Bolt Torque Spec Calc
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| Rating | Price | |||
|---|---|---|---|---|
| United States | 100%1 | 3.00 | $4.99 | |
| United Arab Emirates | <1%0 | — | AED 19.99 $5.45 | |
| Afghanistan | <1%0 | — | $4.99 | |
| Antigua And Barbuda | <1%0 | — | $4.99 | |
| Anguilla | <1%0 | — | $4.99 | |
| Albania | <1%0 | — | $5.99 | |
| Armenia | <1%0 | — | $5.99 | |
| Angola | <1%0 | — | $4.99 | |
| Argentina | <1%0 | — | $4.99 | |
| Austria | <1%0 | — | €5.99 $6.94 |
Description
Built for mechanics, millwrights, and equipment installers who need bolt torque on the bench - not a desktop tool.
WHAT IT DOES
Looks up torque values for standard bolt sizes and grades using the T = K x D x F formula with K = 0.20. SAE grades 2, 5, and 8 across 28 sizes from #6-32 to 1-1/2 inch. Metric classes 4.6, 8.8, 10.9, and 12.9 across 17 sizes from M3 to M36. Dry vs. lubricated multiplier applied to the result.
INPUTS
Standard: SAE or Metric
Bolt size (28 SAE or 17 metric sizes available)
Bolt grade or class
Lube condition: Dry or Lubricated
RETURNS
Torque in ft-lb
Torque in N·m
CALCULATION BASIS
Torque formula: T = 0.20 x D x F
Preload F = 75% of proof strength times tensile stress area
Lubricated multiplier: 0.75 times the dry value
WHY THIS APP, NOT THE FREE ONES
Math is shown - formula and assumed K factor visible, not hidden.
45 size and grade combinations covered in one tap.
Works offline - shop floor, field repair, no Wi-Fi. Always available.
No login. No ads. No telemetry. No subscription.
PRICING
$1.99. Pay once, own it. Lifetime access on iPhone, iPad, and Mac via Family Sharing.
NOT A SUBSTITUTE FOR
Manufacturer-specified torque values for safety-critical fasteners. Calibrated wrench certificates. Specific K-factor adjustments for anti-seize, plating, or galvanized threads - this app uses K = 0.20 for both dry and lubricated, with the 0.75x multiplier as the only lube adjustment. Verify against the OEM tightening spec for the specific application.