5-101.bk Page 20 Friday, March 17, 2006 11:05 AM METRIC MISMATCH Certain metric/English fastener thread combinations are incompatible and may result in mismatch conditions. These conditions can cause thread stripping and/or assembly weaknesses which may lead to service failure, rendering a vehicle inoperative or unsafe for operation. Inch Thread vs. Metric Thread Fastener Combinations Contributing to Thread Stripping The following inch/metric screw and nut (or tapped hole) combinations can be finger started (at least two full turns), but will strip if fully assembled.
*Fine thread *Fine thread Page 2-20 200 SPECIFICATIONS Inch Nuts Metric Screws 5-40 M3 x 0.5 1/4-20 M6 x 1.0 *1/4-28 M6 x 1.0 *5/16-24 *M8 x 1.0 7/16-14 M10 x 1.5 7/16-14 *M10 x 1.25 7/16-14 *M10 x 1.0 1/2-13 M12 x 1.75 *1/2-20 M12 x 1.75 1/2-13 *M12 x 1.5 *1/2-20 *M12 x 1.5 1/2-13 *M12 x 1.25 9/16-12 M14 x 2 *9/16-18 *M14 x 1.5 *5/18-18 *M16 x 1.5 1-8 *M24 x 2 Inch Screws Metric Nuts 4-40 M3 x 0.5 5/16-18 M8 x 1.25 *5/16-24 M8 x 1.25 3/8-16 *M10 x 1.25 *3/8-24 *M10 x 1.25 M10 x 1.5 *M10 x 1.0 7/16-14 *M12 x 1.25 *7/16-20 M12 x 1.75 *M10 x 1.25 *1/2-20 M14 x 2 *5/8-18 *M16 x 1.5 *7/8-14 M24 x 3 *1-12 M27 x 3