What are the standard lengths for flush bolts according to IS 5187?

The standard nominal lengths are 100, 150, 200, 250, 300, 450, and 600 mm (Tables 1 & 2).

What are the two main types of flush bolts covered by this code?

Slide type and Lever action type (Clause 1.1).

What is the minimum required 'shoot' or projection for a 150 mm lever action bolt?

The minimum bolt shoot is 16 mm (Table 2).

IS 5187

: 1972

Specification for flush bolts

CurrentSpecializedSpecificationBIMArchitectural · Builder Hardware

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This standard specifies the material, dimensional, and manufacturing requirements for two types of flush bolts: slide action and lever action. It covers standard sizes, tolerances, workmanship, and finishing to ensure interchangeability and quality for use in general building purposes.

Specification for flush bolts

Quick Reference Values

Standard nominal sizes (Length)100, 150, 200, 250, 300, 450, 600 mm

Minimum thickness of brass sheet/strip for body1.25 mm

Minimum thickness of mild steel sheet/strip for body1.25 mm

Minimum bolt shoot (projection) for slide type12 mm

Minimum bolt shoot (projection) for lever action type16 mm

Minimum chromium plating thickness0.003 mm (Service Grade 1 of IS 1337)

Practical Notes

Ensure the material specified (e.g., brass, stainless steel) matches the environmental exposure to prevent corrosion, especially in coastal areas.

The code differentiates between 'slide type' and 'lever action type', which have different dimensions and applications; specify the correct type for the intended use.

Always check for the ISI certification mark on the product or packaging as an assurance of conformity to this standard.