Imperial USA ED-SB1024 1-3/4" Sex Nut and Bolt for Exit Devices

A sex nut and bolt is the through-bolt pair that clamps an exit device chassis to the door: the barrel (nut) passes through from one face, the screw threads into it from the other, and the two draw together so the device is held by the door itself rather than by screws biting into a thin skin. The Imperial USA ED-SB1024 is that fastener set for panic hardware, sized 1-3/4 inch. You need one any time you are mounting or remounting a panic device on a hollow metal or wood door and the original through-bolts are missing, stripped, or the wrong length.

That is exactly what it is sized for. The ED-SB1024 is the 1-3/4 inch sex nut and bolt, which is the standard commercial door thickness, so it suits typical hollow metal and commercial wood openings. On a thinner 1-3/8 inch door or a thicker door with an added skin or armor plate, the bolt length no longer matches and you want the length that corresponds to that thickness instead.

Yes, and this is the usual reason people buy them loose. Sex bolts carry the whole load of a panic device, and once the internal threads in the barrel are chewed up or the barrel spins in the hole they will not draw tight again. Replacing the pair with the ED-SB1024 at 1-3/4 inch restores the clamp on a standard commercial door without redrilling anything, since the new set uses the same through-holes.

Order by the count of mounting points on your device, not by the door. A panic device is through-bolted at several points along the chassis and the end case, so a single bar typically takes more than one set. Count the through-holes on the device you are mounting and buy that many ED-SB1024 sets so you are not short mid-install.

It is a commercial-duty part, sold as door hardware for panic device installation rather than as a residential fastener. If you are outfitting exit doors in a school, hospital, retail space, or multi-family building, this is the through-bolt class the device mounting was intended to use.

Aluminum, finish code AL, and that is the only finish offered. On the exposed face of a panic device the bolt head sits flush against the chassis, so an aluminum head reads cleanly against aluminum and clear-anodized devices and stays unobtrusive against darker hardware.