3-53-1551 – Stub Midship Shaft – 15/16 x 1.500 Splines – Bearing Dia 1.574″ – Butt Dia 2.844

3-53-1551 Midship Stub Shaft -- Bearing Journal 1.574", 15/16 x 1.500 Spline

The 3-53-1551 is a precision midship stub shaft for two-piece driveshaft assemblies requiring a center support bearing. Key specifications: bearing journal 1.574", spline configuration 15/16 x 1.500" (3.000" engagement length), butt diameter 2.844" for 3.000 OD tube, and a style of SLIP.

Dimensional Data

Center Support Bearing Selection

The 1.574" bearing journal diameter is the critical dimension for matching a center support bearing (CSB). Select a bearing with a bore ID that matches within tolerance -- typically H7/k6 for a press fit. An incorrect bore size will either score the journal on installation (bore too small) or allow the bearing to spin on the shaft in service (bore too large). Measure the journal with a micrometer before ordering the bearing.

Spline Interface: 15/16 x 1.500"

This stub shaft uses a 15/16 x 1.500" spline profile with 3.000" of engagement. The mating slip yoke or companion yoke must have a matching spline count and diameter. Verify the companion yoke spline spec before assembly. Grease the splines with NLGI 2 EP grease to prevent fretting corrosion.

Weld End & Assembly

The 2.844" butt end accepts 3.000 OD tube. Weld with balanced heat input, then verify runout at the bearing journal (TIR should be under 0.003" before pressing on the CSB). Press the CSB onto the journal using an inner-race driver -- never press on the outer race. Mount the CSB bracket and verify perpendicularity before tightening fasteners. Dynamic balance the completed shaft assembly.