N3-40-2512 Super Duty Solid Butt Fits Tube 2.500×0.120 Can Be Machined To Any Tube Size – HARDENED SPLINES 7.000″ End To Weld 8.876″

The N3-40-2512 midshaft stub is the center section of a two-piece driveshaft — it carries the center support bearing and bridges the front and rear shaft assemblies. Spline count, spline diameter, and butt diameter are all spec-specific. The N3-40-2512 midshaft stub won't fit a different tube OD or a different output shaft spline, and substituting a close-but-not-exact part will produce vibration that traces directly back to this component.

N3-40-2512 Midshaft Stub — Spline & Tube Dimensions

The N3-40-2512 midshaft stub specs: 16 x 1.500 spline | 7.700" spline length | 2.270" butt dia | 8.760" end-to-weld | fits 2.500X0.120 tube. SPLINE LENGTH 7 Inch - SOLID BUTT. The butt diameter determines how the stub seats in the driveshaft tube — too loose and the weld joint runs off-center. Spline length determines engagement depth on the output shaft; short engagement under high torque loads damages the shaft splines before the stub shows any sign of wear.

When replacing a midshaft stub, measure both the tube ID and the output shaft spline count before ordering. Check runout on the new N3-40-2512 midshaft stub before welding — a stub with more than 0.005" runout will never balance correctly regardless of how many weights you add.

Key Features

• Spline: 16 x 1.500 — verify against output shaft
• Spline length: 7.700" — full engagement required under load
• Butt dia: 2.270" — must seat concentrically in driveshaft tube
• End-to-weld: 8.760" — factors into total shaft length
• Tube fit: 2.500X0.120 — designed for this tube specification
• Brand: UDS
• Note: SPLINE LENGTH 7 Inch - SOLID BUTT

Specifications

• SKU: N3-40-2512
• Brand: UDS
• Spline: 16 x 1.500
• Spline Length: 7.700"
• Butt Dia: 2.270"
• End to Weld: 8.760"
• Tube Fit: 2.500X0.120
• Notes: SPLINE LENGTH 7 Inch - SOLID BUTT