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set screw
In American English, a set screw is a screw that is used to secure an object, by pressure and/or friction, within or against another object, such as fixing a pulley or gear to a shaft. A set screw is normally used without a nut (which distinguishes it from a bolt), being screwed instead in a threaded hole drilled in only one of the two objects to be secured. A set screw is often headless and threaded along its entire length, so that it will sit entirely inside that hole; in which case it may be called a grub screw or blind screw.
Once fully and firmly screwed into the first object, the projecting tip of the set screw presses hard against the second object, acting like a clamp. The second object may have a machined detent (recess) to ensure that it cannot slide under the tip of the screw. On a shaft, this may be simply a flattened area. A set screw may have any type of drive, such as hex or square head, slot, or recessed --- cross (Phillips), hex (Allen), star (Torx), or square (Robertson).
In the UK, the term "set screw" or "setscrew" refers simply to a bolt which is fully threaded, with no smooth shank; called cap screw in the US.
Brand new Superlative Arms adjustable gas block. Never mounted or used. Cash; no trades.
.625" inside diameter
Set screw attachment method
Machined from 416 stainless steel with Melonite finish
Runs cleaner and cooler
Bleeds off excess gas to required pressure to run the bolt
Adjustment detent...