FlangeTorq Bolt Torque Calc

Built for pipefitters, mechanical contractors, and plant maintenance who need ASME PCC-1 flange bolt torque on the iron - not a dashboard you log into.

WHAT IT DOES
Computes flange bolt torque per the ASME PCC-1 4-pass tightening sequence, with bolt load, bolt stress, and the gasket factor / seating stress that drives the calculation. Pulls flange dimensions from ASME B16.5, tensile stress area from ASME B1.1, and bolt-material proof strength from A193 / A320.

INPUTS
- Flange size: 1" to 24"
- Pressure class: 150, 300, 600, 900, 1500
- Gasket type: Spiral Wound, Ring Joint, Flat Non-Asbestos
- Bolt material: B7, B7M, L7, B8 Cl.2 (per A193 / A320)
- Lubricant: Dry, Moly, Anti-Seize, PTFE
- Target bolt stress: 20-80% of yield (slider)

RETURNS
- Torque per bolt in ft-lbs and N·m
- Bolt load per bolt and total assembly load (lb)
- Bolt stress at the selected yield percentage (psi)
- Effective nut factor K
- ASME PCC-1 4-pass tightening sequence: 30%, 60%, 100%, plus a circular check pass

STANDARDS REFERENCED
- ASME PCC-1 - gasket factor, seating stress, tightening pattern
- ASME B16.5 - flange dimensions and bolt count
- ASME B1.1 - tensile stress area
- A193 / A320 - B7, B7M, L7, B8 Cl.2 bolt material specs

WHY THIS APP, NOT THE FREE ONES
- Math is shown - formula and substitution visible for every result. No black box.
- Standards cited - ASME PCC-1, B16.5, B1.1. Inspector-defensible.
- Works offline - refinery turnarounds, plant outages, field digs. Always available.
- No login. No ads. No telemetry. No subscription.

PRICING
$4.99. Pay once, own it. Lifetime access on iPhone, iPad, and Mac via Family Sharing.

NOT A SUBSTITUTE FOR
Project-specific bolt-up procedures. Calibrated torque wrench certificates. ASME PCC-1 elastic interaction passes for tight-fit assemblies. Always cross-reference the engineer-stamped tightening sequence on file.