Basic Specifications◎ External and internal diameters of Metric screw threads must meet the requirement of ISO 965-2:1998.
◎ External and internal diameters of British Standard screw threads must meet the requirement of ASME B1.1:2003.
◎ External threads of counterparts must meet the tolerance of 6g ring gauge. Internal threads of counterparts must meet the tolerance of 6H bolt gauge.
◎ For internal threaded counterpart (i.e. nuts), chamfer processing is necessary and it should not have any sharp burr.
◎Coating length should be at least 4 pitches long, and the coating design should be based on the actual locking position on the counterpart as well as common application.
◎ The design of self-locking torque is based on IFI specifications. Please consult us in advance for any special requirement.
Self-Locking Torque Inspection Specification
IFI stands for International Industrial Fasteners Institute, and IFI-524/ IFI-124 are the only globally recognized self-locking torque inspection specification for non-metallic self-locking material. IFI specifications are also the fundamental principles of self-locking specifications for other industries.