British Association (B.A.) screw threads. Requirements Ingestion-build-134498 This European Standard specifies product

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British Association (B.A.) screw threads. Requirements Ingestion-build-134498 This European Standard specifies productBS 93: 2008 British Association (B. A.) screw threads. Requirements BS 93: 2008 specifies limits of sizes, and tolerances, for single start parallel screw threads of British Association (B. A.) form. The standard specifies the British Association (B. A.) system of screw threads, which comprises 17 graded metric sizes designated by the numbers 0 to 16. Approximate inch equivalents are also given. BS 93 specifies the following: basic sizes for B. A.