What types of defects are strictly prohibited in wooden tool handles?

Decay, cross grain, dead knots, insect borings, and deep splits are strictly prohibited as they severely compromise the handle's structural integrity.

What is the prescribed moisture content for timber tool handles?

It typically ranges from 10% to 15%, and the exact value must conform to the specific climatic zone requirements outlined in IS 287.

How is the timber categorized for different tools?

Timber is categorized into different classes (e.g., Class I to Class V) based on its strength, shock resistance, and suitability for specific tools like hammers, axes, or shovels.

IS 620

: 1985

Wooden Tool Handles General Requirements

CurrentRareSpecificationMaterials Science · Timber and Timber Stores

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This standard lays down the general requirements for wooden tool handles, including the selection of suitable timber species, moisture content, permissible defects, and manufacturing guidelines. It is used by tool manufacturers, suppliers, and quality inspectors to ensure the safety, ergonomic quality, and durability of hand tools.

Wooden Tool Handles General Requirements

Quick Reference Values

moisture content limitNormally between 10% to 15% (must conform to IS 287 zones)

maximum slope of grain1 in 15 for impact tool handles

Practical Notes

Ensure the moisture content is balanced to the local environment before fitting; wood shrinkage causes dangerous loose fits in the tool head.

Pay strict attention to grain orientation. Handles with excessive slope of grain or cross grain are highly prone to sudden snapping under impact loads.

Preservative treatments (as per IS 401) should be applied to prevent termite or fungal attack if the handles are to be stored for extended periods.