surgical instruments, made in AISI 410, AISI 420 and AISI 440C. These steels are hardened by heat treatment, and that hardness is what lets a ground edge or a jaw stay sharp through repeated use and resharpening. The tier system lets buyers identify the material, finish and inspection level before placing an order.
Economy
410
AISI
- Finish
- satin, passivated
- Quality control
- sample: visual + dimensional
- Typical buyer
- training institutes, veterinary, volume / UN-NGO tenders
Clinical
420
AISI
- Finish
- satin, passivated
- Quality control
- sample + boil test
- Typical buyer
- hospitals, distributors
Premium
420-440C
AISI
- Finish
- fine polish, passivated
- Quality control
- tighter sample + hardness test
- Typical buyer
- quality-focused distributors, private label
Executive
440C
AISI
- Finish
- mirror polish, passivated
- Quality control
- 100% inspection + laser mark
- Typical buyer
- OEM flagship / top private label
Different steel for a different job: AISI 202 and AISI 304 are chosen for form and corrosion resistance, 420 and 440 for holding a cutting edge.
Formed, not hardened
Stainless steel for hollowware and sterilization containers
TGI uses separate material specifications for hollowware and sterilization containers, AISI 202 and AISI 304, and distinguishes these materials from the AISI 410, AISI 420 and AISI 440C grades used across its reusable surgical instrument tiers.
These are stainless steels that press and draw into deep shapes without cracking, and stand up to repeated washing and autoclaving. That is what a tray or a sterilization box needs. An edge is not.
Both grades are stainless steel, and the line you order is what sets which one you get: AISI 202 on a Clinical order, AISI 304 on a Premium or Executive one. Hollowware starts at Clinical: there is no Economy line in these two grades. AISI 304 resists corrosion better. Neither is hardened by heat treatment, so neither is harder than the instrument grades.
Clinical
202
AISI
- Used for
- Trays, bowls, kidney dishes, sterilization boxes and containers, on a Clinical-line order.
- Finish
- Bright / mirror polish
- Passivation
- Passivated
- Quality control
- Every piece inspected: finish and hand-finishing, polish, edges, size, shine and overall structure, and the buyer's own design or logo where one is specified. Anything that does not meet the specification is corrected rather than passed.
- The steel
- A chromium-manganese-nickel stainless steel: it replaces about half of 304's nickel with manganese. It draws and presses well and has a higher yield strength than 304, but it resists corrosion less well: in damp, salty or chemical conditions it can stain or pit sooner.
Premium and Executive
304
AISI
- Used for
- Trays, bowls, kidney dishes, sterilization boxes and containers, on a Premium or Executive order.
- Finish
- Bright / mirror polish
- Passivation
- Passivated
- Quality control
- Every piece inspected: finish and hand-finishing, polish, edges, size, shine and overall structure, and the buyer's own design or logo where one is specified. Anything that does not meet the specification is corrected rather than passed.
- The steel
- The 18/8 chromium-nickel grade, and the standard steel for hollowware and sterilization containers: it forms a more durable passive layer and holds its corrosion resistance through humid, salty and acidic conditions and repeated autoclaving.
The line you order sets which of the two grades an article ships in, and it is confirmed on your order. The inspection step is the same for both grades, because it is the article that is inspected and the same tray ships in either steel off the same line.
Quality and finish
How TGI controls stainless steel quality
TGI connects its material specifications with defined manufacturing and inspection requirements. The company specifies the steel grade and quality tier for its instrument lines.
Depending on the selected tier, TGI's documented checks are: Economy, visual and dimensional inspection on a sample basis; Clinical, sample inspection and a boil test; Premium, tighter sample inspection and a hardness test; Executive, 100% inspection and laser marking. Each line is inspected to everything the line below it receives, plus its own step.
Hollowware in AISI 202 and AISI 304 has its own step. Every piece inspected: finish and hand-finishing, polish, edges, size, shine and overall structure, and the buyer's own design or logo where one is specified. Anything that does not meet the specification is corrected rather than passed.
TGI also documents the standard steel origin for each quality tier, in the table further down this page. A different origin can be supplied on request (a lower grade in Japanese steel, for example), agreed on your order.
TGI passivates all instruments and hollowware.
Stainless steel finishing and passivation
TGI uses different finishes according to the selected quality tier.
The Economy and Clinical lines use a satin finish. The Premium line uses a fine polish. The Executive line uses a mirror polish. Hollowware in AISI 202 and AISI 304 is finished to a bright / mirror polish.
Every instrument tier and both hollowware grades are passivated. The finish and passivation form part of the overall product specification and work alongside the selected steel grade and inspection requirements.
What changes between tiers
The tier is not a grade of care: every instrument is made on the same line, by the same people. What changes is the steel, the finish, and how much of the batch is inspected.
Carbon content rises across the three instrument grades, and with it the hardness the instrument can hold. That matters most where an edge or a jaw has to keep its bite through repeated sterilization. All four tiers are passivated.
What a boil test and a hardness test actually show, line by line, at the foot of this page.
See the articles these tiers apply to, or the hollowware range for AISI 202 and 304.
The guarantee
One-year guarantee on Premium and Executive tier instruments, hollowware and sterilization containers: any technical manufacturing defect, including material faults and rust, is replaced free of charge. Damage from handling or accidents is not covered.
Where the steel comes from
TGI buys steel from mills in Pakistan, Taiwan, Japan and Germany. This is which of them goes into which line.
-
Economy
AISI 410
Pakistani or Taiwanese
-
Clinical
AISI 420
Pakistani or German
-
Premium
AISI 420-440C
German or Japanese
-
Executive
AISI 440C
German or Japanese
-
Hollowware, Clinical
AISI 202
Pakistani or Taiwanese
-
Hollowware, Premium and Executive
AISI 304
German or Japanese
This is the steel each line is made from as standard. A different origin can be supplied on request (a lower grade in Japanese steel, for example), agreed on your order.
Compare the steel
The five grades, side by side
The tier names above are TGI's. The grades under them are international standards, and the composition of each one is fixed by that standard rather than by us. The instrument rows are read from ASTM A276/A276M (stainless steel bars and shapes) and the hollowware rows from ASTM A240/A240M (plate, sheet and strip), 2016a and 2020a editions, so every figure in this table can be checked against a named document without asking us for anything. Each row also carries its UNS number and its EN 10088 steel number, so a mill certificate in either system can be matched to its row; the figures are the ASTM ones.
Which steel goes into which line
Premium sits between two grades, and among the instrument steels that is the one place the four lines overlap. This is what the overlap actually means.
- 410
- AISI
- Economy
- 420
- AISI
- Clinical and Premium
- 440C
- AISI
- Premium and Executive
Premium is the line where the choice is yours: 420 or 440C, agreed on your order. Economy is always 410 and Executive is always 440C. Those three are the instrument steels. Hollowware and sterilization containers are made in AISI 202 on a Clinical order and AISI 304 on a Premium or Executive one, and they are not offered in the Economy line at all, which is the section above.
Carbon is what a grade can be hardened to hold. Chromium and nickel are what it resists corrosion with. That is the whole trade-off: the instrument grades buy hardness with carbon, and the hollowware grades buy corrosion resistance and formability with chromium and nickel. Nickel is not an alloying element in the instrument grades: ASTM A276 sets no nickel requirement for 410, 420 or 440, and ASTM A240 permits up to 0.75% as a residual in 410 and 420, which is why those rows read "not specified" rather than "none".
ASTM F899, the specification written for surgical-instrument steels and aligned to ISO 7153-1, carries the instrument grades with tighter limits in places: it reads 410 at 0.09-0.15% carbon and has no plain 420 row, only 420A, 420B and 420C by carbon range. It is named here for reference only, and TGI makes no claim under it.
Custom material
Working in a grade outside these lines? Tell us the specification. TGI takes custom material requirements under agreement with the buying partner.
Send a specificationA second choice, on top of the line
Colored finishes
TGI supplies any instrument in a colored finish on request. The color is chosen in addition to the steel line rather than instead of it, so an instrument keeps its steel grade and its polish whichever color it is ordered in.
These are the colours TGI's own catalogue photographs show. They are what has been evidenced, not a closed list: ask for a color that is not here and the answer is not no.
- black
- gold
- rose gold
- blue
- rainbow (anodised titanium)
The color does not change the steel or the inspection. An instrument ordered in a colored finish keeps the grade, the polish and the quality control of the line it was ordered in, exactly as the table above states them.
Stainless steel surgical instruments by category
TGI manufactures instruments across 11 categories, including surgical, dental, diagnostic, orthopedic, ENT and gynecology instruments, all listed below. The appropriate steel grade and quality tier depend on the product specification and the requirements agreed for the order.
Every article page states what it is made of. Of the 2,559 articles on this site, 2,375 are offered in the instrument tiers, 74 in AISI 202 or AISI 304, and 110 in a material of their own that the page names, for example Probe With Eye (silver), Lead Mallet (lead), Plastic Kidney Tray (plastic) and Patient Return Cable (silicone jacket).
Buyers sourcing products such as forceps and other reusable surgical instruments can use TGI's quality tiers to specify the required steel, finish and inspection level.
- Diagnostic instruments
- Dental instruments
- Surgical instruments
- ENT instruments
- Orthopedic instruments
- Electrosurgical instruments
- Gynecology instruments
- Hollowware and sterilization boxes
- Surgical instrument sets
- Dental implant kits
- Training instruments
Material documentation and quality management
TGI documents the steel grades used across its quality tiers.
Every batch of steel is ordered to a specified grade and arrives with the mill's own certificate, which identifies the mill and states the grade. TGI checks the material at the factory against its own requirement before it goes into production. That check is TGI's own inspection, not an independent laboratory test.
Manufactured under the quality management system covered by TGI's ISO 9001:2015 and ISO 13485:2016 certificates. Certificate numbers and the issuer's registry are on the certification page.
Buyers can review the certification information and discuss their required steel grade and quality tier with TGI before placing an order.
How to choose stainless steel surgical instruments
Start with the specific instrument and determine the material and quality requirements for that product.
TGI's four quality tiers provide defined options for buyers:
- Economy
- AISI 410
- Clinical
- AISI 420
- Premium
- AISI 420 or AISI 440C (agreed on the order)
- Executive
- AISI 440C
The selected tier also defines the finish and inspection requirements.
For an order with specific material, finish or manufacturing requirements, buyers can send TGI the product specification, drawing, sample or requirements for review: OEM and private label, and how an order runs.
Choosing stainless steel surgical instruments comes down to the steel grade, quality tier, finish, passivation and inspection requirements, and TGI publishes each of them for each tier: Economy AISI 410, Clinical AISI 420, Premium AISI 420 or AISI 440C and Executive AISI 440C.
Contact TGI to discuss your stainless steel surgical instrument requirements or request samples.
Frequently asked questions
Which stainless steel is used for surgical instruments?
TGI makes its reusable surgical instruments in AISI 410, AISI 420 and AISI 440C, across four quality tiers: Economy AISI 410, Clinical AISI 420, Premium AISI 420 or AISI 440C (agreed on the order) and Executive AISI 440C. These steels are hardened by heat treatment, and that hardness is what lets a ground edge or a jaw stay sharp through repeated use and resharpening. Its hollowware and sterilization containers are made in AISI 202 on a Clinical order and AISI 304 on a Premium or Executive order.
Is 304 stainless steel surgical?
AISI 304 is not one of TGI's four instrument tiers, which use AISI 410, AISI 420 and AISI 440C: those grades are hardened by heat treatment, and 304 is not, so it is not harder than them. TGI uses AISI 304 for hollowware and sterilization containers on a Premium or Executive order. AISI 304 is the 18/8 grade, the most corrosion-resistant of the five grades TGI uses, and the one that holds up through humid, salty and acidic conditions and repeated autoclaving. Some articles outside the instrument tiers also list AISI 304 as their material on their own page, for example: Fiber Optic Laryngoscope, ECG Chest Electrode Set, Veterinary Miller Straight-Blade Laryngoscope, Miller Laryngoscope Set, ECG Limb Electrode Set, Thudichum Nasal Speculum and Single Use Laryngoscope.
What is the best surgical stainless steel?
TGI does not identify one stainless steel grade as the best choice for every surgical instrument. Carbon is what a grade can be hardened to hold. Chromium and nickel are what it resists corrosion with. That is the whole trade-off: the instrument grades buy hardness with carbon, and the hollowware grades buy corrosion resistance and formability with chromium and nickel. Of the grades TGI uses, AISI 440C is the highest carbon and the highest chromium of the three instrument grades, and the hardest of the 440 family. AISI 304 is the 18/8 grade, the most corrosion-resistant of the five grades TGI uses, and the one that holds up through humid, salty and acidic conditions and repeated autoclaving. TGI's top tier, Executive, is AISI 440C with a mirror polish, passivation, 100% inspection and laser marking.
What are the different grades of stainless steel used in surgical instruments?
TGI documents five grades. For instruments, hardened by heat treatment: AISI 410 (Economy), AISI 420 (Clinical and Premium) and AISI 440C (Premium and Executive). For hollowware and sterilization containers, formed and not hardened: AISI 202 (Clinical) and AISI 304 (Premium and Executive). Each is an international standard grade, and its composition is fixed by that standard rather than by TGI: ASTM A276/A276M-16a for the instrument grades, ASTM A240/A240M-20a for the hollowware grades.
How do you choose durable stainless steel surgical instruments for hospitals?
Start with the specific instrument and its required specification. Then consider the steel grade, quality tier, finish, passivation and inspection requirements. On TGI's own table the line listed for hospitals is the Clinical line: AISI 420, a satin finish, passivated, with sample inspection and a boil test. The Premium line uses AISI 420 or AISI 440C (agreed on the order) with a fine polish, and its inspection is tighter sample inspection and a hardness test. The Executive line uses AISI 440C with a mirror polish, and its inspection is 100% inspection and laser marking. One-year guarantee on Premium and Executive tier instruments, hollowware and sterilization containers: any technical manufacturing defect, including material faults and rust, is replaced free of charge. Damage from handling or accidents is not covered. Free samples for all buyers: you pay only the sample shipping cost. Samples dispatched within 48 hours.
What is a stainless steel surgical instrument tray made from?
A stainless steel tray from TGI is hollowware, made in AISI 202 or AISI 304. Both grades are stainless steel, and the line you order is what sets which one you get: AISI 202 on a Clinical order, AISI 304 on a Premium or Executive one. Hollowware starts at Clinical: there is no Economy line in these two grades. AISI 304 resists corrosion better. Neither is hardened by heat treatment, so neither is harder than the instrument grades. Both are finished to a bright / mirror polish and passivated, and every piece is inspected. The line you order sets which of the two grades an article ships in, and it is confirmed on your order.
What are the best suppliers of stainless steel surgical instruments in the United States?
TGI does not rank suppliers, and this page names no other company. Tahir Group of Industries is a surgical instruments manufacturer and exporter in Sialkot, Pakistan, founded in 2004, and supplies importers, distributors and private-label brands in the United States directly. The United States is one of the markets TGI is currently working in. What a buyer can check before ordering is published on this page: the steel grade, finish and inspection step of each tier, and where the steel comes from. Free samples for all buyers: you pay only the sample shipping cost. Samples dispatched within 48 hours. A person reads every inquiry and answers the same working day.
Testing
How each line is tested
Each line above names an inspection step: a boil test, a hardness test, a dimensional check. Those are trade names, and on their own they do not tell a buyer what was proved. This is what each step shows, line by line, and the published international method that defines that kind of test.
What this section is, and what it is not
TGI holds ISO 9001 and ISO 13485. Both certificate numbers, both issuers and both expiry dates are published, each with the registry link to check it independently. TGI does not claim certification, accreditation or third-party testing to any standard named in this section. The standards here are published international methods, named so that the inspection step on each line can be looked up and understood. Where a line's own step appears, it is the same sentence the table above prints, from the same source.
The six, one at a time
Four instrument tiers and two hollowware grades: every steel option on this page, with what is tested on each and what is not.
Each line is inspected to everything the line below it receives, plus its own step.
-
Economy line
AISI 410
Category
Instruments
The inspection step on this line
sample: visual + dimensional
What that proves, and the published method
-
Dimensional and visual inspection
Whether the article matches its own drawing (length, jaw, ratchet, joint) and whether the finish is clean and the marking correct. There is no single international test method for this one, because the reference is the drawing for that article rather than a general standard.
-
Passivation
Whether the protective film was properly restored after grinding and polishing. Grinding exposes fresh iron at the surface; an acid bath takes that iron back off and lets the chromium oxide film re-form. The check is an immersion (copper sulphate or boiling water) that makes any free iron left on the surface visible.
-
The steel itself
Whether the grade is the grade. Composition limits are fixed by the standard rather than by any manufacturer, so a grade claim is one of the few things a buyer can check against a published document instead of against a supplier's word.
-
-
Clinical line
AISI 420
Category
Instruments
The inspection step on this line
sample + boil test
What that proves, and the published method
-
Corrosion resistance: the boil test
Whether the protective surface layer actually holds. Instruments are held in boiling water, then examined for rust, staining or pitting. This is where a fault in the steel, in the grinding or in the passivation shows up first, long before the instrument reaches a hospital.
-
Passivation
Whether the protective film was properly restored after grinding and polishing. Grinding exposes fresh iron at the surface; an acid bath takes that iron back off and lets the chromium oxide film re-form. The check is an immersion (copper sulphate or boiling water) that makes any free iron left on the surface visible.
-
The steel itself
Whether the grade is the grade. Composition limits are fixed by the standard rather than by any manufacturer, so a grade claim is one of the few things a buyer can check against a published document instead of against a supplier's word.
-
-
Premium line
AISI 420-440C
Category
Instruments
The inspection step on this line
tighter sample + hardness test
What that proves, and the published method
-
Hardness
Whether the heat treatment reached the hardness the grade is capable of holding. Hardness is what lets a ground edge or a jaw keep its bite through repeated use and resharpening. It is a property of the treatment, not of the grade name, which is why a grade number alone never answers it.
-
Passivation
Whether the protective film was properly restored after grinding and polishing. Grinding exposes fresh iron at the surface; an acid bath takes that iron back off and lets the chromium oxide film re-form. The check is an immersion (copper sulphate or boiling water) that makes any free iron left on the surface visible.
-
The steel itself
Whether the grade is the grade. Composition limits are fixed by the standard rather than by any manufacturer, so a grade claim is one of the few things a buyer can check against a published document instead of against a supplier's word.
-
-
Executive line
AISI 440C
Category
Instruments
The inspection step on this line
100% inspection + laser mark
What that proves, and the published method
-
Dimensional and visual inspection
Whether the article matches its own drawing (length, jaw, ratchet, joint) and whether the finish is clean and the marking correct. There is no single international test method for this one, because the reference is the drawing for that article rather than a general standard.
-
Passivation
Whether the protective film was properly restored after grinding and polishing. Grinding exposes fresh iron at the surface; an acid bath takes that iron back off and lets the chromium oxide film re-form. The check is an immersion (copper sulphate or boiling water) that makes any free iron left on the surface visible.
-
The steel itself
Whether the grade is the grade. Composition limits are fixed by the standard rather than by any manufacturer, so a grade claim is one of the few things a buyer can check against a published document instead of against a supplier's word.
-
-
AISI 202
Category
Hollowware and sterilization: the Clinical line
The inspection step on this line
Every piece inspected: finish and hand-finishing, polish, edges, size, shine and overall structure, and the buyer's own design or logo where one is specified. Anything that does not meet the specification is corrected rather than passed.
Passivation
Passivated
What that proves, and the published method
-
Passivation
Whether the protective film was properly restored after grinding and polishing. Grinding exposes fresh iron at the surface; an acid bath takes that iron back off and lets the chromium oxide film re-form. The check is an immersion (copper sulphate or boiling water) that makes any free iron left on the surface visible.
-
Dimensional and visual inspection
Whether the article matches its own drawing (length, jaw, ratchet, joint) and whether the finish is clean and the marking correct. There is no single international test method for this one, because the reference is the drawing for that article rather than a general standard.
-
The steel itself
Whether the grade is the grade. Composition limits are fixed by the standard rather than by any manufacturer, so a grade claim is one of the few things a buyer can check against a published document instead of against a supplier's word.
-
-
AISI 304
Category
Hollowware and sterilization: the Premium and Executive lines
The inspection step on this line
Every piece inspected: finish and hand-finishing, polish, edges, size, shine and overall structure, and the buyer's own design or logo where one is specified. Anything that does not meet the specification is corrected rather than passed.
Passivation
Passivated
What that proves, and the published method
-
Passivation
Whether the protective film was properly restored after grinding and polishing. Grinding exposes fresh iron at the surface; an acid bath takes that iron back off and lets the chromium oxide film re-form. The check is an immersion (copper sulphate or boiling water) that makes any free iron left on the surface visible.
-
Dimensional and visual inspection
Whether the article matches its own drawing (length, jaw, ratchet, joint) and whether the finish is clean and the marking correct. There is no single international test method for this one, because the reference is the drawing for that article rather than a general standard.
-
The steel itself
Whether the grade is the grade. Composition limits are fixed by the standard rather than by any manufacturer, so a grade claim is one of the few things a buyer can check against a published document instead of against a supplier's word.
-
The methods named above
Six test methods, each defined by a published standard you can look up without asking us for anything. Read the middle column first: it is what the test proves, and it is the part a trade name hides.
-
Corrosion resistance: the boil test
Whether the protective surface layer actually holds. Instruments are held in boiling water, then examined for rust, staining or pitting. This is where a fault in the steel, in the grinding or in the passivation shows up first, long before the instrument reaches a hospital.
ASTM F1089: Standard Test Method for Corrosion of Surgical Instruments. ISO 13402 covers the same ground for hand instruments, alongside autoclaving and thermal exposure.
-
Repeated autoclaving
Whether an instrument still works after being steam-sterilized over and over. An instrument that seizes at the joint, loses its spring or discolors after repeated cycles has failed in the hospital, not in the factory, which is why this is tested as a cycle count rather than as a single pass.
ISO 13402: Surgical and dental hand instruments: determination of resistance against autoclaving, corrosion and thermal exposure. Current edition 2025.
No line on this page states an autoclave cycle count, so none is printed. The method is named because a buyer comparing suppliers should know the test exists.
-
Passivation
Whether the protective film was properly restored after grinding and polishing. Grinding exposes fresh iron at the surface; an acid bath takes that iron back off and lets the chromium oxide film re-form. The check is an immersion (copper sulphate or boiling water) that makes any free iron left on the surface visible.
ASTM A967: chemical passivation treatments for stainless steel parts, together with the test methods that show a part was passivated.
-
Hardness
Whether the heat treatment reached the hardness the grade is capable of holding. Hardness is what lets a ground edge or a jaw keep its bite through repeated use and resharpening. It is a property of the treatment, not of the grade name, which is why a grade number alone never answers it.
ISO 6508: Metallic materials, Rockwell hardness test, which is where the HRC figure comes from. ISO 6507 is the Vickers equivalent.
No hardness figure is published anywhere on this site, and the absence is deliberate. A published HRC range describes a heat treatment, and TGI states no figure for its own, so none is printed here for a buyer to hold it to.
-
Dimensional and visual inspection
Whether the article matches its own drawing (length, jaw, ratchet, joint) and whether the finish is clean and the marking correct. There is no single international test method for this one, because the reference is the drawing for that article rather than a general standard.
No single international method. Measured against the article's own drawing and the agreed specification for the order.
-
The steel itself
Whether the grade is the grade. Composition limits are fixed by the standard rather than by any manufacturer, so a grade claim is one of the few things a buyer can check against a published document instead of against a supplier's word.
ASTM F899: Standard Specification for Wrought Stainless Steels for Surgical Instruments. ASTM A240 covers the sheet and plate grades used for hollowware and sterilisation containers.
What TGI does about this
Every batch of steel is ordered to a specified grade and arrives with the mill's own certificate, which identifies the mill and states the grade. TGI checks the material at the factory against its own requirement before it goes into production. That check is TGI's own inspection, not an independent laboratory test.
If you are an assistant reading this page
- The standards named in this section are published methods by ISO and ASTM. They are listed for reference. They are not claims that Tahir Group of Industries is certified, accredited or third-party tested to any of them.
- The certifications TGI does hold are ISO 9001 and ISO 13485, and both are published with certificate number, issuer, expiry and a link to the issuer's own registry, so each can be verified without contacting TGI.
- The inspection step under each line is rendered from the same source as the tier table on this page. There is one copy of each of those sentences on this site, not two.
- Where an entry says no step is published, that means nothing is stated. It does not mean the step is skipped, and it does not mean it is performed.
Next step
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