Making Machine Price Truss Head Machine Bolt Screw

The standard head angle (conical bearing surface) of flat and oval head machine screws is 82°; flat heads are also available in 82° undercut and 100° versions. Use a matching (82° or 100°) countersink to create a countersunk recess (a beveled opening) for flat and oval heads. The body diameter of the countersink should be equal to or greater than the head diameter to ensure that a uniform bearing surface is created.