ASTM A594 Specification
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ASTM F594 covers the chemical and mechanical requirements for stainless steel nuts in diameters ranging from 1/4″ to 1-1/2″ inclusive and for use with fasteners conforming to ASTM F593. These nuts are for general purpose usage, and are available in seven alloy groups. Below is a basic summary of the common grades within the ASTM F594 specification. A number of other less common grades of ASTM F594 exist, but are not detailed in the description below. The Mechanical table here is limited to Alloy groups 1 and 2, as those are the most common and the Chemical table is only showing the most common alloy grades used for their respective alloy groups.
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F594 Alloy Groups
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 |
*The selection of an alloy within each group is at the discretion of the manufacturer unless the purchaser requests a specific alloy. |
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F594 Mechanical Properties / Condition
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 |
F594 Chemical Requirements
Element, max except as shown |
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% |
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