Leaders in Lowering the Cost of Assembly

String Trimmer

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Automobile Underbody Drive Train Support
Door Lock Attachment
Engine Torque Reaction Struct Bracket
Fender Rail Application
Ford Europe - Front Suspension Attachment
Front Brake Line Bracket to Vehicle Frame
Front Seat Belt Assembly
Front Seat to Seat Track
Front Stabilizer Plate Attachment
Hub and Bearing Assembly
Rear Axle Assembly
Steering Shaft
Tail Gate Strut Support Attachment
V6 Engine Timing Belt Cover Attachment


Aluminum Heat Sink
Black & Decker Workmate Workbench
Cable TV Hardware
Clothes Washer / Clothes Dryer
Cookware Handle
Dishwasher Leg Leveling Assembly
Door Roller Adjusting Bracket
Faucet Stem Assembly
Hedge Trimmer Blade
Hewlett-Packard 7350 Printer
Indoor and Outdoor Bleachers
Paint Scraper – Handle to Blade Assembly
Refrigerator Handle
Relay Valve Assembly
String Trimmer
Two-Cycle Outboard Motor


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.

Customer Benefit

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.