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Industrial Fastener Terms

Bearing Surface – The supporting part of the fastener through which the fastener is loaded.
 
Blind Fastener – A fastener accessible on only one side.
 
Blind Side – The point on a blind fastener that can not be accessed.
 
Body – Referring to blind fasteners, it is the part of the rivet that expands into the material. In reference to threaded fasteners, it is the part of the fastener that is not threaded and is located under the head.
 
Button Head – A head of a threaded fastener that has a low, rounded top surface and a bearing surface, which is large and flat.
 
Clench – The ability of a fastener to hold together previously separated materials.
 
Complete Hole Fill – A feature of fasteners that allows them to fill irregular, slotted, oversized or misaligned holes.
 
Concentricity – The condition in which two fastener surfaces share the same center.
 
Countersunk Head – A head that when installed will sit flush to the surface.
 
Creep – The permanent deformation of a fastener resulting from the application of stress and heat.
 
Eccentricity – The degree of difference between the centers of the surface of a fastener at different points.
 
Fatigue Strength – A fracture resistance ability of a fastener during subjection to stress variations.
 
Fillister Head – A head with a rounded top, cylindrical-shaped sides and a bearing surface that is flat.
 
Grip – The thickness of the assembled materials or parts for which the fastener was designed to secure.
 
Joint – The materials that the fastener connects together.
 
Lead Thread – A measurement indicating the length between the beginning of a thread and the point at which the thread reaches its fullest size.
 
Major Diameter – The widest point of a screw thread.
 
Minor Diameter – The narrowest point of a screw thread.
 
Pitch – The distance between two threads.
 
Shank – The part of the fastener body between the head and the threaded portion.
 
Spacers – Components designed to protect fragile materials at contact points between the material and the fastener.
 
Thread Cutting – The process of creating threads by cutting into the metal blank, as opposed to rolling.
 
Thread Rolling – A cold forming process involving the creation of threads through the plastic deformation of a metal blank. The process, which produces rolled threads that have higher strength and abrasion resistance than threads constructed through cutting, involves the application of pressure, which stretches the metal past its elastic limit into the required profile