紧固件常见词汇用语.docVIP

? Allowance: An intentional difference between the material limits of mating parts, either in the minimum clearance or maximum interference between the parts. ? ? Angularity: The angle between the axes of two fastener surfaces. back to top ? Anvil: The part of an installation tool nose assembly used to swage the collar of a lockbolt fastener. Commonly known as a swaging anvil. ? Band Anneal: Induction heat treatment used on certain rivets and High-Strength Hexert? inserts. Bearing Surface: The area that carries load across the face of the material. ? Binding Head: One with a rounded top surface, slightly tapered sides and a flat bearing surface, a portion of which may be undercut adjacent to the shank. back to top Blind Fastener: A fastener that can be placed with access to only one side of an application. ? Blind Side: The side of the joint which cannot be accessed (e.g. the inside surface of a tubular or box section). ? ? Body: In blind fasteners, the portion of the rivet that expands into the parent material. In threaded fasteners, the unthreaded portion of the fastener under the head. back to top ? ? Body Diameter: The diameter of the unthreaded portion of a threaded shank. Bolt: An externally threaded fastener that requires a nut to secure the fastened joint. ? ? Boss: Protuberance on a plastic part designed to add strength and/or facilitate fastening or alignment. ? ? Bottom up: Rivet tool pointing up. ? Breaker Groove: A weakened groove in the stem or pin of a fastener allowing breakage at a pre-determined load. back to top ? Breakstem: A fastener which is installed by gripping and pulling the end of the mandrel/stem. As installation is completed, the end of the stem fractures at the breaker groove and is discarded, leaving the head of the stem in the fastener body. View Flash animation of breakstem fastener placement ? ? Broach (with reference to Avdel? Speed Fastening? System):The action