RHPBSB150DUHP4Ball Screw Support Bearing Matched Duplex Pair 1-1/2 in x 72 mm x 5/8 in 60 Degree Contact Angle Heavy Preload

Product Description

What this part is:

A matched duplex pair of RHP BSB150 ball screw support bearings, 1-1/2 in bore, 72 mm outside diameter, 5/8 in wide each, ground to heavy preload. Ball screw support bearings are a distinct family built to take the axial thrust of a screw with very little radial duty. Bore Diameter: 1-1/2 in (38.10 mm). Outside Diameter: 72 mm. Width: 5/8 in each. Contact Angle: 60°. Preload: Heavy. Rolling Elements: Steel balls. Country of Origin: United Kingdom.

Decoding the designation:

BSB — RHP ball screw support bearing series.

150 — 1-1/2 in bore.

DU — ground duplex set, two bearings matched for universal pairing.

H — heavy preload.

P4 — ABEC 7 precision.

38TAC72 — NSK number for the 60° TAC family, 72 mm outside diameter.

What these specs mean in practice:

A 60° contact angle is far steeper than the 15° to 40° range of ordinary angular contact bearings. Nearly the whole load path runs along the shaft axis, giving very high axial stiffness and thrust capacity with very little radial capacity — the duty of a ball screw end support, where a separate journal takes radial load. Heavy preload raises axial stiffness further, which holds positioning accuracy on a feed axis under reversing load.

Quantity and configuration:

Unit Quantity: 2 Pcs, supplied as one matched duplex set. The rings are ground together so the pair reaches the specified heavy preload with the rings clamped solid. Each bearing is 5/8 in wide and the pair stacks to 1-1/4 in. Each bearing takes thrust in one direction; mounted back-to-back or face-to-face the pair takes thrust in both directions, and in tandem it takes a larger load in one direction.

Interchange guidance:

Cross-Reference: NSK 38TAC72 (related, 38.00 mm metric bore, family and angle reference). Cross-Reference: Fafnir MM9310WI2 (related). Bore is inch: 1-1/2 in is 38.10 mm. Ordinary 7000- and 7200-series angular contact bearings of similar section have a shallower angle and different axial stiffness. Light and medium preload versions of BSB150 are separate parts.

Frequently asked questions:

What contact angle does the BSB150DUHP4 have?

60°.

What preload does it have?

Heavy preload, ground duplex set.

What precision class is P4?

ABEC 7.