BS A 31-54:1951+A6:2012

Specification for British Association (B.A.) low tensile screws and nuts for aeronautical purposes. | Status: Confirmed, Current

1 Scope These British Standards cover dimensions, material, finish and part numbers for British Association (B.A.) cheese, round, countersunk, and raised-countersunk head screws, and dimensions, material, finish and code letters for British Association (B.A.) hexagon ordinary (or full) and thin (or lock) nuts for aeronautical use.