Flange Bolt Torque Chart & Stud Length Guide
Reference Only: Torque values are reference values based on Sigma Fasteners B7/L7 flange-bolting guidance. Actual torque-to-tension results vary with coating, friction, lubrication, thread condition, reuse, gasket requirements, flange condition, and project specifications. For critical applications, follow the project engineer, gasket/fastener manufacturer, or field-measured tension requirements.
How to Use This Torque Chart
Select the flange pressure class, pipe size, and stud surface condition. The guide will display the matching bolting information, including quantity, stud diameter, recommended stud length, slip blind length, wrench size, and Sigma-reference torque value in foot-pounds.
This guide is built for quick field reference, estimating, purchasing, and matching common flange bolting requirements for industrial PVF applications.
Find Your Flange Bolting Details
Choose a Flange Class and Pipe Size
Your flange bolting details will appear instantly after you make a selection.
Reference Torque
SELECT
| Detail | Value |
|---|---|
| Studs per Flange Connection | Select size |
| How Many Flange Connections? | Use + or − to select complete flange connections. |
| Total Studs Required | Select size |
| Stud Diameter | Select size |
| Recommended Stud Length | Select size |
| Slip Blind Stud Length | Select size |
| Wrench Size | Select size |
Torque source: Sigma Fasteners — Torque for Flange Bolting (B7/L7 Studs). PTFE / fluoropolymer reference uses coefficient of friction f = 0.07; plain B7 reference uses f = 0.13. View Sigma reference.