An Allen bolt is defined as___________________?
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Answer: C. provided with hexagonal depression in head
Explanation
An Allen bolt or socket head cap screw features a recessed hexagonal socket in its head. An Allen wrench or hex key is inserted into this hexagonal depression to tighten the fastener. This recessed design allows fasteners to be installed flush in tight mechanical spaces. Socket head cap screws provide high clamping force and a clean aesthetic appearance. Hexagonal socket drives can transmit higher torque than traditional slotted or Phillips screw heads. Standard metric and imperial sizing applies to both Allen bolts and their matching wrenches.
Machinery assembly frequently utilizes Allen bolts because they fit into recessed counterbores easily. Automotive engines and industrial equipment rely on socket head screws for high-stress joints. Using the correct hex wrench prevents stripping the internal hexagonal depression in the bolt head. Option A describes a self-locking bolt, which features nylon patches or locking threads instead. Option B claims it is the same as a stud, which is a threaded rod without any bolt head. Option D mentions high-speed components, but fastener shape does not dictate rotational speed limits.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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