ASVAB · Fasteners and Hardware

What is the difference between a bolt and a screw?

Reviewed by Jordan Morley, Editorial Lead at 247SimpleTests. Written by the 247SimpleTests Editorial Team from the official source material cited on every question.

Correct answer

A bolt requires a nut to fasten; a screw threads directly into a material — though the distinction in modern usage is often about application rather than absolute design

A Screws are only for wood
B Bolts are larger; screws are smaller
C A bolt requires a nut to fasten; a screw threads directly into a material — though the distinction in modern usage is often about application rather than absolute design
D Bolts have hex heads; screws have flat heads

Why this is the answer

Technically, a BOLT is designed to be tightened by a nut on the opposite side — it clamps two parts together through holes. A SCREW is designed to thread directly into a material (wood, metal, plastic) without a separate nut. In practical shop use, these definitions blur — 'machine screw' often refers to what is technically a bolt when used with a nut. The key concept: bolt + nut = clamping joint; screw = threads into material directly.

Source: ASVAB SI, Fastener Types

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About this topic: Fasteners and Hardware

Fasteners and hardware questions cover screws, bolts, nuts, washers, nails, rivets and anchors, including thread types and when to use each. Expect questions on the difference between a wood screw, a machine screw and a lag bolt. This is one of 9 Shop Information questions on fasteners and hardware, each with a full explanation on a single study page.

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What is the difference between a bolt and a screw?

Why this is the answer

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About this topic: Fasteners and Hardware

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