US Bolts - Tensile Strength and Proof Loads
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- Proof Load - is the maximum tensile force that can be applied to a bolt that will not result in plastic deformation
- Clamp load - equals to 75% of proof load
US Bolts - Coarse Threads
Proof Load
| Nom Bolt Size (in) | Grade | |||
|---|---|---|---|---|
| 2 | 5 | 8 | Lamalloy | |
| Proof Load (lbf ) | ||||
| 1/4 | 1750 | 2700 | 3800 | 4600 |
| 5/16 | 2900 | 4450 | 6300 | 7600 |
| 3/8 | 4250 | 6600 | 9300 | 11250 |
| 7/16 | 5850 | 9050 | 12800 | 15400 |
| 1/2 | 7800 | 12100 | 17000 | 20600 |
| 9/16 | 10000 | 15500 | 21800 | 26400 |
| 5/8 | 12400 | 19200 | 27100 | 32750 |
| 3/4 | 18400 | 28400 | 40100 | 48500 |
| 7/8 | 15200 | 39300 | 55400 | 67000 |
| 1 | 20000 | 51500 | 72700 | 87900 |
| 1 1/8 | 25200 | 56500 | 91600 | 110700 |
| 1 1/4 | 32000 | 71700 | 116300 | 140500 |
| 1 3/8 | 38100 | 85500 | 138600 | 167500 |
| 1 1/2 | 46400 | 104000 | 168600 | 203700 |
.
Clamp Load
| Nom Bolt Size (in) | Grade | |||
|---|---|---|---|---|
| 2 | 5 | 8 | Lamalloy | |
| Clamp Load (lbf ) | ||||
| 1/4 | 1313 | 2025 | 2850 | 3450 |
| 5/16 | 2175 | 3338 | 4725 | 5700 |
| 3/8 | 3188 | 4950 | 6975 | 8438 |
| 7/16 | 4388 | 6788 | 9600 | 11550 |
| 1/2 | 5850 | 9075 | 12750 | 15450 |
| 9/16 | 7500 | 11625 | 16350 | 19800 |
| 5/8 | 9300 | 14400 | 20325 | 24563 |
| 3/4 | 13800 | 21300 | 30075 | 36375 |
| 7/8 | 11400 | 29475 | 41550 | 50250 |
| 1 | 15000 | 38625 | 54525 | 65925 |
| 1 1/8 | 18900 | 42375 | 68700 | 83025 |
| 1 1/4 | 24000 | 53775 | 87225 | 105375 |
| 1 3/8 | 28575 | 64125 | 103950 | 125625 |
| 1 1/2 | 34800 | 78000 | 126450 | 152775 |
.
US Bolts - Fine Threads
Proof Load
| Nom Bolt Size (in) | Grade | |||
|---|---|---|---|---|
| 2 | 5 | 8 | Lamalloy | |
| Proof Load (lb) | ||||
| 1/4 | 2000 | 3100 | 4350 | 5280 |
| 5/16 | 3200 | 4900 | 6950 | 8410 |
| 3/8 | 4800 | 7450 | 10500 | 12730 |
| 7/16 | 6550 | 10100 | 14200 | 17200 |
| 1/2 | 8800 | 13600 | 19200 | 23200 |
| 9/16 | 11200 | 17300 | 24400 | 29450 |
| 5/8 | 14100 | 21800 | 30700 | 37100 |
| 3/4 | 20500 | 31700 | 44800 | 54100 |
| 7/8 | 16800 | 43300 | 61100 | 73800 |
| 1 | 21900 | 56400 | 79600 | 96200 |
| 1 1/8 | 28200 | 63350 | 102700 | 124100 |
| 1 1/4 | 35400 | 79400 | 128800 | 155600 |
| 1 3/8 | 43400 | 97300 | 157800 | 190700 |
| 1 1/2 | 52200 | 117000 | 189700 | 229200 |
Clamp Load
| Nom Bolt Size (in) | Grade | |||
|---|---|---|---|---|
| 2 | 5 | 8 | Lamalloy | |
| Clamp Load (lb) | ||||
| 1/4 | 1500 | 2325 | 3263 | 3960 |
| 5/16 | 2400 | 3675 | 5213 | 6308 |
| 3/8 | 3600 | 5588 | 7875 | 9548 |
| 7/16 | 4913 | 7575 | 10650 | 12900 |
| 1/2 | 6600 | 10200 | 14400 | 17400 |
| 9/16 | 8400 | 12975 | 18300 | 22088 |
| 5/8 | 10575 | 16350 | 23025 | 27825 |
| 3/4 | 15375 | 23775 | 33600 | 40575 |
| 7/8 | 12600 | 32475 | 45825 | 55350 |
| 1 | 16425 | 42300 | 59700 | 72150 |
| 1 1/8 | 21150 | 47513 | 77025 | 93075 |
| 1 1/4 | 26550 | 59550 | 96600 | 116700 |
| 1 3/8 | 32550 | 72975 | 118350 | 143025 |
| 1 1/2 | 39150 | 87750 | 142275 | 171900 |
- Grade 2 - Low Carbon Steel - up to 3/4" proof load 55000 psi, minimum tensile strength 74000 psi - 3/4" - 1/1/2" proof load 33000 psi, minimum tensile strength 66000 psi
- Grade 5 - Medium Carbon Steel, Quenched and Tempered - up to 1" proof load 85000 psi - 1" - 1/1/2" proof load 74000 psi, minimum tensile strength 105000 psi
- Grade 8 - Medium Carbon Alloy Steel, Quenched and Tempered - up to 1 1/2" proof load 120000 psi, minimum tensile strength 150000 psi
- Lamalloy - Medium Carbon Alloy Steel, Quenched and Tempered - up to 1 1/2" proof load 145000 psi, minimum tensile strength 180000 psi
- 1 psi = 6.9 kPa
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