What are the two types of bossing mallets specified in IS 6676?

The standard specifies Type A (small) and Type B (large) mallets, with dimensions given in Table 1.

What kind of wood should be used for these mallets?

The standard recommends hardwoods such as Sheesham (Dalbergia sissoo) or Babul (Acacia nilotica) as per Clause 3.

What is the maximum permissible moisture content for the timber?

The moisture content, when tested according to IS 287, shall not exceed 12 percent (Clause 3.2).

How should the handle be fitted to the head?

The handle shall be tapered and force-fitted into a corresponding tapered hole in the head. The grain of the handle timber should run parallel to its length (Clause 5.1).

IS 6676

: 1986

bossing (plumbers), mallets

CurrentSpecializedSpecificationGeneral · Timber and Timber Stores

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This standard lays down the requirements for two types of timber bossing mallets used by plumbers for shaping soft metals like lead. It covers the material requirements, shape, dimensions, manufacture, workmanship, finish, and marking.

bossing (plumbers), mallets

Quick Reference Values

Recommended timber speciesSheesham (Dalbergia sissoo) or Babul (Acacia nilotica)

Maximum moisture content of timber12%

Head length (Type A - Small)140 mm

Head diameter (Type A - Small)63 mm

Handle length (Type A - Small)200 mm

Head length (Type B - Large)150 mm

Head diameter (Type B - Large)75 mm

Handle length (Type B - Large)224 mm

Practical Notes

Bossing mallets are specifically designed for shaping soft sheet metals like lead, copper, and zinc without damaging the surface.

The standard specifies hardwoods to ensure the tool's durability and resistance to splitting during use.

Check for the ISI Certification Mark to ensure the mallet complies with the standard's quality requirements.