Barden209HX12D110Angular Contact Ball Bearing — 45 mm ID, 85 mm OD, 19 mm Width, 15° Contact Angle, ABEC 7 / P4S, 110 lb Mean Preload

Product Description

What this part is

The Barden 209HX12D110 is a super precision angular contact ball bearing set in the metric 200 H series, built for machine tool spindles. Each bearing measures 45 mm bore, 85 mm outside diameter and 19 mm wide, with a 15° contact angle and ABEC 7 / P4S precision. The set is two universal-ground bearings with a 110 lb mean preload.

Decoding the designation

209 — Metric 200 series, bore code 09, 45 mm bore; ISO equivalent 7209C.

H — Spindle angular contact design, non-separable, relieved outer ring, with a one-piece reinforced phenolic halo cage guided on the outer ring.

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

110 — Numerals after D give the mean preload in pounds: 110 lb (489 N), in place of a standard L, M or H preload.

What these specs mean in practice

Bore Diameter: 45 mm. Outside Diameter: 85 mm. Overall Width: 19 mm per bearing. These match the ISO 7209 envelope, so the bearing fits housings dimensioned for that size.

Contact Angle: 15°. The shallow angle favours high speed and radial stiffness over maximum axial load.

Dynamic load rating: 35,377 N. Static load rating: 28,064 N. These ratings set the fatigue life and static overload limit per bearing.

Limiting Speed: 17,000 rpm grease; 25,000 rpm oil. Oil lubrication supports the higher figure.

Preload: 110 lb (489 N) mean preload. The special preload sits between Barden standard Medium and Heavy for this size, trading some speed for added stiffness.

Cage Material: Phenolic. The light, outer-ring-guided halo cage carries lubricant and runs quietly at high speed.

Precision Class: ABEC 7 / P4S. P4S combines ABEC 7 dimensional tolerances with ABEC 9 running accuracy for low spindle runout.

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

Mounting data

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

Quantity and configuration

The listing is a set of 2 bearings, universal duplex (D), 110 lb mean preload. The pair mounts DB, DF or DT. Barden standard preload range for this size is Light 175 N, Medium 440 N and Heavy 885 N.

Interchange guidance

FAG B7209C.T.P4S, SKF 7209 CD/P4A, NSK 7209C P4 and Timken Fafnir 2MM209WI share the same 45 x 85 x 19 mm envelope and 15° contact angle, at standard preload rather than this 110 lb special set. Barden’s own cross for the 209HC is FAG B7209C.T.P4S. The X12 suffix is a Barden special feature code.