ASTM A594 - Nuts

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This ASTM F594 specification covers the requirements for stainless steel nuts 0.25 to 1.50 in., inclusive, in nominal diameter in a number of alloys in common use and intended for service applications requiring general corrosion resistance. Seven groups of stainless steel alloys are covered, including ten austenitic, two ferritic, four martensitic, and one precipitation hardening.

Groups

Suitable bolts, hex cap screws, and studs for use with nuts included in this specification are covered by Specification F593. Unless otherwise specified, all bolts, hex cap screws, and studs used with these nuts shall conform to the requirements of Specification ASTM F593 and shall be of the same alloy group.
Alloy Group Alloy Designation Alloy Type
1 303, 304, 304L, 305, 384, XM1, 18-9LW, 302HQ, 303Se Austenitic
2 316, 316L Austenitic
3 321, 347 Austenitic
4 430, 430F Ferritic
5 410, 416, 416Se Martensitic
6 431 Martensitic
7 630 (17-4) Precipitation Hardening

 

  • CHEMICAL PROPERTIES
  • MECHANICAL PROPERTIES

 

Merica Sealing & Fasteners ASTM F594 nuts in all diameters in house and can meet your specific delivery schedule domestically or internationally on the specialty nuts.
Element Alloy Group 1, Type 304 Alloy Group 2, Type 316
Carbon 0.08% 0.08%
Manganese 2.00% 2.00%
Phosphorus 0.045% 0.045%
Sulfur 0.030% 0.030%
Silicon 1.00% 1.00%
Chromium 18.0 to 20.0% 16.0 to 18.0%
Nickel 8.0 to 10.5% 10.0 to 14.0%
Copper 1.00%
Molybdenum 2.00 to 3.00%

 

Alloy Group Condition Marking Diameter Range Proof Stress, Hex Nuts, ksi Proof Stress, Heavy Hex Nuts, ksi Rockwell Hardness
1 AF F594A 1/4 to 1-1/2 70 76 B85 max
A F594B 1/4 to 1-1/2 75 81 B65 to 95
CW1 F594C 1/4 to 5/8 100 108 B95 to C32
CW2 F594D 3/4 to 1-1/2 85 92 B80 to C32
2 AF F594E 1/4 to 1-1/2 70 76 B85 max
A F594F 1/4 to 1-1/2 75 81 B65 to 95
CW1 F594G 1/4 to 5/8 100 108 B95 to C32
CW2 F594H 3/4 to 1-1/2 85 92 B80 to C32