McGuire Glossary of Fastener Terminology

C - 9 terms

CHAMFER - An angle cut (typically 45 degrees) applied to an O.D. corner of a part to eliminate the sharp corner.

CLOSED END - 1) The term used in the blind threaded insert industry to describe an internal threaded insert with metal enclosing the end of the thread opposite the head. 2) In the self-clinching fastener industry this style of part is said to be blind or have blind thread. Closed end parts are used to prevent long screws from interfering with odther components or for protecting the mating threads from corrosive environments.

CLOSING - Term applied to the operation of deforming the threads of tyep FE/LC/LK/UL nuts to provide prevailing thread lock.

COINING - During this process, a technician places a piece of metal between a die and punch in a stamping machine, and then uses the tip of the punch to penetrate the material and bend it. This process is repeated to relieve internal stresses throughtout the component. When fixed, a coined material should not exhibit any spring-back effects.

CORRIGENDUM - A correction page after the standard is published

COUNTERSUNK HEAD - A style of blind threaded insert with an angle, typically 100 degrees included, on the shank side of the head. If a proper size countersunk is applied to the mounting hole, this style of part will be flush in the panel in the head side after installation.

CPVC (PLASTICS) - Chlorinating PVC results in a polymer that has all of PVC's good qualities, plus improved fire retardance, weatherability, a higher maxiumum working temperature and light-fastness.

CURLING - Curling is a technique wherein a hollow and circular roll is introduced to the component. The curl is stronger than the rest of the component and safer to handle.

CYLINDRICALLY CURVED - They offer the most uniform spring constant of any of the spring washer types.