HSFG Fasteners

M16 – M36 | Grade 8.8 & 10.9 | IS 3757

HSFG Bolt

High Strength Friction Grip (HSFG) bolts manufactured to IS 3757 for slip-critical structural steel connections where relative movement between connected members must be fully prevented. Engineered to develop precise clamping force that transfers loads through friction at the joint interface rather than bolt shear. Available in Grade 8.8 and Grade 10.9 with black and hot-dip galvanised finishes. Supplied as a complete assembly with IS 6623 nuts and IS 6649 hardened washers for bridges, transmission towers, crane girders, and heavy industrial steel structures.

M16 – M36 | Grade 8.8 & 10.9

HSFG Nut

High Strength Friction Grip (HSFG) nuts manufactured to IS 6623 for use exclusively with HSFG bolts in slip-critical structural steel connections. Engineered to develop the full clamping force required for friction-type joints. Available in Grade 8.8 and Grade 10.9 with black and hot-dip galvanised finishes. Used in bridges, transmission towers, industrial steel structures, and heavy fabrication where joint integrity under dynamic, shear, and fatigue loads is critical.

M16 – M36 | Grade 8.8 & 10.9

HSFG Washer

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.