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Socket Head Cap Screw Head Diameter?

Socket Head Cap Screw Head Diameter?

Socket Head Cap Screw Head Diameter?

(OP)
We are working on some old equipment that has some 5/8" socket head screws that need replacing.  We ordered new fasteners and the heads came in at the standard 0.938" diameter.  The old fasteners we are replacing have a head diameter that is approx. 0.860".  The counterbores in the part are sized accordingly so the new fasteners will not fit.

My question is, was there a change to the ANSI standards at some point to increase the head diameter or are these fasteners just non ANSI (i.e. produced in some non-ANSI abiding country)?  Is it possible to buy a 5/8" sockete head cap screw with a smaller head diameter anywhere?

RE: Socket Head Cap Screw Head Diameter?

Are you certain that they were not
16mm socket head capscrews?

RE: Socket Head Cap Screw Head Diameter?

(OP)
Positive.  According to my books a DIN 912 M16 fastener should  have a 24mm diameter head which would be 0.945".  The diameter of these heads is approx. 21.8mm.  It is definetly a 5/8-11 fastener.  Thanks anyway.

RE: Socket Head Cap Screw Head Diameter?

I've got a 14th edition of Machinery'd Handbook, and it appears to show the head diameter as a max of 7/8" and a min of 0.863".

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