TECHNICAL DATA 1. Difference in hardness: HHEICO > HMaterial BEFESTIGUNGSTECHNIK n The surface hardness of HEICO-LOCK wedge lock washers is greater than that of structural grade and high tensile bolts (8.8, 10.9,12.9) Steel (through-hardened) 485 ±25 HV0.3 Stainless steel (surface-hardened) > 520 HV0.05 2. Difference in angles: α > β n The wedge angle (α) between the HEICO-LOCK wedge lock washers is greater than the pitch (β) of the bolt thread n This angle means the expansion in thickness of the HEICO-LOCK wedge lock washers is greater than the possible longitudinal movement of the bolt along the thread 3. Difference in friction: µa > µi n The wedge-shaped surfaces have a considerably lower friction coefficient µi than the toothed outside of the washers (friction coefficient µa) n Loosening caused by dynamic stresses causes movement between the two washers in the region of the wedged surfaces 4. Difference in preload: Fdyn > Fstat n An expansion in thickness of the HEICO-LOCK wedge lock washers as a result of loosening leads to an increase in the clamping force n This causes an increase in the preload compared to when in a static state and thus causes the bolt to self-lock FIELDS OF APPLICATION Mechanical engineering Wind energy technology Automotive Agriculture and Railway forestry INSTALLATION EXAMPLES and many more Hexagon bolt in a through-hole, secured on both sides Hexagon bolt secured in a blind hole Countersunk secured cylinder bolt Secured stud bolt WWW.HEICO-LOCK.COM
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