Definition

Noun: A type of fastener, specifically a screw, that features a hexagonal (six-sided) socket or hole in its head. It is designed to be driven (tightened or loosened) using a matching hexagonal key, commonly called an Allen key or Allen wrench.

Usage

The term "Allen screw" specifically refers to the screw itself. It is used to describe this particular type of fastener in contexts like manufacturing, engineering, DIY projects, and furniture assembly.

Examples

• You will need an Allen key to tighten the Allen screw that holds the bicycle handlebar in place.
• The assembly instructions specify that all joints should be secured with Allen screws.
• I stripped the head of the Allen screw by using the wrong size wrench.

Advanced Usage

• The term is often used generically, though "Allen" is technically a trademark. The more generic technical term is "socket head cap screw" or "socket screw."
• It is common to specify the size, such as "a 5mm Allen screw."

Variants and Related Words

• Allen key / Allen wrench (noun): The L-shaped hexagonal tool used to drive an Allen screw.
• Socket head cap screw (noun): A more formal or technical term for an Allen screw, often used for larger, high-strength versions.
• Hex socket screw (noun): Another descriptive term emphasizing the hexagonal ("hex") shape of the socket.

Synonyms

• Socket screw
• Hex socket screw
• Socket head cap screw (SHCS)

Related Phrases

• To drive an Allen screw: The action of tightening or loosening the screw using the appropriate key.
  • Example: Make sure you drive the Allen screw straight to avoid damaging the socket.

Noun

1. a screw with a hexagonal hole in the head