Fastener Technical Articles & Blog

Why HSFG bolts replaced rivets in bridge construction

Why HSFG Bolts Replaced Rivets in Bridges

Suneer Kapoor · 31 August 2026

A riveted joint and a preloaded bolt do the same thing. So why did riveting disappear, what were rivets genuinely good at, and how do you bolt a repair into a hundred-year-old riveted bridge?

Tunnel segment bolts - thread form, types and specification

Tunnel Segment Bolts: Thread Form, Types and How to Specify Them

Suneer Kapoor · 31 August 2026

Radial and circumferential bolts, why the thread is coarse trapezoidal rather than ISO metric, straight versus curved, and what a drawing must state before the order goes out.

HSFG bolts to IS 3757, EN 14399 and ASTM F3125 with coating guidance

HSFG Bolts Explained: IS 3757, EN 14399 and ASTM F3125

Suneer Kapoor · 29 August 2026

What separates the Indian, European and American structural bolting standards, why A325 and A490 are no longer standards of their own, and when to specify black, hot-dip galvanised or zinc flake coating.

Shear connector studs compared with PSR studs

Shear Connector Studs vs PSR Studs: Sizes and Uses

Suneer Kapoor

Both are called shear studs. They are not interchangeable. ISO 13918 size charts, burn-off allowance, PSR stud sizes to ASTM A1044, and a clear rule for which one your drawing needs.

The Rising Demand for Shear Connector Studs in Modern Construction