Structural & Construction Fasteners — Unbrako IS 3757 / CE Approved

Unbrako Structural and Construction Fasteners are CE-approved, high-strength fastening systems designed for steel structure connections in buildings, bridges, flyovers, metro rail, and heavy industrial infrastructure. The range includes IS 3757 High Strength Structural Bolts in sizes M16 to M30, matching IS 6623 Structural Nuts and IS 6649 Structural Washers — all manufactured to Indian Standards for the domestic construction industry. For modern pre-engineered buildings and structural steel, Unbrako offers Tension Control Structural Bolts (TC bolts) in M12 to M36 that feature a splined end which shears off at the calibrated preload, guaranteeing correct bolt tension without torque wrenches. The range also includes Drop In Anchors for concrete fastening and Rebar Couplers for reinforcement bar splicing. Every structural fastener is tested in Unbrako's NABL ISO/IEC 17025 accredited laboratory and carries full material test certificates. Shri Narayan Machinery LLP in Noida supplies Unbrako structural fasteners for construction projects across Delhi NCR and North India.