10-4-143 End Yoke – Round Bore 1000 Series, 1.125 Bore KEYWAY: 0.250 , Hub Diameter: 2.000

10-4-143 UDS 1000 Series PTO End Yoke — Round Bore, 1.125" Bore with 0.250" Keyway

The 10-4-143 is a 1000 Series round-bore end yoke designed for Power Take-Off (PTO) driveshaft applications. It mounts at the terminating end of a PTO shaft, connecting the rotating assembly to a driven implement or gearbox via a 1.125" round bore with a 0.250" keyway slot and set screw. The hub diameter of 2.25" seats against the housing bore of the receiving equipment. Cross-references include Neapco N2-4-143; this is also catalogued as a direct Dana Spicer equivalent part.

The bore retention method on the 10-4-143 uses ISR (Inside Snap Ring) U-joint cap retention, which means the snap ring groove is located inside the yoke ear bore rather than on the exterior face. When sourcing replacement 1000 Series U-joints for this yoke, confirm ISR retention compatibility. The through-hole dimension of 1.20" accommodates the retaining fastener hardware and defines the minimum bolt/shaft clearance through the yoke body. The CJ-to-end measurement of 2.50" establishes the distance from U-joint centerline to the end of the yoke — a critical dimension when calculating overall assembly length in PTO shaft builds or repairs.

Specifications

• Part Number: 10-4-143
• Brand: UDS
• Series: 1000
• Bore Type: Round
• Bore Diameter: 1.125"
• Keyway: 0.250" gap
• Hub Diameter: 2.25"
• CJ to End: 2.50"
• Through Hole: 1.20"
• Snap Ring Style: ISR (Inside Snap Ring)
• Splines: N/A (round bore)

Fitment & Installation Notes

Before installing the 10-4-143, verify the driven shaft or PTO output stub measures exactly 1.125" in diameter. The 0.250" keyway must align with the corresponding key on the mating shaft — this yoke does not have a locating feature beyond the key slot, so shaft-to-bore concentricity depends on dimensional accuracy. Hub diameter of 2.25" must clear the housing bore of the receiving equipment without binding. The 1000 Series is the lightest-duty classification in the PTO driveline hierarchy and is suited for agricultural and light industrial implements operating at moderate speeds and torque levels. Do not substitute a 1000 Series yoke into a higher-series application — the yoke ears are machined for smaller 1000 Series U-joint caps, which cannot accept the larger cap diameter of 1310 or higher series joints.

The 1000 Series sits at the lower end of the PTO driveshaft torque capacity range. It is catalogued for light agricultural machinery, small implements, and compact utility equipment where shaft speeds are high but transmitted torque is relatively low. If the application demands higher torque throughput or involves significant angularity, the 1310 Series is the next step up and uses the same 1.062" cap diameter as the 1310 road vehicle series. The ISR retention style on the 10-4-143 requires proper snap ring pliers for service — do not attempt to drive caps in or out without the correct tooling, as ISR grooves are easily damaged.

The 10-4-143 cross-references to Neapco N2-4-143 and is catalogued as equivalent to the Dana Spicer 10-4-143. When cross-referencing, confirm the bore diameter (1.125"), keyway width (0.250"), and hub diameter (2.25") match the mating shaft and housing — dimensional deviations as small as 0.005" in bore fit will affect keyway alignment and retention. Explore related End Yoke components including splined-bore variants and 1310 series PTO yokes for higher-torque applications.