Which item is described as something that holds components in place on a shaft, typically fully threaded and internally wrenched?

Which item is described as something that holds components in place on a shaft, typically fully threaded and internally wrenched?

• A. set screw
• B. bolt
• C. barrel
• D. cable terminals

Answer: (A)

To secure components on a shaft, you need a fastener that clamps directly onto the shaft without a protruding head. A set screw is designed for this role. It sits in a threaded hole in the hub or collar and, when tightened with an Allen wrench or other internal drive, presses directly against the shaft to lock the part in place. It’s typically fully threaded along its length, which lets it engage deeply and provide a strong, flush hold. This makes it ideal for securing pulleys, gears, or collars to a shaft. The other options don’t fit this purpose: bolts have external heads and usually require a nut, often protrude from the surface; a barrel and cable terminals serve different mechanical or electrical roles.

To secure components on a shaft, you need a fastener that clamps directly onto the shaft without a protruding head. A set screw is designed for this role. It sits in a threaded hole in the hub or collar and, when tightened with an Allen wrench or other internal drive, presses directly against the shaft to lock the part in place. It’s typically fully threaded along its length, which lets it engage deeply and provide a strong, flush hold. This makes it ideal for securing pulleys, gears, or collars to a shaft. The other options don’t fit this purpose: bolts have external heads and usually require a nut, often protrude from the surface; a barrel and cable terminals serve different mechanical or electrical roles.