1302-17 – Flange Yokes – 1351-21 Series – Bolt Circle Dia 3.575″ – Pilot Dia 1.811, M

Production-Grade 1351-21 Series Flange Yoke -- Part 1302-17

Custom driveshaft builders and OEM repair technicians share the same requirement: a flange yoke that matches the companion flange exactly and survives the duty cycle of the vehicle. The 1302-17 meets both criteria. Produced in 1351-21 series geometry with a 3.575" bolt circle and 1.811" male (raised) pilot, it fits the companion flanges found on a wide range of trucks, SUVs, and performance vehicles without secondary machining or shimming.

Technical Specifications

Companion Flange Compatibility Logic

A companion flange is defined by four measurements: bolt circle diameter, bolt hole count, bolt hole diameter, and pilot bore diameter. The 1302-17 is designed around 3.575" BCD, 4 holes at 0.450", and a 1.811" male (raised) pilot. If all four of your companion flange dimensions match these values, the 1302-17 installs without modification. Cross-reference your existing yoke or the companion flange directly -- do not rely on vehicle year/make/model alone, as suppliers changed flange specs during production runs.

Step-by-Step Fit Verification

• Measure the bolt circle diameter on your companion flange -- needs to be 3.575"
• Count and measure bolt holes -- 4 holes at 0.450"
• Measure pilot bore -- must accept 1.811" male (raised) pilot
• Confirm 1351-21 series u-joint is already installed or on order for the same build
• Verify CJ-to-flat (1.688") will not cause cross interference with companion flange recess

Universal Driveshafts has stocked the 1302-17 as a catalog item because the 3.575" bolt circle, 1351-21 series configuration is a common spec across numerous platforms. Order with confidence -- this part ships from stock.