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ASTM A194

Scope

The ASTM A194 specification covers carbon, alloy and stainless steel nuts intended for use in high-pressure and/or high-temperature service. Unless otherwise specified, the American National Standard Heavy Hex Series (ANSI B 18.2.2) shall be used. Nuts up to and including 1 inch nominal size shall be UNC Series Class  2B fit. Nuts over 1 inch nominal size shall be either UNC Series Class 2B fit or 8 UN Series Class 2B fit. High strength ASTM A194 grade 2H nuts are common in the marketplace and are often substituted for ASTM A563 grade DH nuts due to the limited availability of DH nuts in certain diameters and finishes.

A194 Grades

2Carbon steel heavy hex nuts
2HQuenched & tempered carbon steel heavy hex nuts
2HMQuenched & tempered carbon steel heavy hex nuts, 100% hardness tested
4Quenched & tempered carbon-molybdenum heavy hex nuts
7Quenched & tempered alloy steel heavy hex nuts
7MQuenched & tempered alloy steel heavy hex nuts, 100% hardness tested
7LQuenched & tempered alloy steel heavy hex nuts, Charpy impact tested
8Stainless AISI 304 heavy hex nuts
8MStainless AISI 316 heavy hex nuts

A194 Mechanical Properties

Grade Identification Marking5 Specification Material Nominal Size, In. Tempering Temp. °F Proof Load Stress, ksi Hardness Rockwell See Note
Min Max
7ASTM A194 Grade 7Medium Carbon Alloy Steel, Quenched and Tempered1/4 - 41100175C24C381,2
7MASTM A194 Grade 7MMedium Carbon Alloy Steel, Quenched and Tempered1/4 - 411501501592371,2,3
NOTES:
  1. The markings shown for all grades of A194 nuts are for cold formed and hot forged nuts. When nuts are machined from bar stock, the nut must additionally be marked with the letter 'B'. The letters H and M indicate heat treated nuts.
  2. Properties shown are those of coarse and 8-pitch thread heavy hex nuts.
  3. Hardness numbers are Brinell Hardness.
  4. Nuts that are carbide-solution treated require additional letter A - 8A or 8MA.
  5. All nuts shall bear the manufacturer’s identification mark. Nuts shall be legibly marked on one face to indicate the grade and process of the manufacturer. Marking of wrench flats or bearing surfaces is not permitted unless agreed upon between manufacturer and purchaser. Nuts coated with zinc have an asterisk (*) marked after the grade symbol. Nuts coated with cadmium shall have a plus sign (+) marked after the grade symbol.
  6. Other less common grades exist, but are not listed here.

A194 Chemical Properties

Element 2, 2H, and 2HM 4 7 and 7M (AISI 4140) 8 (AISI 304) 8M (AISI 316)
Carbon0.40% min0.40 - 0.50%0.37 - 0.49%0.08% max0.08% max
Manganese1.00% max0.70 - 0.90%0.65 - 1.10%2.00% max2.00% max
Phosphorus, max0.040%0.035%0.035%0.045%0.045%
Sulfur, max0.050%0.040%0.040%0.030%0.030%
Silicon0.40% max0.15 - 0.35%0.15 - 0.35%1.00% max1.00% max
Chromium0.75 - 1.20%18.0 - 20.0%16.0 - 18.0%
Nickel8.0 - 11.0%10.0 - 14.0%
Molybdenum0.20 - 0.30%0.15 - 0.25%2.00 - 3.00%

 

ASTM Specifications for Nuts

 

Astm Asme A194 - Grade 7M Nuts Application Industries

Sunflex Metal Industries are engaged in manufacturing of robust quality of Astm Asme A194 - Grade 7M Nuts. These Astm Asme A194 - Grade 7M Nuts are widely used in the following industries:

Astm Asme A194 - Grade 7M Nuts Mining Industries
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Astm Asme A194 - Grade 7M Nuts Construction Industries / Building Systems
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Astm Asme A194 - Grade 7M Nuts Petro-Chemical Industries
Astm Asme A194 - Grade 7M Nuts Food Industries
Astm Asme A194 - Grade 7M Nuts Oil & Gas Industries
Astm Asme A194 - Grade 7M Nuts Chemical & Pharmaceutical Industries

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