1/4"-28, a fine machine thread, with a Philips drive head. It threads into the B562P conventional cylinder assembly, so an off-the-shelf 1/4-20 coarse screw from the hardware bin will not engage.

A B562P deadbolt mounts with a pair of through screws, so plan two of the B600-078 per lock. If you're standardizing across a property, check the actual door thickness opening by opening: only leaves over 1-3/4 inches up to 2-1/4 inches take this length. Mixed-thickness buildings need the standard screws for the 1-3/4 inch doors and these for the thicker ones.

It's specified for the B562P conventional cylinder, not an interchangeable core setup. If you're working with an SFIC deadbolt, the core and housing are a different assembly. For loose SFIC parts, ZenSupply stocks the GMS 6-pin and 7-pin small format cores un-combinated and the GMS Best SFIC straight mortise housing with a Yale cam.

Both problems show up on doors over 1-3/4 inches, and they're separate fixes. Length is handled by the B600-078 at 3-29/64 inches, which spans up to a 2-1/4 inch door. Gapping between the cylinder and the face is a spacer problem, and ZenSupply carries the GMS KIT-PART04 collars kit for that. Sorting the screw length doesn't take up a cylinder that's standing too far out.

No. The B600-078 is a Philips head machine mounting screw, 1/4"-28 x 3-29/64", used to secure a B562P conventional cylinder through doors over 1-3/4 inch up to 2-1/4 inch thick. The GMS KIT-PART04 is a collars kit and is a cylinder part rather than a through-door mounting fastener. A collar spaces and trims a cylinder at the face of the door; it does not thread through the door to hold the cylinder in place, so it does not take the place of the mounting screw on a thicker door.

The B600-078 is a fastener only - a 1/4"-28 x 3-29/64" Philips head machine mounting screw sized for a B562P conventional cylinder in a door over 1-3/4 inch up to 2-1/4 inch thick. When the cylinder itself is being changed, the item to order is a cylinder: the GMS IC6-26D is a 6-pin small format interchangeable core sold un-combinated without keys, pins, springs or caps, and the GMS IC7-26D is the 7-pin small format equivalent, also un-combinated. Those are keying components; the screw is what holds a conventional cylinder to the door once the correct cylinder is on hand.

They serve different parts of the assembly. The B600-078 is a 1/4"-28 x 3-29/64" Philips head machine mounting screw that fastens a B562P conventional cylinder on a door over 1-3/4 inch up to 2-1/4 inch thick. The GMS ICM7-ST is a Best SFIC straight mortise housing, 7-pin, with a Yale cam - a housing that accepts a small format core and threads into a mortise lock body. A buyer standardizing on small format cores needs the housing; a buyer keeping a conventional cylinder on a thicker door needs the longer mounting screw.