NSK45TAC100ADBAngular Contact Thrust Ball Bearing for Ball Screw Support – 45 mm ID, 100 mm OD, 20 mm Width, Straight Bore, Open, Back-to-Back Matched Pair.

Product Description

What this part is

NSK 45TAC100ADB, an angular contact thrust ball bearing for ball screw support. Bore Diameter: 45 mm (1.7717 in). Outside Diameter: 100 mm (3.9370 in). Overall Width: 20 mm (0.7874 in). Rolling Elements: Ball. Number Of Rows: 1. Bore Type: Straight. Closure Type: Open. Bearing Material: Bearing steel. Series: TAC.

Decoding the designation

45TAC100 — NSK’s ball screw support angular contact thrust series. The leading number is the bore in millimetres and the number following TAC is the outside diameter in millimetres, so 45TAC100 is a 45 mm bore in a 100 mm outside diameter.

A — the first design generation within the TAC family.

DB — back-to-back pair. Two single-row bearings supplied as a matched set and mounted with their outer ring backs together.

What these specs mean in practice

Ball screw support bearings carry thrust along the screw axis and hold the screw in axial position under reversing load. The 45 mm bore seats on the screw journal and the 100 mm outside diameter locates in the support housing bore. Overall Width: 20 mm per bearing. A back-to-back pair sets the load lines diverging outward, which widens the effective bearing span and raises resistance to tilting moments on the screw end.

Quantity and configuration

Unit Quantity: 2 Pcs. Mounting Arrangement: Back-to-back (DB) matched pair.

Interchange guidance

Cross-Reference 1: Timken MM45BS100, the same 45 x 100 x 20 mm ball screw support envelope. Cross-Reference 2: FAG BSB45100-T, the same 45 x 100 x 20 mm ball screw support envelope. Both designations are carried on this part’s own carton marking.