McGuire Glossary of Fastener Terminology

R - 9 terms

RAISED RING ANVIL - An anvil with a protruding lip used to cold flow panel material into a self-clinching fastener from the opposite side it is installed.

REFLOW OVEN - Oven that melts the solder and adheres the product to the PCB and allows for set temperatures within different zones.

REVISION - A standard that has been reviewed and revised

RIBBED SHANK - A style of insert with a knurl on the shank OD. The knurls are typically aligned with the long axis of the part and begin just under the head and extend toward the thread. Knurl length is typically equal to the counterbore length.

RIVET NUT - A rivet nut, also known as a blind rivet nut or threaded insert. It is a one-piece internally threaded and counterbored tubular rivet that can be anchored entirely from one side. There are two types: one is designed to form a bulge on the back side of the panel as a screw is thightened in it threads. The other is similary drawn in using a screw, but is drawn into the sleve instead of creating a bulge.

ROLL OUT - The large diameter created by driving an undercut blade into the step of a stud during the thread rolling operation.

ROLL OVER - Term applied to the portion of a type R retainer opposite the shank end. Gets its name from the fact that during assembly this portion of the part is rolled over to captivate the insert.

ROOT - 1. The smallest diameter created by driving an undercut blade into the step of a stud during the thread roll operation. 2.) That surface of the thread that joins the flanks of adjacent thread forms and is immediately adjacent to the base from which the thread projects. For exteranal thread the root is at the minor diameter. For internal thread the root is at the major diameter.

RP - Recommended Practice