BardenAngular Contact Ball Bearing — 45 mm ID, 85 mm OD, 19 mm Width, 15° Contact Angle, ABEC 7 / P4S, Light Preload

Product Description

What this part is

The Barden 209HDL is a matched pair of super precision angular contact ball bearings from the Barden metric H spindle series. Each bearing measures 45 mm bore, 85 mm outside diameter and 19 mm width, with a 15° contact angle and ABEC 7 / P4S precision. The design is non-separable with a relieved outer ring and a one-piece phenolic halo cage, built for machine tool and grinding spindles.

Decoding the designation

209 — Barden base number in the 200 series; the last two digits (09) are the bore code, 45 mm bore.

H — Metric series spindle/turbine angular contact bearing, non-separable, relieved outer ring, with a reinforced one-piece phenolic halo cage.

D — Universal mounting: inner and outer rings of the same width, so the bearings install back-to-back (DB), face-to-face (DF) or tandem (DT).

L — Light preload. No numerals follow, which in Barden nomenclature denotes standard preload, 175 N for this size.

What these specs mean in practice

Bore Diameter: 45 mm. Outside Diameter: 85 mm. Overall Width: 19 mm per bearing. The envelope matches ISO 7209C-size bearings, so it fits shafts and housings machined for that size.

Contact Angle: 15°. The shallow angle favors high speed and radial stiffness over maximum thrust capacity.

Dynamic load rating: 35,377 N. Static load rating: 28,064 N. These per-bearing figures set fatigue life and the limit for permanent raceway deformation.

Limiting Speed: 17,000 rpm with grease; 25,000 rpm with oil. Oil lubrication raises the speed ceiling for high-speed spindles.

Preload: Light (L), 175 N standard preload. Barden’s range for this size is Light 175 N, Medium 440 N, Heavy 885 N; light preload balances spindle stiffness against heat generation.

Cage Material: Phenolic, one-piece halo, outer ring guided. The lightweight cage runs cool at spindle speeds.

Precision Class: ABEC 7 / P4S. Barden P4S means ABEC 7 nominal tolerances with ABEC 9 running accuracy, for low runout at the spindle nose.

Bearing Material: 100Cr6 (SAE 52100) chrome steel rings with steel balls. This is the standard through-hardened bearing steel for precision spindles.

Mounting data

Maximum fillet radius r1: 1.00 mm. Maximum fillet radius r2 on the non-thrust side: 0.50 mm.

Quantity and configuration

This listing is a universal duplex set of 2 bearings (D). Both bearings carry matched ring widths and the light standard preload, and the pair mounts DB, DF or DT.

Interchange guidance

Same envelope, 15° super precision equivalents: FAG B7209C.T.P4S, SKF 7209 CD/P4A, NSK 7209C P4 and Timken Fafnir 2MM209WI. The title reference 209WI DUL is the Fafnir 2MM209WI DUL form of the same duplex set. Barden lists the FAG B7xxxC.T.P4S series as the FAG equivalent of its H series.