Thursday, January 12, 2012


Once a while I receive  questions about adding extra screw to the order or if screw  they can be purchased separately. Everything is fine until we start to discus head type and screw length.  Industry do not fallow  one standard and this confuse few people.
There is 3 common type screws .
 Socket head cap screw. Screw dimension (length) is measured under head. In sample above this is 1/4-20 SHCS 5/8 length 

 Flat head screw. Length size is specify  as full screw length . Screw above is 1/4 -20 tread and  3/4 length.
Button head socket screw. Screw size is measure again as distance under head. Sample above 1/4-20 and 5/8 length 

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