5/8-36 Female Spline, Weld On Coupler, fits 6.4:1, 10:1, 12:1, 15:1 Stiletto Rack-n-Pinion
See dimensions and diagrams for each size.
Weld on Steering Pinion Couplers
Part # C42-353-B
Spline is correctly sized to fit the Stiletto 5/8-36 spline pinion
Machined from 4130 N Chromoly
Part # C42-355
Spline is correctly sized to fit the Stiletto 5/8-36 spline pinion
Machined from 1018 mild steel
Part # C42-355-B
Spline is correctly sized to fit the Stiletto 5/8-36 spline pinion
Machined from 1018 mild steel
Part # C42-403-A
Spline is correctly sized to fit the Stiletto 5/8-36 spline pinion
Machined from 4130 N Chromoly
Part # C42-403-B
Spline is correctly sized to fit the Stiletto 5/8-36 spline pinion
Machined from 4130 N Chromoly
Stiletto Steering Spline is Unique
The pressure angle of the Stiletto 5/8-36 pinion spline is unique to Stiletto Steering. This proprietary spline design will not accept other manufacturers attempts to replicate the Stiletto 5/8-36 pinion spline, resulting in parts that they claim to fit Stiletto - but won't.
OEM automotive splined components that share the 5/8-36 spline callout also will not fit.
The splines in our couplers and U-joints are precision broached to the correct profile and size for the Stiletto 5/8-36 pinion spline. We inspect and test fit each part 100% - we guarantee they will fit their intended purpose.
We offer several types of weldable splined pinion couplers to achieve a proper and secure connection between a steering shaft or drive unit and the steering box when a U-joint is not desired.
Note: Welding should always be performed by a qualified welder.
What are the different Coupler types?
Split-Bolt Coupler:
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 or Straight coupler are other options to consider.
Dual-Lock Coupler:
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.
Straight Coupler:
This coupler has no built-in retention provision; the installer will need incorporate a security method of locking the coupler to the male pinion for the specific application.









