A free calculator for flange dimensions, stud size, and torque & hydraulic tension by bolt grade and lube — plus Flangemate Pro to record the joint, log every pass, verify elongation, and issue a sealed bolt-up report. Built by a Red Seal steamfitter.
Pick a size and class — get the numbers, no chart-flipping.
ASME B16.5 and B16.47 (A/B) — OD, bolt circle, raised face, weld-neck thickness, by size and pressure class.
Bolt count and diameter for the joint in front of you, with wrench size.
Bolt stress, target torque by grade + lubricant, and hydraulic tensioner pressures with the over-pull built in.
Runs in any phone, tablet or laptop browser; loads once, then works offline in the field.
The records and the paperwork — done as you bolt, not after.
Organize by client → project → joint. Every joint keeps its frozen spec and target values.
Record torque passes per bolt, or hydraulic tension pressures per pull, with live variance vs target.
UT elongation check against the computed target on the % of studs your client requires.
Issue an immutable, hash-stamped bolt-up record — the documentation a shutdown actually needs.
Sign up free, build records, then upgrade in the app. Cancel anytime. Prices in USD.
Reference tool. Flangemate publishes standard dimensional data and bolting calculations to support qualified trades, and records the results you enter. It does not replace the governing specification, the gasket or manufacturer data, or your engineer's torque/tension procedure (e.g. ASME PCC-1). Always verify against the controlling documents for your joint.