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Flange Bolt Torque
v0.1
Method: Nut-factor torque-tension, T = K·F·d (ASME PCC-1)
Flange Bolt Torque Calculator
Preliminary stud-bolt tightening torque — Bolt Yield & ASME VIII-1 App 2 Gasket Seating
1
Input Parameters
Calculation Mode
Bolt Yield sizes torque to a % of bolt yield. Gasket Seating sizes torque to the ASME VIII-1 App 2 required bolt load.
Flange & Material
Torque Basis
%
Torque Matrix — NPS × Class
Torque per bolt (N·m). Click a cell for the full breakdown.
Bolt Material:ASTM A193 B7
| NPS | Cl 150 | Cl 300 | Cl 600 | Cl 900 | Cl 1500 | Cl 2500 |
|---|---|---|---|---|---|---|
| 1/2″ | ||||||
| 3/4″ | ||||||
| 1″ | ||||||
| 1-1/4″ | ||||||
| 1-1/2″ | ||||||
| 2″ | ||||||
| 2-1/2″ | ||||||
| 3″ | ||||||
| 3-1/2″ | — | — | — | |||
| 4″ | ||||||
| 5″ | ||||||
| 6″ | ||||||
| 8″ | ||||||
| 10″ | ||||||
| 12″ | ||||||
| 14″ | — | |||||
| 16″ | — | |||||
| 18″ | — | |||||
| 20″ | — | |||||
| 24″ | — |
< 200 ft-lb — manual / torque wrench≤ 1″ & ≥ 200 ft-lb — torque wrench> 1″–2″ — hydraulic / tensioning> 2″ — bolt tensioning required
Ready to calculate
Select a cell in the torque matrix above to view the full torque breakdown, sequence, and recommended tool method.