ASME B18.12 pdf download

ASME B18.12 pdf download.Glossary of Terms for Mechanical Fasteners.
2.1.4 Headed Fastener
headed fastener: a fastener that is enlarged or formed at one end.
2.1.5 HeadLess Fastener
headless fastener: a fastener, either threaded or unthreaded, that is not enlarged at either end.
2.1.6 HIgh-Strength Fastener
high-st rength fastener: a fastener whose high tensile and shear strengths are attained through a combination of materials, work-hardening, and heat treatment. These fasteners usually have a tensile strength in excess of 120.000 psi.
2.1.7 Lock Pin and CoLLar
lock pin and collar: a headed and externally grooved mechanical device designed for insertion through holes in assembled parts. A cylindrical collar Is swaged into the external groove as the lock pin is hydraulically tensioned. Collars either are smooth bored or contain a fit-tab. An optional flange provides a built-in washer.
2.1.8 MechanicaL Properties
mechanical properties: the properties of a fastener in reaction to applied loads. The mechanical properties of the fastener are rarely those of the raw material from which It was made. Properties such as tensile and yield strengths, hardness, and ductility will vary widely depending on the choice of manufacturing methods and metallurgical treatments.
2.1.9 Modified Standard
modified standard: a standard part that has one or more of its features or characteristics slightly changed. Such a part is typically customized to a customer’s specs for a particular application, but the change is such that any interested manufacturer can produce the modified part.
2.1.10 Nonstandard Fastener or Special Fastener
nonstandard fastener or special fastener: a fastener that differs in size, length, configuration, material, or finish from established and published standards.
2.1.11 Physical Properties
physical properties: inherent properties In the raw material that remain unchanged or undergo only slight alteration In the fastener following manufacture. These properties may include density. thermal conductivity, and magnetic susceptibility.
2.1.12 Part Identifying Number (PIN)
Part Identifring Number (PIN): a 21 -character code that identifies an ASM E B I 8-manufactured product by specific characteristic fields, such as fastener family identification, ASME B18 standard Identification, fastener style or type, thread series, nominal diameter, nominal length or dimensional/other characteristics, material and treatment, plating, coating, passivation, and special features relevant to the fastener product.
2.1.13 PrecIsion Fastener
precision fastener: a fastener manufactured to close dimensional and geometric tolerances.
2.1.14 Proof Load
proof load: the tensile load that a fastener must support without evidence of permanent deformation. Proof load Is an absolute value, not a maximum or minimum value For most carbon or alloy steel fastener strength grades or property classes, proof’ loads are established at approximately 90% to 93% of the expected minimum yield strength. Proof loads are frequently used as design values in joint analysis and fastener selection.
2.1.15 Proof Test
proof test: a form of tensile test in which the maximum load applied is the proof load value in the applicable specification.
2.1.28 Torque
Torque: the tendency of a force to rotate an object about Its axis, The magnitude of the torque Is the applied force multiplied by the distance from the rotational axis (often referred to as the lever arm). Since there is a relationship between torque and tension, torque is often used to achieve a desired axial load (preload) in a fastener. It is typically expressed In foot-pounds (ft-lb) and inch-pounds (ln.-lb) (U.S. Customary) or newton-meters (N m) (SI).
2.2 Fastener Characteristics (ExcLuding Head StyLes)
2.2.1 Bearing Face
bearing face: the load-carrying surface. Examples include the underside of a bolt head, the washer face on a nut, and the surface of a fastener that Is in contact with the joint surface.