Leaders in Lowering the Cost of Assembly

Steering Shaft

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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


A leading automobile manufacturer had undertaken a major campaign to reduce the manufacturing cost of a steering shaft assembly. One of his first cost reduction steps was to replace the two machine screws attaching the electrical system contact activator to the steering shaft column with two M6 x 18mm TAPTITE® screws. This eliminated a bothersome drilling and tapping operation. His next undertaking was a re-design to eliminate the threaded stud that protruded from the steering shaft. The steering wheel is then secured to the stud with a lock washer and nut. His studies showed that the manufacturing cost of the steering shaft would be significantly reduced were the threaded stud replaced by 10mm diameter screw, driven into a hole in the end of the shaft. As he was already using TRILOBULAR™ TAPTITE® screws to secure the contact activator to the shaft, he naturally considered a TRILOBULAR™ screw to attach the steering wheel itself.


We recommended an M10 x 20mm DUO-TAPTITE® CORFLEX®-‘I’ screw. The DUO-TAPTITE® design was used to give the best ratio between driving torque, seating torque and developed clamp load. The stabilizing threads at the tip of the DUO-TAPTITE® screw would greatly simplify the robotic assembly of this unit, planned for the near future. CORFLEX®-‘I’ metallurgy and heat treating were selected to give the greatest resistance to failure due to impact or thermal loads.

Customer Benefit

Of course, the superb resistance of the DUO-TAPTITE® screw to vibrational and torsional loosening eliminated the need of any lock washer or chemical locking compounds. Here, as so often before, the singular characteristics of the TRILOBULAR™ family of fasteners yielded a considerable savings in manufacturing costs through greater ease of assembly.