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ASTM A194 Nuts, Fasteners and Fixings

ASTM A194 is a specification for various carbon, alloy, martensitic stainless steel and austenitic stainless steel nuts – designed for high temperature or high pressure service.ASTM A194 Nuts

The carbon, alloy and martensitic stainless steel nuts covered are in the size range 1/4″ to 4″, and M6 to M100 nominal.

The austenitic stainless steel nuts covered are in the size range 1/4″ and M6 nominal and above.

Choosing the right grade will depend on the intended application or assembly, each of which differ slightly in terms of design, service conditions, properties and characteristics.

The most popular grades are A194 2H and 2HM – providing high tensile internally threaded fasteners for use in high strength applications.

Some of the most common grades within the ASTM A194 specification include 3, 4, 6, 7, 7H, 8 and 16. The full list of materials within this specification can be found below.


ASTM A194 Grades
Grades Description
1 Carbon Steel
2 Carbon Steel
2H Carbon Steel
2HM Carbon Steel
3 Ferritic Stainless Steel Type 501
4 Carbon Molybdenum Steel
6 Ferritic Stainless Steel Type 410
6F Ferritic Stainless Steel Type 416 / 416Se
7 Chromium Molybdenum Alloy Steel Type 4140 / 4142 / 4145 / 4140H / 4142H / 4145H
7M Chromium Molybdenum Alloy Steel Type 4140 / 4142 / 4145 / 4140H / 4142H / 4145H
16 Chromium Molybdenum Vanadium Alloy Steel
8 AISI 304 Stainless Steel
8C AISI 347 Stainless Steel
8CLN AISI 347LN Stainless Steel
8M AISI 316 Stainless Steel
8T AISI 321 Stainless Steel
8P AISI 305 Stainless Steel
8N AISI 304N Stainless Steel
8MN AISI 316N Stainless Steel
8LN AISI 304LN Stainless Steel
8MLN AISI 316LN Stainless Steel
8MLCuN UNS S31254 Stainless Steel
9C UNS N08367 Stainless Steel
8A AISI 304 Stainless Steel
8CA AISI 347 Stainless Steel
8CLNA AISI 347LN Stainless Steel
8MA AISI 316 Stainless Steel
8TA AISI 321 Stainless Steel
8FA AISI 303 / 303Se Stainless Steel
8PA AISI 305 Stainless Steel
8NA AISI 304N Stainless Steel
8MNA AISI 316N Stainless Steel
8LNA AISI 303LN Stainless Steel
8MLNA AISI 303LN Stainless Steel
8MLCuNA UNS S31254 Stainless Steel
9CA UNS N08367 Stainless Steel
8R Nitronic 50 / XM-19 / UNS S20910 Stainless Steel
8RA Nitronic 50 / XM-19 / UNS S20910 Stainless Steel
8S UNS S21800 Stainless Steel
8SA UNS S21800 Stainless Steel
8F Type 303 / 303Se Stainless Steel


Due to the speciality of these grades, all products are manufactured to order according to customer requirements.

If you require more information or would like to order a product in one of the ASTM A194 grades, please contact us.

See all materials and finishes here.


Featured: Pin TX Button Security Captive Screws

Available now at Fastenright, Pin TX Button Head Captive Screws feature a security drive for additional protection and are typically supplied with captive washers to create a self-retaining fastener.

Find out more information here.

Specials and non standard fixings

Looking for fixings with an unusual head diameter or thread length?
Need fasteners with a non-standard finish?

Or do you have other special requirements? Custom fasteners are no problem for Fastenright!

Fastener Terminology Glossary

There are a number of confusing names and terms within the Fastener industry, so we have created a handy terminology glossary to help.

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