RHPBSB045100SUHP3Ball Screw Support Bearing — 45 mm ID, 100 mm OD, 20 mm Width, Open, 60° Contact Angle, Heavy Preload, P3 Precision

Product Description

What this part is

RHP BSB045100SUHP3 ball screw support bearing. Bore: 45 mm. Outside Diameter: 100 mm. Overall Width: 20 mm. Contact Angle: 60°. Preload: Heavy (H). Arrangement / Configuration: single universally faced bearing (SU). Precision Class: P3 — P4 dimensional accuracy with P2 running accuracy. Closure Type: Open, both faces. Bore Type: Straight. Rolling Elements: Ball. Number Of Rows: 1. Series: BSB, the RHP ball screw support range. Bearing Material: Chrome steel. The carton also carries 45TAC100 and BSB045100-T.

Decoding the designation

BSB — RHP’s ball screw support series.

045100 — a 45 mm bore and a 100 mm outside diameter.

SU — single universal, the ring faces ground so that any two pieces of the same designation reach the specified preload when clamped.

H — heavy preload.

P3 — RHP precision grade P3, which combines P4 dimensional accuracy with P2 running accuracy.

45TAC100 — the NSK number on the same carton, which fixes the contact angle at 60°.

What these specs mean in practice

A 60° contact angle is far steeper than the 15° to 40° range of ordinary angular contact bearings. It puts almost the whole load path along the shaft axis, which gives very high axial stiffness and thrust capacity — the duty a ball screw end support has, where the screw carries the feed force and a separate location takes the radial load. Heavy preload adds axial stiffness, which is what keeps positioning error and backlash-like deflection down on a feed axis. P3 running accuracy holds the screw end true, which is what the axis position repeats against.

Quantity and configuration

Unit Quantity: 1 Pc. A single universally faced bearing, open on both faces. The ground ring faces allow two pieces of the same designation to mount back-to-back, face-to-face or in tandem and reach the specified heavy preload with the rings clamped solid.

Thrust direction

A single-row bearing of this type carries thrust in one direction. A screw driven and braked in both directions uses a back-to-back pair, or a tandem stack per direction where the thrust is large.

Mounting data

The high shoulder on the outer ring sets the mounting orientation and is identified by the etched face marking. The rings clamp solid between the housing shoulder and the screw-end nut, so the squareness of both faces sets the achieved axial runout of the screw end.

Interchange guidance

NSK 45TAC100 in the same universal-single, heavy-preload form is the direct equivalent, and it is the number printed on this carton. FAG 7602045TVP and NTN 45BST100 are 60° screw support bearings on the same 45 x 100 x 20 mm section. Light and medium preload versions of the same number are separate parts, and a 7209 or 7309 angular contact bearing on a near envelope is a related size with a different angle, axial stiffness and thrust capacity.