3102-250 – Flange Yokes – 1310 Series – Bolt Circle Dia 3.850″ – Pilot Dia 2.250, M

Selecting the Right Flange Yoke -- 3102-250 for 1310 Series

Flange yoke selection starts with two numbers: bolt circle diameter and pilot diameter. Get either wrong and the part will not fit. The 3102-250 targets companion flanges with a 3.850" bolt circle and a 2.250" male (raised) pilot, which covers a significant slice of North American and import truck platforms running 1310 series driveshafts. If your vehicle fits this profile, the 3102-250 is a direct bolt-on with no modification needed.

Full Specification Table

Understanding 1310 Series Compatibility

The 1310 series designation refers to the u-joint cross cap diameter and load rating. Mixing series at the flange creates a weak link that will fail under the torque the upstream components can generate. The 3102-250 is a native 1310 series design, meaning the ear bore matches 1310 cross dimensions and the strength grade is appropriate for the rated output of 1310 series u-joints. Do not attempt to adapt a lower-series yoke onto a 1310 series driveshaft -- the ear bore will be too small or the material grade too soft.

Key Fit Points to Verify Before Ordering

• Bolt circle on companion flange: 3.850" (measure, do not estimate)
• Number of bolt holes: 6
• Bolt hole diameter: 0.320"
• Pilot diameter: 2.250" male (raised) pilot
• CJ-to-flat dimension: 2.670"

Universal Driveshafts ships the 3102-250 in protective packaging to prevent surface damage to the machined pilot and flange face in transit. Inspect on arrival and contact our team immediately if any dimensional concern is identified before installation.