Ultimate Tinsel Strength

The Perfect Lock Bolt is designed to have comparable axial strength to that of a generic single helix bolt of equal nominal diameter. Desired axial strength is achieved by conforming to the physical and chemical properties standardized in ISO 898-1 (M series bolts) and SAE J429 (UN series bolts). Ultimate Tinsel Strength (UTS) and Proof Load are determined and tested using the preferred method indicated in ASTM F606. Axial tinsel test results of the Perfect Lock Bolt can be reviewed by clicking the link below.

» Download the Test Results (PDF)



The PLB has been tested to assure that it will achieve the standardized Proof Load, for a respective size, as stated in ISO 898-1. The torque-tension relationship for the PLB is determined using testing in accordance with ISO 16047 and can be referenced at the link below.

» Download the ISO 16047 Test Report (PDF)


Resistance to Self-Loosening of Secured Bolted Joints

VM Test M12 3-21-14The technology of the Perfect Lock Bolt provides a mechanical lock that will resist self-loosening of securely bolted joints. The dual thread, dual helix, design provides this mechanical lock by hindering movement of the coarse nut (the coarse or primary nut provides the desired clamp force to the joint). When properly secured, using the PLB, a joint can retain a minimum of 88% of the clamp force created during installation. The simplistic design, the mechanical lock (opposed to locking due to friction or material deformation), and the ability to achieve clamp loads comparable to standard bolts make the PLB ideal for heavy-duty application where safety and preload retention are imperative. Applications that involve high levels of stress due to vibration can cause many bolted joints to fail, therefore, subjecting a bolted joint to intense, varying vibration, can provide an accurate assessment of a fasteners ability to retain a desired amount of clamping force. The graph shown here provides data recorded using the Vibrationmaster Junker test bench, this provides a display of the performance of the PLB in an intense vibration application, in accordance with test standard DIN 25201-B and emerging standard ISO/DIS 16130.


Vibration Testing Demo