Kind'a sorta like: Why do we drive on a PARKWAY, yet we park on a DRIVEWAY?
DD
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A cap screw has has the same size threads all the way, It becomes a bolt when used with a nut.
8BA heads are held on with cap screws.
If it screws into a threaded hole in a casting it is a cap screw.
If the same fastener is used with a nut it becomes a bolt and nut.
To most mechanics they are all bolts,
Bill
Channel lock "type" pliersChannel lock is a brand name for tongue and groove pliers like Crescent is a brand name for an adjustable wrench.
Bill