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Glossary

Burr
A burr is a rough edge on material such as metal after it has been cut or drilled.
Button
The term "button" is used in some industries to refer to an oval head stud which resembles a button.
Cam
The cam is the milled opening on the end of a stud. This opening is used to engage the receptacle and lock the stud in place via the detent in the cam.
Deburring
Deburring is the process of removing burrs from parts. In the DFCI Part numbers, parts that are deburred are indicated with a "D" in the part number. For example, a 2351-20-9D-C3Y is a 2351-20-9-C3Y that has been deburred.
Deflection
Deflection is the amount of movement of the receptacle spring when locked on to the stud. The stud is secured in place by the pressure of the spring in the cam. In order for the spring to ride over the cam to the locked position, the spring must be deflected (moved). The On-Line Product Selectors show this as "Deflection (min / max / actual)". "min" is the amount which must be moved in order for the lock to be secure. "max" is the amount which, if exceeded, would prevent the stud from locking on. "actual" is the amount of actual spring movement calculated based on the parameters provided.
Gap
The gap is a space between the panel and the support. This space may be occupied by a gasket or any interposing material, or it may be air space.
Panel
The panel is the surface on which the stud is located.
Retainer
The retainer is a part which is used to secure (retain) the stud in the panel to keep the stud from falling out of the hole.
Receptacle
The receptacle is a device to which the stud is locked to hold the panel closed.
SE
SE is used in the DFCI Part Numbers to indicate that the part is Self Ejecting.
Self Ejecting
Self Ejecting is the term used to describe a stud that is, when unlocked, raised above the panel by a spring located under it. The ejection will provide a visual indication that the stud is unlocked. It also holds the stud against the panel to ease the removal from and/or alignment with the support and its receptacle.
Stud
The stud is the main item which engages the receptacle and secures the panel to the support.
Support
The support is the surface to which the receptacle is mounted.
Undercut
The undercut is a part of the stud which is smaller in diameter than the stud shank. The undercut is located directly under the head. This decreased diameter is where the retainer fits to prevent the stud from coming out of the mounting hole.