Definition

Noun: A lag bolt is a heavy-duty wood screw with a square or hexagonal head, designed to be driven into wood using a wrench, not a screwdriver. It is used for fastening heavy materials to wood where great strength and holding power are required.

Usage

A lag bolt is used to create a strong, permanent connection, typically in construction, woodworking, and framing. It is inserted by first drilling a pilot hole and then using a wrench to turn the bolt.

Examples

• Noun:
  • Secure the ledger board to the house frame using several large lag bolts.
  • The playground equipment was anchored to the ground with heavy lag bolts.
  • You'll need a socket wrench to tighten that lag bolt properly.

Advanced Usage

• "Lag bolt and washer": A common assembly where a flat washer is used under the head of the lag bolt to distribute the load and prevent the head from digging into the wood.
  • Always use a washer with your lag bolt to ensure a secure fit.

Variants and Related Words

• Lag screw: Another common name for a lag bolt, though "lag bolt" is more frequently used.
• Hex bolt: A bolt with a hexagonal head, but typically used with a nut, not necessarily for wood.
• Carriage bolt: A bolt with a smooth, rounded head and a square section under the head to prevent spinning, also used in wood.

Synonyms

• Lag screw: The direct synonym.
• Coach screw: A term used in some regions, particularly outside North America.

Noun

1. a heavy woodscrew with a square or hexagonal head that is driven in with a wrench