What materials are covered under IS 204 Part 2?

It covers non-ferrous metals, specifically extruded brass, cast brass, and extruded aluminium alloys.

What are the typical sizes of tower bolts specified?

Standard lengths range from 50 mm up to 300 mm.

Are screws included with the tower bolts?

Yes, standard specifies that tower bolts should be supplied with appropriate screws of the same material and matching finish.

IS 204

: 2000

Tower Bolts - Specification Part-2 Non-Ferrous Metals

CurrentSpecializedSpecificationBIMArchitectural · Builder Hardware

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This standard lays down the technical specifications for non-ferrous tower bolts, primarily covering brass and aluminium alloy hardware used for fastening doors and windows. It is used by architects and site engineers to ensure the hardware meets standard dimensions, material grades, tolerances, and corrosion-resistant finishes.

Tower Bolts - Specification Part-2 Non-Ferrous Metals

Quick Reference Values

standard lengths50, 75, 100, 150, 200, 250, and 300 mm

diameter of shoot brass upto 100mm10 mm

diameter of shoot brass 150mm and above12 mm

diameter of shoot aluminium upto 100mm10 mm

anodic coating thickness aluminiumMinimum Grade AC 10 as per IS 1868

Practical Notes

Ensure aluminium tower bolts are properly anodized (typically Grade AC 10) to prevent oxidation and ensure longevity, especially in coastal or damp areas.

Verify the smooth sliding action of the bolt shoot within the barrel during site inspection, as excessive clearance or tightness indicates poor manufacturing tolerance.

When specifying hardware for heavy-duty exterior doors, prioritize larger diameter shoots (12mm or higher) to prevent bending under forced entry.