Bolt, 1/4in x 1/2in x 26tpi, zinc plated. CEI/BSCY cycle thread, flat head, set screw with thread all the way to the head. Norton AJS Matchless post late 1950s also9467; 9547; 9584; 9604; 882012342; 14455 - Norton upright gearbox adjuster pins; brake shoe retaining bolt; rear chainguard attachment pin; front mudguard stay attachment pin; toolbox frame attachment bolt