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Made in the USA

9/16-26 Female Spline, Weld On Coupler, fits 20:1 Stiletto Rack-n-Pinion

Sale price $42.99 USD

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Part # C42-403
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See dimensions and diagrams for each size.

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Weld on Steering Pinion Couplers

We offer two types of weldable splined couplers to achieve a proper and secure connection between a steering shaft or drive unit to the steering box for the 9/16-26 Spline (when a U-joint is not desired).

The splines in these couplers are precision broached to the correct size. We inspect and test fit each part 100% - we guarantee they will fit their intended purpose.

Note: Welding should always be performed by a qualified welder.


Split-Bolt Coupler:  Part # C42-354


Spline is correctly sized to fit the Stiletto Pro-box, Stiletto Gen 5 Small Box (C42-348 series), and Pinto OEM style rack.

The Split-Bolt design provides positive clamping on the splines, plus the added security of the bolt passing thru the retaining groove of the pinion. When space or weight savings is a primary concern, the Dual-Lock coupler is another option to consider.

Machined from 1018 mild steel


Dual-Lock Coupler:  Part # C42-403


Spline is correctly sized to fit the Stiletto Pro-Box, Stiletto Gen 5 Small Box (C42-348 series), and Pinto OEM style rack

The Dual-Lock coupler has two set screws with locking nuts offset 90 degrees from each other. This dual set screw design draws up the connection thereby eliminating the potential of undesirable lost motion with normal spline clearance. To prevent spline deformation the locking screws are positioned to locate in the external retaining groove of the pinion.

Machined from Chromoly steel (4130N)

Questions and Answers

Can I weld Mild Steel to Chromoly Steel?

Yes, it is a very common practice. Mild Steel and 4130N Chromoly Steel can be welded together using the proper welding process and the correct filler rod.

Do I need to normalize a component or chassis made of 4130N Chromoly Steel after welding?

Some applications may require normalizing while others may not. This is a complex topic and can't be adequately addressed in a short paragraph. Please call our tech team at 800-530-9494 to discuss your specific project.

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