Allen bolt
Hexagonal socket screw
An Allen bolt is a bolt with a hexagonal socket in the head, tightened or loosened with an L-shaped Allen wrench rather than a standard screwdriver or socket.
Common in furniture assembly, bicycles, and machinery where a flush head or compact tool access is needed: The instructions called for an Allen bolt and the included wrench.
- socketHollow receiving cavity
- hex keySix-sided fastener driver
- wrenchTool for turning fasteners
- loosenReduce tension or grip
- tightenMake more secure
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