Mechanical Requirements for Stainless Steel & Non-Ferrous Fastenerss
| Grade | General Descpription of Material |
Bolts, Screws and Studs | Nuts | ||||||
| Full Size Bolts, Screws, Studs |
Machine Test Sprecimens of Bolts, Screws, Studs |
Hardness Rockwell |
Proof Load Stress |
Hardness Rockwell |
|||||
| Yield
Strength |
Tensile
Strength |
Yield
Strength |
Tensile
Strength |
Elong- ation |
|||||
| Min psi | Min psi | Min psi | Min psi | % Min. | Min | psi | Min | ||
| 303A | Austenitic Stainless Steel- Sol. Annealed |
30,000 | 75,000 | 30,000 | 75,000 | 20 | B75 | 75,000 | B75 |
| 304-A | Austenitic Stainless Steel- Sol. Annealed |
30,000 | 75,000 | 30,000 | 75,000 | 20 | B75 | 75,000 | B75 |
| 304 | Austenitic Stainless Steel- Cold Worked |
50,000 | 90,000 | 45,000 | 85,000 | 20 | B85 | 90,000 | B85 |
| 304-SH | Austenitic Stainless Steel- Strain Hardened |
See Note 6 |
See Note 6 |
See Note 6 |
See Note 6 |
15 | C25 | See Note 6 |
C20 |
| 305-A | Austenitic Stainless Steel- Sol. Annealed |
30,000 | 75,000 | 30,000 | 75,000 | 20 | B70 | 75,000 | B70 |
| 305 | Austenitic Stainless Steel- Cold Worked |
50,000 | 90,000 | 45,000 | 85,000 | 20 | B85 | 90,000 | B85 |
| 305-SH | Austenitic Stainless Steel- Strain Hardened |
See Note 6 |
See Note 6 |
See Note 6 |
See Note 6 |
15 | C25 | See Note 6 |
C20 |
| 316-A | Austenitic Stainless Steel- Sol. Annealed |
30,000 | 75,000 | 30,000 | 75,000 | 20 | B70 | 75,000 | B70 |
| 316 | Austenitic Stainless Steel- Cold Worked |
50,000 | 90,000 | 45,000 | 85,000 | 20 | B85 | 90,000 | B85 |
| 316-SH | Austenitic Stainless Steel- Strain Hardened |
See Note 6 |
See Note 6 |
See Note 6 |
See Note 6 |
15 | C25 | See Note 6 |
C20 |
| XM7-A | Austenitic Stainless Steel- Sol. Annealed |
30,000 | 75,000 | 30,000 | 75,000 | 20 | B70 | 75,000 | B70 |
| XM7 | Austenitic Stainless Steel- Cold Worked |
50,000 | 90,000 | 45,000 | 85,000 | 20 | B85 | 90,000 | B85 |
| 384-A | Austenitic Stainless Steel- Sol. Annealed |
30,000 | 75,000 | 30,000 | 75,000 | 20 | B70 | 75,000 | B70 |
| 384 | Austenitic Stainless Steel- Cold Worked |
50,000 | 90,000 | 45,000 | 85,000 | 20 | B85 | 90,000 | B85 |
| 410-H | Martensitic Stainless Steel- Hardened and Tempered |
95,000 | 125,000 | 95,000 | 125,000 | 20 | C22 | 125,000 | C22 |
| 410-HT | Martensitic Stainless Steel- Hardened and Tempered |
135,000 | 180,000 | 135,000 | 180,000 | 12 | C36 | 180,000 | C36 |
| 416-H | Martensitic Stainless Steel- Hardened and Tempered |
95,000 | 125,000 | 95,000 | 125,000 | 20 | C22 | 125,000 | C22 |
| 416-HT | Martensitic Stainless Steel- Hardened and Tempered |
135,000 | 180,000 | 135,000 | 180,000 | 12 | C36 | 180,000 | C36 |
| 430 | Ferritic Stainless Steel |
40,000 | 70,000 | 40,000 | 70,000 | 20 | B75 | 70,000 | B75 |
| 464-HF | Naval Brass | 15,000 | 52,000 | 14,000 | 50,000 | 25 | B56 | 52,000 | B56 |
| 464 | Naval Brass | 27,000 | 60,000 | 25,000 | 57,000 | 25 | B65 | 60,000 | B65 |
| 462 | Naval Brass | 27,000 | 52,000 | 24,000 | 50,000 | 20 | B65 | 52,000 | B65 |
| 642 | Aluminum Bronze | 35,000 | 72,000 | 35,000 | 72,000 | 15 | B75 | 72,000 | B75 |
| 630 | Aluminum Bronze | 50,000 | 105,000 | 50,000 | 105,000 | 10 | B90 | 105,000 | B90 |
| 614 | Aluminum Bronze | 40,000 | 75,000 | 40,000 | 75,000 | 30 | B70 | 75,000 | B70 |
| 510 | Phosphor Bronze | 35,000 | 60,000 | 35,000 | 60,000 | 15 | B60 | 60,000 | B60 |
| 675 | Manganese Bronze | 22,000 | 55,000 | 22,000 | 55,000 | 20 | B60 | 55,000 | B60 |
| 655-HF | Silicon Bronze | 20,000 | 52,000 | 18,500 | 50,000 | 20 | B60 | 52,000 | B60 |
| 655 | Silicon Bronze | 38,000 | 70,000 | 36,000 | 68,000 | 15 | B75 | 70,000 | B75 |
| 651 | Silicon Bronze | 45,000 | 75,000 | 42,500 | 72,000 | 8 | B75 | 75,000 | B75 |
| 661 | Silicon Bronze | 38,000 | 70,000 | 38,000 | 70,000 | 15 | B75 | 70,000 | B75 |
| NICU- A-HF |
Nickel-Copper Alloy A |
25,000 | 70,000 | 25,000 | 70,000 | 20 | B70 | 70,000 | B70 |
| NICU-A | Nickel-Copper Alloy A |
40,000 | 80,000 | 40,000 | 80,000 | 20 | B80 | 80,000 | B80 |
| NICU-B | Nickel-Copper Alloy B |
40,000 | 80,000 | 40,000 | 80,000 | 20 | B80 | 80,000 | B80 |
| NICU-K | Nickel-Copper Aluminum Alloy |
90,000 | 130,000 | 90,000 | 130,000 | 20 | C24 | 130,000 | C24 |
| 2024-T4 | Aluminum Alloy | 40,000 | 55,000 | 40,000 | 55,000 | 14 | B70 | 55,000 | B70 |
| 6061-T6 | Aluminum Alloy | 35,000 | 42,000 | 35,000 | 42,000 | 12 | B50 | 42,000 | B50 |
Note 6. Austenitic stainless steel, strain hardened bolts, screws, studs, and nuts shall have the following strength per properties.
| Product Size |
Bolts, Screws, Studs | Nuts | |||
| Tested Full Size | Machine Test Specimens, | Proof Load Stress |
|||
| Yield Strength |
Tensile Strength |
Yield Strength |
Tensile Strength |
||
| in. | min psi | min psi | min psi | min psi | psi |
| to 5/8 in. | 100,000 | 125,000 | 90,000 | 115,000 | 125,000 |
| over 5/8 to 1 in. | 70,000 | 105,000 | 65,000 | 100,000 | 105,000 |
| over 1 to 1-1/2 in. | 50,000 | 90,000 | 45,000 | 85,000 | 90,000 |
Hardness Conversion Table
| Brinell Hardness | Rockwell B-Scale | Rockwell C-Scale | Approximate Tensile (lbs/PSI) |
| 653 | - | 62 | 324,000 |
| 627 | - | 60 | 311,000 |
| 601 | - | 59 | 306,000 |
| 578 | - | 57 | 290,000 |
| 578 | - | 57 | 290,000 |
| 555 | - | 56 | 284,000 |
| 534 | - | 54 | 270,000 |
| 514 | - | 53 | 263,000 |
| 495 | - | 51 | 250,000 |
| 477 | - | 50 | 243,000 |
| 461 | - | 49 | 236,000 |
| 444 | - | 47 | 223,000 |
| 429 | - | 47 | 217,000 |
| 415 | - | 45 | 211,000 |
| 401 | - | 42 | 194,000 |
| 388 | - | 41 | 188,000 |
| 375 | - | 40 | 182,000 |
| 363 | - | 38 | 171,000 |
| 352 | - | 37 | 166,000 |
| 331 | - | 36 | 162,000 |
| 321 | - | 34 | 153,000 |
| 311 | - | 33 | 148,000 |
| 302 | - | 32 | 144,000 |
| 293 | - | 31 | 140,000 |
| 285 | - | 30 | 136,000 |
| 277 | - | 29 | 132,000 |
| 269 | - | 28 | 129,000 |
| 262 | - | 27 | 126,000 |
| 255 | - | 25 | 120,000 |
| 248 | - | 24 | 117,000 |
| 241 | 100 | 23 | 115,000 |
| 235 | 99 | 22 | 112,000 |
| 229 | 98 | 21 | 110,000 |
| 223 | 97 | 20 | 108,000 |
| 217 | 96 | - | 103,000 |
| 212 | 96 | - | 103,000 |
| 207 | 95 | - | 101,000 |
| 202 | 94 | - | 98,000 |
| 197 | 93 | - | 96,000 |
| 192 | 92 | - | 93,000 |
| 187 | 91 | - | 91,000 |
| 183 | 90 | - | 89,000 |
| 179 | 89 | - | 87,000 |
| 174 | 88 | - | 85,000 |
| 170 | 87 | - | 83,000 |
| 166 | 86 | - | 81,000 |
| 163 | 85 | - | 80,000 |
| 159 | 84 | - | 78,000 |
| 156 | 83 | - | 77,000 |
| 153 | 82 | - | 76,000 |
| 149 | 81 | - | 75,000 |
| 146 | 80 | - | 74,000 |
| 143 | 79 | - | 73,000 |
| 140 | 78 | - | 71,000 |
| 137 | 77 | - | 70,000 |
| 134 | 76 | - | 69,000 |
| 131 | 74 | - | 67,000 |
| 128 | 73 | - | 66,000 |
| 126 | 72 | - | 65,000 |
| 124 | 71 | - | 63,000 |
| 121 | 70 | - | 62,000 |
| 118 | 69 | - | 61,000 |
| 116 | 68 | - | 60,000 |
| 114 | 67 | - | 59,000 |
| 112 | 66 | - | 58,000 |
| 109 | 65 | - | 57,000 |
| 107 | 64 | - | 55,000 |
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