ASTM A194 - Nuts

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The ASTM A194 specification covers a variety of carbon, alloy, and martensitic stainless steel nuts in the size range 1⁄4 through 4 in. and metric M6 through M100 nominal. ASTM A194 also covers austenitic stainless steel nuts in the size range 1⁄4 in. and M6 nominal and above. These nuts are intended for high-pressure or high-temperature service, or both. Grade substitutions without the purchaser’s permission are not allowed. The material may be further processed by centerless grinding or by cold drawing.

Merica Industries specializes in manufacturing nuts, bolts, and fasteners for all types of applications. You can view our portfolio for some examples of projects featuring our products. If you need a specific application for your project, contact us to discuss your needs. We work with our customers to provide the exact specifications they need for their project – delivered on time to meet your requirements. Below is an outline of Grades, Chemical Requirements, and Markings that will help identify the right combination for specific applications. If you need help matching our products to your project, we can help you find the right solution.

Grades

2 Carbon steel hvy hex nut
2 Quenched & tempered carbon steel hvy hex nut
2HM Quenched & tempered carbon steel hvy hex nut
4 Quenched & tempered carbon-molybdenum hvy hex nut
7 Quenched & tempered alloy steel hvy hex nut
7M Quenched & tempered alloy steel hvy hex nut
8 Stainless AISI 304 hvy hex nut
8M Stainless AISI 316 hvy hex nut

 

  • CHEMICAL REQUIREMENTS
  • IDENTIFICATION MARKINGS

 

Grade Carbon Manganese Phosphorous (max) Sulfur (max) Silicon Chromium Nickel Molybdenum Other Elements
2, 2H and 2 HM 0.40% min. 1.00% max. 0.04% 0.05% 0.40% max
3 0.10% min. 1.00% max. 0.04% 0.03% 1.00% 4.0-6.0% 0.20-0.30%
4 0.40 -0.50% 0.70-0.90% 0.035% 0.04% 0.15-0.35% 0.20-0.30%
6 0.15% 1.00% 0.04% 0.03% 1.00% 11.5-13.5%
6F 0.15% 1.25% 0.06% 0.06% 1.00% 12.0-14.0% Selenium-0.15% min
7 and 7M (AISI 4140) 0.37-0.49% 0.65-1.10% 0.04% 0.04% 0.15-0.035% 0.75-1.20% 0.15-0.25%
8 (AISI 304) 0.08% 2.00% max 0.05% 0.03% 1.00% max 18.0-20.0% 8.0-11.0%
8M (AISI 316) 0.08% 2.00% max 0.05% 0.30% 1.00% max 16.0-18.0% 10.0-14.0% 2.00-3.00%
8C 0.08% 2.00% 0.045% 0.03% 1.00% 17.0-19.0% 9.0-12.0% Columbium and Tantalum – 10x carbon content, min
8T 0.80% 2.00% 0.045% 0.30% 1.00% 17.0-19.0% 9.0-12.0% Titanium-0.70%max, Nitrogen-0.10%
8F 0.15% 2.00% 0.20% 0.15%min 1.00% 17.0-19.0% 8.0-10.0%
8R 0.06% 4.0-6.0% 0.045% 0.03% 1.00% 20.5-23.5% 11.5-13.5% 1.50-3.00% Columbium and Tantalum-0.10-0.30%, Nirogen-0.20-0.40%, Vanadium-0.10-0.30%
8S 0.10% 7.0-9.0% 0.060% 0.03% 3.5-4.5% 16.0-18.0% 8.0-9.0% Nitrogen-0.08-0.18%
16 0.36-0.47% 0.45-0.70% 0.035% 0.40% 0.15-0.35% 0.80-1.15% 0.50-0.65% Vanadium-0.25-0.35%, Aluminum-0.015%

 

Identification Marking Specification Materials
ASTM A194 GRADE 2 ASTM A194 Grade 2 Medium Carbon Steel
ASTM A194 GRADE 2H ASTM A194 Grade 2H Medium Carbon Steel, Quenched and Tempered
ASTM A194 GRADE 2HM ASTM A194 Grade 2HM Medium Carbon Steel, Quenched and Tempered
ASTM A194 GRADE 3 ASTM A194 Grade 3 501 Stainless Steel
ASTM A194 GRADE 4 ASTM A194 Grade 4 Medium Carbon Alloy Steel, Quenched and Tempered
ASTM A194 GRADE 6 ASTM A194 Grade 6 410 Stainless Steel, Quenched and Tempered
ASTM A194 GRADE 6F ASTM A194 Grade 6F 416 Stainless Steel, Quenched and Tempered
ASTM A194 GRADE 7 ASTM A194 Grade 7 Medium Carbon Alloy Steel, Quenched and Tempered
ASTM A194 GRADE 7M ASTM A194 Grade 7M Medium Carbon Alloy Steel, Quenched and Tempered
ASTM A194 GRADE 8 ASTM A194 Grade 8 304 Stainless Steel
ASTM A194 GRADE 8M ASTM A194 Grade 8M 316 Stainless Steel
ASTM A194 GRADE 8C ASTM A194 Grade 8C 347 Stainless Steel
ASTM A194 GRADE 8T ASTM A194 Grade 8T 321 Stainless Steel
ASTM A194 GRADE 8F ASTM A194 Grade 8F 303 Stainless Steel
ASTM A194 GRADE 8R ASTM A194 Grade 8R XM19 – S20910 Nitronic 50
ASTM A194 GRADE 8S ASTM A194 Grade 8S S21800 Nitronic 60
ASTM A194 GRADE 16 ASTM A194 Grade 16 Chromium Molybdenum Vanadium