IS 204:2000 (Part 2) is the Indian Standard (BIS) for tower bolts - specification part-2 non-ferrous metals. 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
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Primary Material (Steel) | Mild Steel conforming to IS 2062. | No specific grade mandated; must pass performance tests. Carbon steel is a common material. | ANSI/BHMA A156.16-2018 |
| Primary Material (Cast Iron) | Grey Cast Iron, Grade FG 150 of IS 210. | Not specified; generally not used in modern performance standards for this application. | BS EN 12051:2000 |
| Durability (Cyclic Test) | Not specified in the standard. | 10,000 cycles (Grade 1 - Normal use); 25,000 cycles (Grade 2 - High use). | BS EN 12051:2000 |
| Corrosion Resistance (Plated Finish) | Recommends zinc plating to IS 1573, but no salt spray duration is mandated in IS 204. | Grade 3 (moderate resistance) requires 96 hours in Neutral Salt Spray (NSS) test. | BS EN 12051:2000 |
| Classification System | Based on nominal size (length), material (steel/cast iron), and type (straight/cranked). | Performance-based grading (e.g., Grade 1, 2, 3) for durability, finish, and material tests. | ANSI/BHMA A156.16-2018 |
| Shoot (Bolt) Diameter for 150mm Bolt | 10.0 mm (min 9.80 mm) | Not explicitly specified; dimension is part of a design that must meet performance tests. | BS EN 12051:2000 |