1302-15 – Flange Yokes – 1351-20 Series – Bolt Circle Dia 3.340″ – Pilot Dia 1.811, M

Precision-Engineered 1351-20 Series Flange Yoke -- 1302-15

When your drivetrain demands an exact bolt-flange interface, the 1302-15 delivers. Built to 1351-20 series geometry, this forged-steel flange yoke presents a 4-bolt pattern on a 3.340" bolt circle with 0.410" bolt holes, making it the correct companion for factory and aftermarket differential flanges that share these dimensions. The 1.811" male (raised) pilot locates the yoke on center before the fasteners are even torqued, preventing runout from the start.

Dimensional Specifications

Why Bolt Circle and Pilot Diameter Matter

A mismatched bolt circle forces the fastener holes to carry the rotational load rather than the pilot register -- a recipe for fretting, loosening under vibration, and eventual failure. The 1302-15 is dimensioned so the 1.811" pilot bears the radial load while the 4 bolts handle the axial clamping. Result: the joint runs true, stays tight, and survives high-torque acceleration without movement between mating faces.

Installation Notes

• Inspect companion flange pilot bore before assembly -- diameter should match 1.811" within 0.001"
• Use grade-8 (or OEM-spec) fasteners through the 0.410" bolt holes
• Torque evenly in a cross pattern; do not fully tighten one bolt before moving to the next
• Verify CJ-to-flat dimension (1.750") is compatible with your u-joint cap depth
• Check for end play in the mating yoke ear -- 1351-20 series caps must seat fully

Fitment & Compatibility

The 1302-15 is suitable for any application running 1351-20 series u-joints where the companion flange presents a 3.340" bolt circle and a 1.811" pilot. Typical uses include light truck front and rear axles, transfer case outputs, and custom driveshaft builds requiring a direct bolt-on connection. Confirm all dimensions against your existing flange before ordering.