Flat head cap screws

What is the difference between a Flat Head Cap Screw and a Flathead SOCKET Cap Screw?

In the MSC catalog they look identical, and I am now holding on the phone with MSC, because the tech guy doesn't know the answer.

As always, TIA

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A flat head socket cap screw has a hex socket and is driven with a hex (Allen) wrench. Also, the head diameter is greater than for a given screw size with a slotted or Philips flat head.

Ned Simmons

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Ned Simmons

AFAIUI, a FCHS can have any kind of head (eg. a slot), whereas a FHSCS must have a socket head (eg. a hex socket for an Allen key).

Note that the length of flat head cap screws is measured from the top of the head, unlike socket head cap screws where it's measured from behind the head.

Best regards, Spehro Pefhany

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Spehro Pefhany

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