What is the standard taper for IS 5372 washers?

The standard specifies a mean taper of 1 in 6 (Clause 3.2).

What material are these washers made from?

They are made from steel conforming to IS 2062 (formerly IS 226) as per Clause 4.1.

How is a taper washer for a 20mm bolt designated?

It is designated as 'Taper Washer 20 IS 5372' (Clause 6).

What is the primary use of a taper washer?

To create a parallel surface for a bolt head or nut when bolting through the tapered flange of a structural channel or I-beam.

IS 5372

: 1990

Taper washers for channels

CurrentSpecializedSpecificationBIMStructural Engineering · Fasteners, Bolts and Anchors

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This standard provides specifications for the material, dimensions, and other requirements for steel taper washers. These washers are specifically designed for use with Indian Standard channel sections (ISMC) to provide a flat, parallel bearing surface for bolt heads and nuts on their sloped flanges.

Specifies dimensions and other requirements for taper washers for use with channels.

Quick Reference Values

Taper slope1:6

Applicable bolt sizes10 mm to 36 mm

Material specificationSteel conforming to IS 2062

Hardness requirementMinimum 100 HV

Practical Notes

Essential for preventing bending stress in bolts when fastening through the sloped flange of a channel or I-beam.

Ensure the washer is oriented correctly, with its tapered face against the tapered flange of the channel.

Used in conjunction with standard high-strength or black bolts, nuts, and sometimes a plain washer under the nut/head.