2-4-433 End Yoke – Round Bore 1310 Series, 0.750 Bore KEYWAY: 0.188 , Hub Diameter: 2.125

2-4-433 Dana Spicer 1310 Series End Yoke — Round Bore, 0.750" Bore with 0.188" Keyway at 12 O'Clock

The 2-4-433 is a Dana Spicer 1310 Series round-bore PTO-style end yoke with a 0.750" bore diameter and a 0.188" keyway. This is a full-round, outboard end yoke used where the mating shaft uses a key-and-bore retention method rather than an involute spline. The hub diameter of 2.125" defines the seating surface against the equipment housing bore. A critical installation note catalogued for this part: the keyway is located at the 12 o'clock position, meaning the slot is oriented at the top of the bore relative to the yoke ears.

The 2-4-433 accepts 1310 Series U-joint caps, which measure 1.062" in diameter. The CJ-to-end dimension of 2.562" establishes the U-joint centerline to bore end distance for driveshaft length calculations. This yoke uses RB (Round Bore) style — there are no spline grooves, only the smooth round bore with a single keyway cut. The keyway width of 0.188" corresponds to a 3/16" key; verify that the mating shaft uses exactly this key width. Installing this yoke with a 0.250" key will cause the bore to split or distort the keyway walls under torque.

Specifications

• Part Number: 2-4-433
• Brand: Dana Spicer
• Series: 1310
• Bore Type: Round Bore (RB)
• Bore Diameter: 0.750"
• Keyway Width: 0.188"
• Keyway Location: 12 o'clock (top of bore)
• Hub Diameter: 2.125"
• CJ to End: 2.562"
• Style: RB (Round Bore)

Fitment & Installation Notes

Before ordering the 2-4-433, measure the shaft diameter at the yoke mounting location — it must be exactly 0.750". Then verify the key on the shaft is 3/16" (0.188") wide. The keyway-at-12-o'clock orientation means the key must align to the top of the bore when the yoke is oriented with U-joint ears horizontal. If the equipment design places the key at a different clock position, this yoke will require a custom shimming arrangement or a different part. The 1310 Series rating means U-joint caps are 1.062" diameter — confirm this matches the U-joint used at the opposite end of the shaft.

The 1310 Series is found across a wide range of agricultural PTO equipment, light industrial drives, and vehicle driveshaft applications. The round-bore design is common on implements where the output stub uses a machined keyway rather than an involute spline, such as certain tractor PTO shafts, pump drives, and auxiliary equipment connections. The 1310 Series U-joint cap (1.062") is the same diameter as the 1330 Series, but 1330 yokes have wider ears — the 2-4-433 ear span is cut to 1310 dimensions (3.219" width). Substituting a 1330 U-joint will not fit correctly in the 2-4-433 ears.

The 2-4-433 is a Dana Spicer catalogued part for 0.750" round-bore PTO end yoke applications in the 1310 Series. When verifying cross-references, confirm bore diameter (0.750"), keyway width (0.188"), hub diameter (2.125"), and keyway position (12 o'clock) against the driven shaft specifications. Explore related End Yoke components including splined-bore 1310 variants and larger-bore round-bore yokes for other PTO shaft configurations.