1. Specification for cadmium-plated steel bolts, 55/65 tonf/in2 (Unified hexagons, 3A Unified threads and close tolerance shanks) for aerospace use. (1st October 1976) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (8 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗