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  4. Standard "BS 721-1:1963"
Standard BS 721-1:1963 25.4.1963 preview

BS 721-1:1963

Specification for worm gearing. Imperial units.



STANDARD published on 25.4.1963


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Price397.30 USD excl. VAT
397.30 USD

The information about the standard:

Designation standards: BS 721-1:1963
Publication date standards: 25.4.1963
SKU: NS-76345
The number of pages: 48
Approximate weight : 144 g (0.32 lbs)
Country: British technical standard
Category: Technical standards BS

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Gears

Annotation of standard text BS 721-1:1963 :

Cylindrical involute helicoid worms with a normal pressure angle of 20° in a range of axial modules from 0.052 in to 1 in. Design, formulae for calculating worm and wormwheel dimensions; four gear classes, with tolerances for pitch, profile and worm thread thickness, and five grades of backlash for assembly. Drawings show information to be given when ordering. Appendices: determination of load capacity, design calculations for typical gears, design procedure based on axial pitch of the worm, design of worms to suit standard diametral pitch cutting tools corresponding to the normal pitch of the worm. Status: Confirmed

Latest update: 2026-11-06 (Number of items: 2 209 112)
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