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Question

Difficulty: EasyScrews

What type of heavy-duty fastener features coarse wood threads, a pointed tip, and a hexagonal head designed to be turned with a wrench or socket rather than a screwdriver?

Answer: lag screw / lag bolt / lag screws / lag bolts

Answer

Lag screw (or lag bolt)
A lag screw (commonly referred to as a lag bolt) is a heavy-duty wood fastener engineered with coarse threads, a pointed gimlet tip, and an external hexagonal head. The hex head allows significant tightening torque to be applied using a socket or box wrench, which is necessary when anchoring heavy structural timbers where standard screwdrivers would cam out or fail to provide adequate leverage.

Step-by-Step Solution

1
Analyze the physical and functional characteristics described in the question.
The fastener has a hexagonal external drive head, coarse tapered threads, and a pointed gimlet tip for penetrating wood.
Standard wood screws have slotted or recessed heads, while bolts have blunt ends with uniform machine threads.
2
Identify the standard shop terminology for this fastener category.
Lag screw (also widely known in trade practice as a lag bolt).
Lag screws are specifically designed to provide high clamping force in heavy timber construction using a wrench or socket driver.

Key Concept

Heavy-duty wood fasteners and thread configurations
Estimated Time:30s
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Topics

Screws

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