Barden211HDLAngular Contact Ball Bearing — 55 mm ID, 100 mm OD, 21 mm Width, 15° Contact Angle, ABEC 7 / P4S, Light Preload

Product Description

What this part is:

The Barden 211HDL is a super precision angular contact ball bearing set in the metric 200 H series, built for machine tool spindles. Each bearing measures 55 mm bore, 100 mm outside diameter and 21 mm wide, with a 15° contact angle and ABEC 7 / P4S precision. The set is two universal-ground bearings with light preload.

Decoding the designation:

211 — Metric 200 series, bore code 11, 55 mm bore; ISO equivalent 7211C.

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).

L — Light standard preload.

What these specs mean in practice:

Bore Diameter: 55 mm. Outside Diameter: 100 mm. Overall Width: 21 mm per bearing. These match the ISO 7211 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: 51,656 N. Static load rating: 43,357 N. These ratings set the fatigue life and static overload limit per bearing.

Limiting Speed: 14,000 rpm grease; 21,000 rpm oil. Oil lubrication supports the higher figure.

Preload: Light (L), 220 N standard preload. Light preload keeps heat generation low at spindle speed.

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 1.50 mm. Maximum fillet radius r2 on the non-thrust side is 0.76 mm.

Quantity and configuration:

The listing is a set of 2 bearings, universal duplex (D), light preload. The pair mounts DB, DF or DT. Barden standard preload range for this size is Light 220 N, Medium 710 N and Heavy 1,420 N.

Interchange guidance:

FAG B7211C.T.P4S, SKF 7211 CD/P4A, NSK 7211C P4 and Timken Fafnir 2MM211WI share the same 55 x 100 x 21 mm envelope and 15° contact angle; the NSK part is P4 rather than P4S class. Barden lists FAG B7211C.T.P4S as the FAG cross for the 211HC.