PTO Output Shaft | Tractor Splined PTO Stub Shaft Replacement

A PTO output shaft, or PTO stub shaft, is a solid splined core shaft installed on the rear side of the tractor transmission. It acts as the power interface that engages and drives your PTO driveline. Unlike complete PTO drivelines equipped with universal joints, this is a standalone single spline shaft built for power transfer inside the tractor’s PTO assembly.

We follow ASAE standard imperial spline sizes designed for the North American market. The 1‑3/8" 6 spline variant runs at 540 RPM and works well for light and medium tractors under 65HP. The 1‑3/8" 21 spline option supports 1000 RPM for mid-range tractors that require higher torque, while the 1‑3/4" 20 spline version is the heavy-duty choice for tractors above 110HP.

Manufactured from premium forged alloy steel, each shaft undergoes carburizing and quenching heat treatment. This process hardens the spline surfaces to resist spline stripping and abrasion, even under sustained heavy torque in dusty and muddy farm working conditions. Every spline is machined with high precision and tight tolerance control, which guarantees smooth meshing with matching PTO yokes and drivelines without sticking or binding during operation. The finished shaft is carefully machined for balanced rotation to maintain consistent, smooth power output at the rated speed and reduce vibration.

This splined PTO shaft is compatible with mainstream farm tractor platforms widely used across North America, including Case IH, John Deere, New Holland, Massey Ferguson and more. It fits well for constructing custom PTO power setups, overhauling tractor transmission PTO sections, stocking power transmission components for farm workshops, and configuring power systems for rotary cutters, balers, tillers and other farm implements.

The product is produced according to ASAE S331.7 standards, with rated working speed options of 540 RPM and 1000 RPM. Available imperial spline choices cover 1-3/8" 6 spline, 1-3/8" 21 spline and 1-3/4" 20 spline. Custom spline profiles and dimensions can be produced based on customer drawings. Each unit is packed separately in a kraft box as shown in the product photo.

When selecting the shaft, first confirm the working RPM of your tractor PTO system, either 540 RPM or 1000 RPM. Next, measure the outer diameter and count splines on your mating component to match the inch specification. It is critical to remember that shafts with identical outer diameter but different spline counts cannot intermesh.

Many buyers ask the difference between a PTO stub shaft and a PTO driveline. A PTO stub shaft is the compact splined core shaft fitted to the tractor gearbox. A PTO driveline is the longer connecting shaft with universal joints that links the tractor to farming implements. Our splined shafts only work when spline size, spline number and rated RPM fully match your PTO assembly. We accept custom manufacturing if you send your dimension drawings for special spline and size requirements. All spline dimensions comply with ASAE imperial standards for agricultural equipment used in the United States and Canada.