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Tool Talk Discussion Forum

Cap Screw and Bolt???

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Robert in Md

12-03-2005 19:47:32

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Just curious, whats the difference between a cap screw and a bolt?

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John Garner

12-04-2005 10:18:34

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The difference? Simple . . . in reply to Robert in Md, 12-03-2005 19:47:32

Robert --

In the Mechanical Engineering world, a bolt is a headed fastener that takes a nut whereas a screw is a threaded fastener that directly engages internal threads in a larger part that has some function other than simply holding a bolt in place.

John

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Jim K

12-04-2005 07:55:43

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Re: Cap Screw and Bolt??? in reply to Robert in Md, 12-03-2005 19:47:32

I always thought that a hex cap screw was an Allen Head bolt.

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JMS/MN

12-04-2005 16:12:51

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Re: Cap Screw and Bolt??? in reply to Jim K, 12-04-2005 07:55:43

I've always referred to an Allen head bolt as a hollow head cap screw, and a hex head would be referring to a bolt with six flat surfaces on the outside of the head, unlike that of a carriage bolt.

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Rod (NH)

12-03-2005 20:36:08

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Re: Cap Screw and Bolt??? in reply to Robert in Md, 12-03-2005 19:47:32

Hi Robert,

A cap screw is a bolt with a more carefully controlled body diameter. The body is that area between the end of the threaded area and the bottom of the head. For example, a hex head bolt of 1/4" nominal size has a body diameter of 0.260" maximum. A hex head cap screw of the same 1/4" nominal size has a body diameter within the limits of 0.250" maximum and 0.245" minimum. This is from ANSI B18.2.1, Square and Hex Head Bolts and Screws, Inch Series. A cap screw will typically have a fully machined unthreaded shank where the bolt will have an unthreaded shank that is in the as-rolled condition. Hex cap screws are sometimes called "finished hex bolts".

Rod

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jerrycpp

12-06-2005 12:04:19

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Re: Cap Screw and Bolt??? in reply to Rod (NH), 12-03-2005 20:36:08

For special applications such as mounting clutch pressure plates, we had what were called "body fit" bolts. The unthreaded part was a bit larger diameter than the threads. Are these the same thing?

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