3502-221 – Flange Yokes – 1350 Series – Bolt Circle Dia 4.000″ – Pilot Dia 2.245, F

Production-Grade 1350 Series Flange Yoke -- Part 3502-221

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 3502-221 meets both criteria. Produced in 1350 series geometry with a 4.000" bolt circle and 2.245" female (recessed) 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 3502-221 is designed around 4.000" BCD, 4 holes at 0.400", and a 2.245" female (recessed) pilot. If all four of your companion flange dimensions match these values, the 3502-221 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 4.000"
• Count and measure bolt holes -- 4 holes at 0.400"
• Measure pilot bore -- must accept 2.245" female (recessed) pilot
• Confirm 1350 series u-joint is already installed or on order for the same build
• Verify CJ-to-flat (2.625") will not cause cross interference with companion flange recess

Universal Driveshafts has stocked the 3502-221 as a catalog item because the 4.000" bolt circle, 1350 series configuration is a common spec across numerous platforms. Order with confidence -- this part ships from stock.

Need help with fitment? See our flange yoke guide for bolt patterns, pilots, and measuring tips.