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The application is fastening a steel, string trimmer deck to a cast aluminum motor. The current fastener, a 3/18-16 ES-FORM case hardened fastener, experienced premature failure in the field. The customer also did not have accurate control over their assembly torque.
TAPTITE 2000® SP CORFLEX®-N (through hardened) fasteners were used in place of the case hardened ES-FORM fasteners.
The thread forming to failure torque ratio obtained during testing (11:1), using TAPTITE 2000® SP CORFLEX®-N fasteners enabled the customer to set a reasonable assembly torque. Also, the use of CORFLEX®-N, through hardened fasteners into the cast aluminum motor eliminated the possibility of stress corrosion found when using case hardened fasteners into aluminum. All TAPTITE 2000® SP fasteners tested failed due to stripping of the internal nut threads.