---
title: "Bolt Torque Spec Calc - Reviews, Revenue and Downloads in United States | Apple App Store"
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 ="
---

# Bolt Torque Spec Calc — United States
> SAE Grade · Metric · Lubed

![Bolt Torque Spec Calc App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/d2/0b/5c/d20b5c23-2536-b2db-b2cb-23ba7a2604a1/AppIcon-0-0-1x_U007epad-0-1-85-220.png/434x0w.png)

**Developer:** [Shanghai Sheyuan Network Technology Co](https://apptail.io/developer/shanghai-sheyuan-network-technology-co-mkXe)
**Category:** Utilities
**Rating:** 3.0/5 (1 ratings)
**Price:** $4.99
**Bundle ID:** com.sy.bolttorquespeccalc
**Store:** Apple App Store
**Country:** United States
**Version:** 1.0.5 (released 2026-06-27)
**Original Release:** 2026-03-23
**Languages:** English

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id6760930975)
**AppTail Page:** [https://apptail.io/app/bolt-torque-spec-calc-Zdhz/united-states](https://apptail.io/app/bolt-torque-spec-calc-Zdhz/united-states)

## Bolt Torque Spec Calc 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.

## Bolt Torque Spec Calc Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/d1/57/06/d15706a1-04a3-676c-3c41-ddcebe5935dd/screenshot_iphone_1.jpg/1284x2778.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/22/08/76/22087628-cc82-cc3f-dd47-543ef4a83e5f/screenshot_iphone_2.jpg/1284x2778.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/e0/7e/76/e07e76bd-a24a-40cc-26c6-4694a28fc6c0/screenshot_iphone_3.jpg/1284x2778.png)

## Bolt Torque Spec Calc Rating Breakdown in United States
- 5 stars: 0 (0%)
- 4 stars: 0 (0%)
- 3 stars: 1 (100%)
- 2 stars: 0 (0%)
- 1 stars: 0 (0%)






## Bolt Torque Spec Calc Available In
- [United States](https://apptail.io/app/bolt-torque-spec-calc-Zdhz/united-states)
- [Azerbaijan](https://apptail.io/app/bolt-torque-spec-calc-Zdhz/azerbaijan)
- [Canada](https://apptail.io/app/bolt-torque-spec-calc-Zdhz/canada)
- [Switzerland](https://apptail.io/app/bolt-torque-spec-calc-Zdhz/switzerland)
- [Ireland](https://apptail.io/app/bolt-torque-spec-calc-Zdhz/ireland)
- [South Africa](https://apptail.io/app/bolt-torque-spec-calc-Zdhz/south-africa)

---

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