Add a Definition
- B -
Backside Protrusion -
Protrusion of a fastener from the back of the work piece.May apply to protrusion either before or after installing the fastener.
Bearing Surface -
Load-carrying surface of a structural component. Examples: undersides of bolt heads, washer-faces on nuts, and the mating surfaces between them on the fastened or joined structure.
Bend Test -
A test for determining the relative ductility or toughness of metals. Accomplished by bending a specimen over a mandrel of given diameter through a specified angle.
A surface which is not at right angles to an adjoining surface.
Blind Application -
Structure with access from only one side, requiring fasteners that can be fully installed from the exposed side. See: Cherrylock, V-Bolt and Visu-Lok.
Blind Fasteners -
Fasteners which are capable of being installed from one side of the structure only.
A simple cylindrical fastener having an enlarged head at one end and external threads at the other. When installed through a hole and engaged with an internally threaded member, it develops clamping forces and contains the assembled structure.
Breakneck Groove or Breaknotch -
A feature of certain fasteners designed to fracture when a predetermined axial or torque load is applied. Generally used to control the clamping force (preload) of a fastener.
Breakway Torque -
Brinnell Hardness -
Permanent surface deformation of one component by another, resulting from compressive loading.
A tool with one or more cutting edges shaped to produce an internal or external feature by shearing. The broach is moved in a single axis relative to the work, and produces shapes not easily obtained by turning or other work methods.
Bucking Bar -
A uniquely shaped weight used as an impact reaction mass, at the end of a fastener opposite to the applied load, in forming an upset button on a rivet.
A raised edge or corner on a metal workpiece often resulting from a machining, forming, or driving/installation operation.