Overview
HSFG Washer
M16 – M36 | Grade 8.8 & 10.9
Hardened steel washers manufactured to IS 6649 for placement under both the bolt head and nut in HSFG bolt assemblies. The hardened bearing surface prevents indentation and surface damage during high-torque tightening, ensuring the full clamping force is transferred to the joint interface rather than being lost to surface deformation. Essential component of every HSFG assembly in bridges, transmission towers, and slip-critical structural steel connections. Available in black and HDG finishes.
Key Features & Benefits
- Through-hardened to IS 6649 for HSFG assemblies
- Prevents surface indentation during high-torque tightening
- Ensures full clamping force reaches the joint interface
- Mandatory under both bolt head and nut in HSFG assemblies
- Grade 8.8 and Grade 10.9 for high-load structural use
- Black and HDG finishes for all site environments
- Compatible with IS 3757 bolts and IS 6623 nuts
- Consistent hardness ensures repeatable preload results
01
Precision chamfered inside edges prevent point stress wear on structural bolts.
02
Hardened surface resists warping under high tension preload calibrations.
03
Conforms exactly to IS 6649 specifications for structural friction joints.
