Plate Nut

A plate nut, also known as a nut plate, anchor nut or anchor plate, is a stamped sheet metal nut that is usually riveted to a workpiece. They have a long tube that is internally threaded and a plate with two clearance holes for rivets. The most popular versions have two lugs and they exist as fixed anchor nuts and as floating anchor nuts.

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Detailed Description for Plate Nut

Nut plates are intended for use in wing-body fairing joints to provide a high float fastener which will maintain preload while permitting joint movement. Two configurations of nut elements are used on the floating nut plate product line. Single counterbore configurations are typically used for standard sized bolts while a double counterbore configuration may be used with oversized bolts for repair or rework.

Preload is obtained and limited by drawing the shoulder of the nut element up to the surface of the movable member controlling the initial compression of the spring. With the bolt removed, the spring must hold the nut in any selected position within limits of the float to permit alignment of the nut and bolt.

The latter allows the nut to move slightly and so enlarges the positioning tolerances of the mounted parts. They were originally developed for the aerospace industry, but are now also common in automotive racing.  These nuts are made up of variety of soft and hard materials. The choice of material depends on environment to which nut is subjected. Soft materials like copper or brass are used when nut is used in electrical application. Hard materials are used when nut is subjected to high stress environment. Sometimes stainless steel or nickel plated nuts are used in order to increase corrosion resistance.

Locknut types are available, which utilize deformed threads or a nylon locking element, much like a nyloc nut. These locking plate nuts are used when the nut is subjected to constant changes in environment or to vibration. The nylon insert expands and stops vibrations of the nut and acts as a locking arrangement. Other types have a floating nut or replaceable locking elements. A typical U.S. military specification for plate nuts is MS21047.

 

Features and Benefits:

·         High float nut plate available in 0.1900" and 0.2500" nominal diameters.

·         Nut element material: A286 CRES or alloy steel.

·         Lightweight version.

·         Nut plate tensile strength is 700 lbs minimum.

·         Torque-out at 45 in-lbs min.

·         Self-locking torque deliver up to 25 cycles.

·         Nut radial minimum float for single counterbore 0.100" and double counterbore 0.150".

 

Applications:

·         Tunnelling Ground engineering

·         Radial bolting

·         Slope stabilization

·         Forepoling

·         Micro injection pile

·         Face stabilization

·         Temporary support anchor

·         Portal preparation

·         Soil nailing


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