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  CAPTIVE NUTS :::
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Definition

Captive or self-retained nuts provide a permanent strong, multiple-threaded fastener in many types of thin materials. They are especially good in blind locations and can generally be attaching these types of nuts vary, and tools required for assembly are generally uncomplicated and inexpensive. Self-retained nuts are grouped according to four means of attachment. 
Plate or anchor nuts have mounting lugs which can be riveted, welded, or screwed to the part. 

Caged nuts use a spring-steel cage that retains a standard nut that snaps into a hole or clips over an edge to hold the nut position. 

Clinch nuts are specially designed nuts with pilot collar which are clinched or staked into the parent part through a precut hole.

Self-piercing nuts are a form of clinch nut that cuts its own hole.

ANCHOR-CAGED-CLINCH-PIERCE

CLINCH
 
Nut pressed into round hole and held by flow of metal into annular- ringed locking groove. Teeth dig into work piece to prevent nut rotation.   Square nut has round back tapered pilot collar which is pressed into round hole. Projections are corners embed in work piece to prevent nut rotation. 
 
Round pilot collar for round hole in work piece. Knurls on collar bite into wall of pilot hole to prevent nut rotation.    Nut pressed into round hole and held in place by metal flow into undercut pilot collar. Serrations on collar bite into wall to prevent nut rotation
 
D-shaped collar and nut installed in D-shaped hole to prevent rotation. Nut can be clinched or staked.    Hex pilot collar used in hex hole to prevent nut rotation. Collar can be clinched tight, or staked to allow for slight movement of nut. 

CAGED

Cage-type nut retainer used to secure standard square nuts to sheet-metal panels and other assembly components.

It consists of loose box like retainer over threaded nut. Two sides are open tabs bent over to retain the threaded nut; the other two sides extend underneath to form the panel engaging elements. 

The nut floats within the cage to compensate for assembly misalignment. 

 A self anchoring nut retainer. The nut is a special shouldered design and is locked in place when the retainer is assembled to the panel. The Side tabs engage the top pf the nut. 

This anchoring feature locks the fastener firmly in the panel hole and distributes driving torque to the surrounding area. 

The nut is rattleproof and even abusive handling cannot dislodge it. 

PIERCE


Typical pierce-nut installations: (a) Universal pierce nut with metal firmly coined into undercuts (b) high stress pierce nut used with thin metal (c) pierce nut with corners clinched against the work piece

ANCHOR

Single anchor stiffnut
Double anchor stiffnut

Floating anchor stiffnut		 These fasteners are produced in the types shown, being riveted to sheet metal structures. Largely used in the aircraft industry for instrument mounting. They are manufactured with standard types of stiff elements. 

 
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