1. Specification for British Association (B.A.) screw threads with tolerances for sizes 0 B.A. to 16 B.A. (25th May 1951) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (22 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
2. Specification for parallel screw threads of Whitworth form. (26th September 1956) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (54 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗