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Old 06-28-2010, 05:31 PM
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Regular everyday "bolts" are usually referred to in hardware catalogs as "cap screws"

There are also "machine screws" that have slotted, phillips, (or here in Canada ... "Robertson" square hole socket heads.)

#6 to #14 sizes are common, with various thread pitches depending on diameter (eg. 10-24, 10-32 TPI)
#12 = 3/16"
#14 = 1/4"

So perhaps Brian's 1/4" - 24 could have easily been a fine thread "machine screw" as opposed to a "cap screw"?

There are "standards" when it comes to fasteners. The ASME (American Society of Mechanical Engineers) provides one set of standards ... but I recall reading somewhere that fastener specs may be in a state of transition ... or that there may be a somewhat paralell standard in place, depending on geography?
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