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200 SPECIFICATIONS
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.
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
*Fine thread
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
*Fine thread
5-101.bk Page 20 Friday, March 17, 2006 11:05 AM
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