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British Association (BA) Screw Threads - BS 93

British Association (BA) Screw Threads BS 93

BS93 Revised in 2008
In September of 2008: BS 93:1951, British Association (B.A.) screw threads - Requirements was withdrawn and superseded by: BS 93:2008, British Association (B.A.) screw threads - Requirements. The 2008 version is a fully revised version which brings the old 1951 version up to date.

BS 93 Brief
BS93, British Association (B.A.) screw threads - Requirements specifies limits of sizes, and tolerances, for single start parallel screw threads of British Association (BA) form. It is not applicable to screw threads associated with interference fits, such as those on the “metal ends” of studs and in the corresponding tapped holes. BS93 BA-series Screw Thread Data Chart.

BS93, British Association (B.A.) screw threads - Requirements specifies the following:
a) Basic sizes for BA threads in sizes #0 BA to #16 BA.
b) Limits of size and limits of tolerance for close and normal class-of-fit external threads in sizes #0 BA to #10 BA.
c) Limits of size and limits of tolerance for normal class external threads in sizes #11 BA to #16 BA.
d) Limits of size and limits of tolerance for the single class-of-fit internal threads I sizes #0 BA to #16 BA.

Supporting Documents
Two documents which may be essential to have at hand to achieve a complete understanding of BS 93 British Association (B.A.) screw threads - Requirements are BS 919 and BS 6528.

Disclaimer
This data is provided as a brief overview of the standard and for general information only. The intention is to provide accurate information; regardless; errors may exist in the supplied information. The actual standard contains much additional information. If accuracy is critical, base your final decisions on the data provided in the root document: BS 93 (this data was taken from BS 93:2008); which is a copyrighted document. To purchase a copy visit an Authorized Reseller.

Original Posting: 3/2/2011
Last Revision: 3/30/2011
Error corrections in, or comments about, the above data can be sent to: gageguy@gagecrib.com

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