Timing Belt Pulleys and V-Belt Sheaves: Matching Belt Drive Components Correctly
Belt drives may appear simple, consisting of two wheels and a belt for power transfer.
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Matched duplex pair of 15° super-precision angular contact ball bearings, 55 mm bore x 100 mm OD x 21 mm wide each (42 mm stacked), medium preload — a stiffer-than-light spindle set for machine tool and instrument spindles. Sold as the pair, 2 pieces.
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$97.85
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Here are some other options that might fit your project — cross-referenced equivalents and similar parts we have in stock and ready to ship. Need help choosing? Call 585-295-7880.
Super-Precision Angular Contact Spindle Bearing, 55x100x21 mm, 15° Contact Angle, Universally Ground Single, Medium Preload, ABEC 7 (P4)$128.78
Angular Contact Ball Bearing — 55 mm ID, 100 mm OD, 21 mm Width, 15° Contact Angle, ABEC 7 / P4S, Light Preload$258.99
Angular Contact Ball Bearing - 55 mm ID, 100 mm OD, 21 mm Width, 25° Contact Angle, P4S, Light Preload$126.10
Double-Row Angular Contact Ball Bearing, 55 x 100 x 33.3 mm, 30 Degree Contact Angle, Open, Normal Clearance, 1 Pc$37.31| MFR / Brand | Barden |
|---|---|
| MPN | 211HDM |
| Model | 211 HD L / 7211 C T DUM P4 / 2MM211WI CR DUM |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 55 mm |
| OD | 100 mm |
| Width | 21 mm |
| Material | Chrome Steel |
|---|---|
| Series | 200 |
| Lubricant | Oil |
| Preload | Light Preload |
| Total Width | 42 mm as a duplex pair |
| Base Number | 7211 |
| Industry Terms | Spindle bearing, machine tool bearing, precision duplex pair, matched set angular contact, instrument bearing |
| Common Misspellings | Barden 211 HDM, Bardin, Baden 211HDM, 211HDN, 211H-DM |
| Application Types | Machine tool spindles, grinding spindles, precision rotary tables, instrument and aerospace spindles |
| Bore Shaft Size | 55 mm |
| Mpn Variants | 211HDM, 211-HDM, 211 HDM, 211HD-M, BARDEN 211HDM |
| Rolling Elements | Ball |
| Number Of Rows | 1 per bearing (duplex pair) |
| Bore Type | Straight |
| Snap Ring Included | No |
| Harmonization Code | 8482.10.50 |
| Part Number | 211HDM |
A Barden 211HDM matched duplex pair of super-precision angular contact ball bearings on the 7211 envelope: 55 mm bore, 100 mm OD, 21 mm wide each, 42 mm stacked as a pair. Barden builds instrument-grade and machine-tool-grade precision bearings, and the HDM designation is a factory-matched duplex set ground for medium preload. Typical homes are milling and grinding spindles, high-accuracy rotary tables, and instrument and aerospace spindles.
211 is the ISO 7211 envelope, 55 x 100 x 21 mm. H is the Barden high-precision angular contact series. D is duplex, supplied as a factory-matched pair. M is medium preload. The carton cross-references 7211-C-T-DUM-P4 and 2MM211WI-CR-DUM, both of which are 15° medium-preload duplex designations, so the contact angle for this pair is 15°.
A 15° contact angle favours speed and radial capacity over thrust, which is why it dominates the high-speed end of spindle design. Medium preload sits between light and heavy: noticeably stiffer than a light-preload set, with better axial positioning under cutting load, at the cost of more friction and heat than light preload. If the spindle drawing calls for DUL or DUH, this pair is not a substitute — preload level is a design parameter, not a preference.
Bore: 55 mm. Outside diameter: 100 mm. Width: 21 mm each bearing. Total width mounted as a pair: 42 mm. Contact angle: 15°. Preload: medium. Rows: single row each, mounted as a duplex pair. Closure: open. Cage: machined brass. Dynamic load rating: 47.5 kN / 10678 lbf. Static load rating: 38 kN / 8543 lbf. Limiting speed: 14000 rpm. Mass: 1.35 lbs.
Two bearings, supplied as the factory-matched duplex set. The rings are ground with matched offsets, so mounting the pair back-to-back or face-to-face produces the intended medium preload with no spacer.
Same-specification alternatives are 7211-envelope 15° medium-preload duplex sets, including 7211-C-T-DUM-P4 and the Fafnir 2MM211WI-CR-DUM. Related but NOT interchangeable: 211HDL and 211HDH are the light and heavy preload versions of this same bearing, and 3MM211WI / 7211E are the same envelope at 25°. Both angle and preload must match the original.
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Belt drives may appear simple, consisting of two wheels and a belt for power transfer.
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If you pulled a bearing off general industrial equipment at random, there’s a good chance
Our team can locate, cross-reference, and source all parts.
Our team can locate, cross-reference, and source all parts.
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