CD Stud Load/Torque Strengths
INCH Torque figures |
METRIC Torque figures |
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Mild Steel Stainless Steel Aluminum 1100 Aluminum 5356 |
Mild Steel Stainless Steel Aluminum 1100 Aluminum 5356 |
Formulas used to calculate the data shown below are as follows:
A = Mean Effective Thread Area (META) *
D = Nominal Thread Diameter
L = Tensile Load Pounds
N = Threads per Inch
S = Tensile Stress in PSI
T = Torque in Inch Pounds
D = Nominal Thread Diameter
L = Tensile Load Pounds
N = Threads per Inch
S = Tensile Stress in PSI
T = Torque in Inch Pounds
Tensile Load...L = SA
Torque.............T = 0.2 x D x L
META..............A = Pi/4 x {D - (0.9743/N)}²
Torque.............T = 0.2 x D x L
META..............A = Pi/4 x {D - (0.9743/N)}²
* META is used instead of root area in calculating screw strengths because of closer correlation with actual tensile strength.
META is based on mean diameter, which is the diameter of an imaginary coaxial cylinder whose surface
would pass through the thread profile approximately midway between the minor and pitch diameters.
In actual practice a stud should not be used at its yield load.
A factor of safety must be applied.
It is generally recommended that studs be used at no more than 60% of yield.
However the factor of safety may vary up or down, depending on the application.
The user will make this determination.
| THREAD SIZE |
THREAD DIAMETER (in) |
TPI | META (in²) |
YIELD LOAD (lbs) |
ULTIMATE LOAD (lbs) |
YIELD TORQUE (in lbs) |
ULTIMATE TORQUE (in lbs) |
YIELD PSI (min) |
ULTIMATE PSI (min) |
| #4 | 0.1120 | 40 | 0.006 | 211 | 332 | 5 | 7 | 35000 | 55000 |
| #6 | 0.1380 | 32 | 0.009 | 318 | 500 | 9 | 14 | ||
| #8 | 0.1640 | 32 | 0.014 | 490 | 770 | 16 | 25 | ||
| #10 | 0.1900 | 24 | 0.018 | 614 | 964 | 23 | 37 | ||
| #10 | 0.1900 | 32 | 0.020 | 700 | 1100 | 27 | 42 | ||
| 1/4 | 0.2500 | 20 | 0.032 | 1114 | 1750 | 56 | 88 | ||
| 5/16 | 0.3125 | 18 | 0.052 | 1835 | 2884 | 115 | 180 | ||
| 3/8 | 0.3750 | 16 | 0.077 | 2712 | 4262 | 203 | 320 | ||
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| THREAD SIZE |
THREAD DIAMETER (in) |
TPI | META (in²) |
YIELD LOAD (lbs) |
ULTIMATE LOAD (lbs) |
YIELD TORQUE (in lbs) |
ULTIMATE TORQUE (in lbs) |
YIELD PSI (min) |
ULTIMATE PSI (min) |
| #4 | 0.1120 | 40 | 0.006 | 181 | 452 | 4 | 10 | 30000 | 75000 |
| #6 | 0.1380 | 32 | 0.009 | 273 | 681 | 8 | 19 | ||
| #8 | 0.1640 | 32 | 0.014 | 420 | 1051 | 14 | 34 | ||
| #10 | 0.1900 | 24 | 0.018 | 526 | 1315 | 20 | 50 | ||
| #10 | 0.1900 | 32 | 0.020 | 600 | 1500 | 23 | 57 | ||
| 1/4 | 0.2500 | 20 | 0.032 | 955 | 2387 | 48 | 119 | ||
| 5/16 | 0.3125 | 18 | 0.052 | 1573 | 3932 | 98 | 246 | ||
| 3/8 | 0.3750 | 16 | 0.077 | 2325 | 5812 | 174 | 436 | ||
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| THREAD SIZE |
THREAD DIAMETER (in) |
TPI | META (in²) |
YIELD LOAD (lbs) |
ULTIMATE LOAD (lbs) |
YIELD TORQUE (in lbs) |
ULTIMATE TORQUE (in lbs) |
YIELD PSI (min) |
ULTIMATE PSI (min) |
| #4 | 0.1120 | 40 | 0.006 | 121 | 127 | 3 | 3 | 20000 | 21000 |
| #6 | 0.1380 | 32 | 0.009 | 182 | 191 | 5 | 5 | ||
| #8 | 0.1640 | 32 | 0.014 | 280 | 294 | 9 | 10 | ||
| #10 | 0.1900 | 24 | 0.018 | 351 | 368 | 13 | 14 | ||
| #10 | 0.1900 | 32 | 0.020 | 400 | 420 | 15 | 16 | ||
| 1/4 | 0.2500 | 20 | 0.032 | 636 | 668 | 32 | 33 | ||
| 5/16 | 0.3125 | 18 | 0.052 | 1049 | 1101 | 66 | 69 | ||
| 3/8 | 0.3750 | 16 | 0.077 | 1550 | 1627 | 116 | 122 | ||
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| THREAD SIZE |
THREAD DIAMETER (in) |
TPI | META (in²) |
YIELD LOAD (lbs) |
ULTIMATE LOAD (lbs) |
YIELD TORQUE (in lbs) |
ULTIMATE TORQUE (in lbs) |
YIELD PSI (min) |
ULTIMATE PSI (min) |
| #4 | 0.1120 | 40 | 0.006 | 175 | 241 | 4 | 5 | 29000 | 40000 |
| #6 | 0.1380 | 32 | 0.009 | 263 | 363 | 7 | 10 | ||
| #8 | 0.1640 | 32 | 0.014 | 406 | 560 | 13 | 18 | ||
| #10 | 0.1900 | 24 | 0.018 | 508 | 701 | 19 | 27 | ||
| #10 | 0.1900 | 32 | 0.020 | 580 | 800 | 22 | 30 | ||
| 1/4 | 0.2500 | 20 | 0.032 | 923 | 1273 | 46 | 64 | ||
| 5/16 | 0.3125 | 18 | 0.052 | 1520 | 2097 | 95 | 131 | ||
| 3/8 | 0.3750 | 16 | 0.077 | 2247 | 3100 | 169 | 232 | ||
* Torque figures based on assumption that excessive deformation of thread has
not taken relationship between torque/tension out of its proportional range.
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| THREAD SIZE |
THREAD DIAMETER (in) |
TPI | META (in²) |
YIELD LOAD (lbs) |
ULTIMATE LOAD (lbs) |
YIELD TORQUE (in lbs) |
ULTIMATE TORQUE (in lbs) |
YIELD PSI (min) |
ULTIMATE PSI (min) |
| M3 | 0.1181 | 50.80 | 0.008 | 269 | 423 | 6 | 10 | 35000 | 55000 |
| M4 | 0.1575 | 36.29 | 0.013 | 469 | 737 | 15 | 23 | ||
| M5 | 0.1969 | 31.75 | 0.022 | 759 | 1193 | 30 | 47 | ||
| M6 | 0.2362 | 25.40 | 0.031 | 1076 | 1691 | 51 | 80 | ||
| M8 | 0.3150 | 20.32 | 0.056 | 1960 | 3080 | 123 | 194 | ||
| M10 | 0.3937 | 16.93 | 0.089 | 3106 | 4881 | 245 | 384 | ||
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| THREAD SIZE |
THREAD DIAMETER (in) |
TPI | META (in²) |
YIELD LOAD (lbs) |
ULTIMATE LOAD (lbs) |
YIELD TORQUE (in lbs) |
ULTIMATE TORQUE (in lbs) |
YIELD PSI (min) |
ULTIMATE PSI (min) |
| M3 | 0.1181 | 50.80 | 0.008 | 231 | 577 | 5 | 14 | 30000 | 75000 |
| M4 | 0.1575 | 36.29 | 0.013 | 402 | 1005 | 13 | 32 | ||
| M5 | 0.1969 | 31.75 | 0.022 | 651 | 1626 | 26 | 64 | ||
| M6 | 0.2362 | 25.40 | 0.031 | 922 | 2306 | 44 | 109 | ||
| M8 | 0.3150 | 20.32 | 0.056 | 1680 | 4200 | 106 | 265 | ||
| M10 | 0.3937 | 16.93 | 0.089 | 2662 | 6656 | 210 | 524 | ||
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| THREAD SIZE |
THREAD DIAMETER (in) |
TPI | META (in²) |
YIELD LOAD (lbs) |
ULTIMATE LOAD (lbs) |
YIELD TORQUE (in lbs) |
ULTIMATE TORQUE (in lbs) |
YIELD PSI (min) |
ULTIMATE PSI (min) |
| M3 | 0.1181 | 50.80 | 0.008 | 154 | 161 | 4 | 4 | 20000 | 21000 |
| M4 | 0.1575 | 36.29 | 0.013 | 268 | 281 | 8 | 9 | ||
| M5 | 0.1969 | 31.75 | 0.022 | 434 | 455 | 17 | 18 | ||
| M6 | 0.2362 | 25.40 | 0.031 | 615 | 646 | 29 | 31 | ||
| M8 | 0.3150 | 20.32 | 0.056 | 1120 | 1176 | 71 | 74 | ||
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| THREAD SIZE |
THREAD DIAMETER (in) |
TPI | META (in²) |
YIELD LOAD (lbs) |
ULTIMATE LOAD (lbs) |
YIELD TORQUE (in lbs) |
ULTIMATE TORQUE (in lbs) |
YIELD PSI (min) |
ULTIMATE PSI (min) |
| M3 | 0.1181 | 50.80 | 0.008 | 223 | 307 | 5 | 7 | 29000 | 40000 |
| M4 | 0.1575 | 36.29 | 0.013 | 389 | 536 | 12 | 17 | ||
| M5 | 0.1969 | 31.75 | 0.022 | 629 | 867 | 25 | 34 | ||
| M6 | 0.2362 | 25.40 | 0.031 | 892 | 1230 | 42 | 58 | ||
| M8 | 0.3150 | 20.32 | 0.056 | 1624 | 2240 | 102 | 141 | ||
* Torque figures based on assumption that excessive deformation of thread has
not taken relationship between torque/tension out of its proportional range.
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