Barden120HDLSuper-Precision Angular Contact Ball Bearing, Matched Duplex Pair – Straight Bore, 100 mm ID, 150 mm OD, 24 mm Width Each / 48 mm Pair, Open, 15° Contact Angle, Light Preload, P4S.

Product Description

What this part is

Barden 120HDL super-precision angular contact ball bearings, supplied as a factory matched duplex pair. Bore: 100 mm. Outside diameter: 150 mm. Width: 24 mm per bearing, 48 mm across the pair. Open, straight bore, chrome steel rings and balls.

Decoding the designation

120: Barden size code, 100 mm bore on the 150 mm outside diameter and 24 mm width envelope. H: 15° contact angle series. D: universally matchable duplex pair. L: light duplexing preload, 575 N.

What these specs mean in practice

Basic dynamic load rating: 79.9 kN (17,960 lbf) per bearing. Basic static load rating: 92.0 kN (20,690 lbf) per bearing. On this light section the static rating sits above the dynamic rating, which is the normal relationship here. A 15° contact angle runs faster and takes less thrust than a 25° angle of the same envelope, which suits high-speed spindle positions. Limiting speed: 10,000 r/min on grease and 15,000 r/min on oil. Axial rigidity in the light preload class: 123.5 N/µm.

Preload and matching

Light duplexing preload: 575 N. Axial breakaway load: 1,813 N. The pair is ground as a set at the factory, so the two bearings seat directly against one another and reach the rated preload as built. Precision class P4S, which is ABEC 7 dimensional accuracy with ABEC 9 running accuracy.

Quantity and configuration

Two bearings, one factory matched duplex pair, 48 mm total stack width.

Cage construction

One-piece phenolic halo cage. Phenolic runs quieter and lighter than brass at high speed and holds oil in the fabric, which suits sustained high-speed spindle duty.

Interchange guidance

The 120H envelope matches ISO 7020 at 100 x 150 x 24 mm. Same-envelope equivalents at 15°: 7020 CTP4 GA, Fafnir 2MM9120WI, SKF 7020 CD/P4A. Barden 2120H is a related size on the same envelope at a 25° contact angle. Searchable forms: 120HDL, 120 HDL, 120H-DL, 120HDL7020, 7020CTP4GA.