How is the size of a steel back flap hinge designated?

The size is designated by the overall length of the hinge joint (knuckle).

What type of screws are recommended for fixing these hinges?

Countersunk head wood screws conforming to IS 6760 are typically recommended.

What is the requirement for the hinge pin?

The hinge pin must be made of mild steel wire and riveted firmly at both ends to prevent it from coming out during operation.

IS 3843

: 1995

Steel back flap hinges -Specification

CurrentSpecializedSpecificationArchitectural · Builder Hardware

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This standard specifies the requirements for materials, dimensions, manufacture, and finish of steel back flap hinges commonly used for general architectural, building, and cabinet-making purposes.

Steel back flap hinges -Specification

Quick Reference Values

standard sizes50, 65, 75 and 100 mm

tolerance on length± 1.0 mm

tolerance on width± 1.0 mm

hinge pin materialMild steel wire conforming to IS 280

Practical Notes

Ensure the correct gauge (thickness) of steel is utilized based on the hinge size to prevent sagging of doors or flaps over time.

Pay special attention to the protective finish (such as electro-galvanizing or powder coating), as mild steel hinges are highly prone to corrosion in humid environments.