| Bolt
Torque Calculations |
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Conversion Factors
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Input here |
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Input here |
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| Diameter (D) |
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inches |
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Diameter (mm) |
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= |
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Inches |
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| Thread Pitch |
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T.P.I. |
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Pitch (mm) |
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= |
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T.P.I. |
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| Yield Strength (Sy) |
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P.S.I. |
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Sy (kgf/mm2) |
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= |
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P.S.I. |
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| Joint type (P) |
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Sy (N/mm2) |
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= |
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P.S.I. |
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| Stress Area (As) |
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in^2 |
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Instructions
for use |
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| Nut Factor (K) |
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Select relevant factors from the
tables below for joint type, yield strength & nut factors. This
calculator is for imperial fasteners, use the conversion factors above if
you have metric fasteners.
This calculator is intended as a guide only. If the application is critical
then use the services of a design engineer.
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| Bolt Torque T = |
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ft/lbs |
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in/lbs |
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Nm |
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| Joint Type |
P |
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Sy (Imperial) |
P.S.I. |
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Sy (Metric) |
P.S.I. |
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| Shear |
0.1 to .02 |
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A193 B16 (2.5" & under) |
105000 |
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3.6 |
25602 |
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| Tension (gasket) |
0.35 to 0.4 |
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A193 B16 (2.5" to 4") |
95000 |
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4.6 |
34136 |
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| Tension (no gasket) |
0.5 to 0.6 |
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A193 B16 (over 4") |
85000 |
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4.8 |
45515 |
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| Vibration |
0.7 or more |
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A193 B7 (2.5" & under) |
105000 |
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5.6 |
42670 |
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| Bolt Stretch measured |
0.85 to 0.95 |
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A193 B7 (2.5" to 4") |
95000 |
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5.8 |
56893 |
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| Structural Shear |
1.0 or more |
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A193 Gr B8 |
30000 |
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6.8 |
68272 |
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A193 Gr B8C |
30000 |
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8.8 |
91030 |
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| Nut Factor |
K |
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A193 Gr B8M |
30000 |
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9.8 |
102408 |
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| Moly paste 700F |
0.067 |
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A193 Gr B8T |
30000 |
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10.9 |
128010 |
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| Anti-seize HD 2400F |
0.085 |
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J429 Gr 4 |
100000 |
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12.9 |
153612 |
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| Copper anti-seize 1800F |
0.10 |
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SAE J429 Gr1 |
36000 |
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| Nickel anti-seize 2600F |
0.11 |
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SAE J429 Gr2 (3/4" to 1-1/2") |
36000 |
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| Copper-graphite anti-seize 1800F
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0.10 |
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SAE J429 Gr5 (1" to 1-1/2") |
81000 |
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| API SA2 |
0.117 |
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SAE J429 Gr8 (1/4" to 1-1/2") |
130000 |
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| Machine oil |
0.15 |
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SAE J429 Gr8.1 (1/4" to-1/2") |
130000 |
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| As received, Alloy or Mild Steel
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.20 |
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SAE J429 Gr8.2 (1/4" to 1") |
130000 |
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| As received, Stainless Steel |
.30 |
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| Cadmium plate (dry) |
.20 |
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| Zince plate (dry) |
.30 |
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