DIN ISO 6698:2014-02

This International Standard specifies the thread profile and limits and tolerances for the screw threads used to assemble freewheels on bicycle hubs. It is based on a) the used of the ISO basic thread profile given in ISO 68; b) satisfactory interchangeability with the corresponding British Standard Cycle (B.S.C.) thread; this has required the use of an inch pitch (t.p.i.); c) the use of screw tolerance grades and tolerance positions given in ISO 9651; the use of gauges made to ISO 1502.