Stainless steel bolts, hex cap screws, and studs ranging from ¼” to 1½”.
Scope – This specification covers the chemical and mechanical requirements for stainless steel bolts, hex cap screws and studs in diameters ranging from 1/4″ to 1-1/2″ inclusive. These fasteners are for general purpose usage, and are available in seven alloy groups.
Materials |
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.
Mechanical
|
Alloy Group | Condition | Marking | Diameter Range | Tensile, ksi | Yield, ksi min | Rockwell Hardness |
| 1 | AF | F593A | 1/4 to 1-1/2 | 65 to 85 | 20 | B85 max | |
| A | F593B | 1/4 to 1-1/2 | 75 to 100 | 30 | B65 to 95 | ||
| CW1 | F593C | 1/4 to 5/8 | 100 to 150 | 65 | B95 to C32 | ||
| CW2 | F593D | 3/4 to 1-1/2 | 85 to 140 | 45 | B80 to C32 | ||
| 2 | AF | F593E | 1/4 to 1-1/2 | 65 to 85 | 20 | B85 max | |
| A | F593F | 1/4 to 1-1/2 | 75 to 100 | 30 | B65 to 95 | ||
| CW1 | F593G | 1/4 to 5/8 | 100 to 150 | 65 | B95 to C32 | ||
| CW2 | F593H | 3/4 to 1-1/2 | 85 to 140 | 45 | B80 to C32 |
Chemical
|
Element | Alloy Group 1, Type 304 | Alloy Group 2, Type 316 |
| Carbon, max | 0.08 | 0.08 | |
| Manganese, max | 2.00 | 2.00 | |
| Phosphorus, max | 0.045 | 0.045 | |
| Sulfur, max | 0.030 | 0.030 | |
| Silicon, max | 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, max | 1.00 | ||
| Molybdenum | 2.00 to 3.00 |
Recommended
|
Nuts | Washers |
| F594 | SS304 or SS316 |