RHPBSB150SUHP4Ball Screw Support Bearing – 1.5 in ID, 2.8346 in OD, 0.625 in Width, Open, 60° Contact Angle, Heavy Preload.

Product Description

What this part is:

RHP BSB150SUHP4 ball screw support bearing. Series: BSB. Base Number: BSB150. Bore / Shaft Size: 1-1/2 in (38.1 mm). Outside Diameter: 72 mm (2.8346 in). Overall Width: 5/8 in (15.875 mm). Number Of Rows: 1. Rolling Elements: Balls. Closure Type: Open. Bore Type: Straight.

Decoding the designation:

BSB — Contact Angle: 60°, set by the BSB ball screw support family.

SU — single universally ground, so any two bearings of the same designation stack directly against one another.

H — Preload: Heavy.

P4 — Precision Class: P4, equivalent to ABEC 7.

Searchable forms of the number: BSB150SUHP4, BSB-150-SUH-P4, BSB 150 SUH P4, BSB150 SUH P4.

What these specs mean in practice:

The 60° contact angle is what separates a ball screw support bearing from an ordinary angular contact bearing: the steep raceway puts almost the whole ball load along the shaft axis, giving high axial stiffness and holding a loaded ballscrew in position. Heavy preload raises axial stiffness further and tightens repeatable positioning, which is what a machine-tool feed screw is set up for. P4 tolerances hold running and axial runout close, so the screw stays concentric under load.

Quantity and configuration:

Unit Quantity: 1 Pc. Universally ground faces allow single, duplex or stacked mounting. Preloaded execution, so the bearing is supplied set rather than clearance-graded.

Interchange guidance:

NSK 38TAC72B is a 38 mm metric-bore ball screw support bearing at 60° with a 72 mm outside diameter. MPN Variants recorded on this part: BSB150 UH EP7, MM9310WI2, 38TAC72. The light-preload execution of the same bearing is a BSB150SULP4.