What Are BA Spanner Sizes?
What Are BA Spanner Sizes? Bolt dia. AF spanner size inches Spanner size MM 5/16 inch 1/2 inch 12.7 mm 3/8 inch 9/16 inch 14.29 mm 7/16 inch 5/8 inch 15.88 mm 11/16 inch 17.46 mm What does BA stand for on spanners? From Wikipedia, the free encyclopedia. British Association screw threads, or BA screw