This section provides an overview for gauge nuts as well as their applications and principles. Also, please take a look at the list of 10 gauge nut manufacturers and their company rankings.
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A gauge nut is a nut used to catch the rack mounting screws when mounting servers and telecommunications equipment to rack mounting rails. It is attached to a rack that has square holes for cage nuts. The screw size (screw diameter) used can be changed by changing the size of the cage nut. It uses a special tool or flat-blade screwdriver for installation.
Gauge nuts are used to set the screw mounts when mounting equipment on 19-inch racks, such as server racks, that do not have screw mounts on the rack itself. By hooking the tabs of the nut into the square holes in the rack's main pillar, screw holes with the required pitch and screw diameter can be obtained.
Since it is necessary to push the tabs into the backside of the pillar when installing the rack, a special tool for attaching and removing the cage nut is also available. If not available, a flat-blade screwdriver can be used, but be careful not to drop the nut or injure yourself.
To accommodate the different screw diameters (mainly 5 mm and 6 mm) used when mounting equipment in racks, 19-inch racks with rack posts that have square holes instead of round holes for screw receptacles (19-inch racks with 19-inch threaded spacing between posts for mounting equipment, as defined by the Electronic Industries Alliance (EIA)) are used. Alliance (Electronic Industries Alliance, EIA) uses standard racks with square holes instead of round holes. It consists of a square frame with claws for fixing nuts on the base material side and a screw holder (female screw) for receiving nuts (male screws) used for fastening devices. There are different nut heights with the same nominal diameter to match the thickness of the base material.
When in use, the claws on the nut surface are hooked into the square holes (9.6 x 9.6 mm) of the support column using a special removal tool or a flat-blade screwdriver to secure it in place. Screws to be used in combination are those for cage nuts, and the nut and screw diameter should be matched (M5 and M6 are common nominal diameters).
*Including some distributors, etc.
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