What materials are specified for manufacturing sliding bolts in this code?

Mild steel, brass, and aluminium are the primary materials specified for the bolt body and components (Clause 4).

Does this standard cover the screws needed for installation?

Yes, it specifies that a set of matching countersunk head wood screws must be supplied with each bolt (Clause 5.4).

What are the finishing requirements for steel bolts?

Mild steel bolts must be protected against corrosion by methods like zinc plating, black-enamelling, or nickel-chromium plating as specified in Clause 5.2.

How is the strength of the sliding bolt tested?

A static load, varying by bolt size, is applied to the extended bolt for one minute without causing permanent damage or deformation (Clause 8.1).

IS 7534

: 1985

Specification for sliding locking bolts for use with padlocks

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This standard specifies the requirements for materials, dimensions, manufacture, and finish for various types of sliding locking bolts (barrel bolts) made of mild steel, brass, and aluminium. It covers different sizes and includes performance tests for strength and corrosion resistance.

Specification for sliding locking bolts for use with padlocks

Quick Reference Values

Minimum average zinc coating thickness5 µm (as per Clause 5.2.1)

Minimum chromium plating thickness (bright)0.3 µm (as per Clause 5.2.2)

Minimum nickel plating thickness for chromium plating10 µm (as per Clause 5.2.2)

Salt spray test duration for zinc plating24 hours (as per Appendix B)

Minimum tensile strength of steel for staples310 N/mm² (as per Clause 4.1.2)

Static load test for 150mm bolt1.0 kN for 1 minute (as per Clause 8.1)

Practical Notes

Ensure the type (e.g., straight, cranked) and material (steel, brass, aluminium) are correctly specified for the environmental exposure and security level.

The standard differentiates between bolts for light/medium duty (Type 1) and heavy duty (Type 2) applications, which is a key selection criterion.

Always check for the BIS Certification Mark (ISI mark) on the product or packaging to ensure compliance with this standard for quality assurance.