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.
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|
|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.
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Specials and non standard fixings
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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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