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Matched duplex pair of super-precision angular contact ball bearings, 45 x 75 x 16 mm, 15° contact angle, medium preload, phenolic cage, ABEC 7.
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$59.25
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| MFR / Brand | Barden |
|---|---|
| MPN | 109HDM |
| Model | 2MM9109WICR DUM / 7009 CD P4A DGB / 109 HD M |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 45 mm |
| OD | 75 mm |
| Width | 16 mm |
| Material | Chrome Steel |
|---|---|
| Series | 7000 |
| Condition | New – Open box |
| Lubricant | Oil |
| Preload | Medium |
| Total Width | 32 mm for the pair |
| Base Number | 109 |
| Condition Note | Made In USA, New Old Stock |
| Bore Shaft Size | 45 mm |
| Mpn Variants | 109-HDM; 109 HD M; Barden 109; 7009-C; 2MM9109WICR DUM |
| Rolling Elements | Ball |
| Number Of Rows | 1 per bearing |
| Bore Type | Straight |
| Snap Ring Included | No |
| Harmonization Code | 8482.10.50.28 |
| Part Number | 109HDM |
Barden 109HDM super-precision angular contact ball bearings, supplied as a matched duplex pair. Bore: 45 mm. Outside Diameter: 75 mm. Overall Width: 16 mm per bearing, 32 mm for the pair. Number Of Rows: 1 per bearing. Rolling Elements: Ball. Bore Type: Straight. Closure Type: Open. Bearing Material: chrome steel. Series: Barden 100, the ISO 70 dimension series, so this size is a 7009. Item Weight: 0.51 lb.
Contact Angle: 15°. Preload: medium. Arrangement: matched duplex, from the HDM code. Cage Material: phenolic. Cage Type: machined, outer-ring land-riding. Precision Class: P4, equivalent to ABEC 7 and ISO Class 4. Bore code: Barden numbers the 100 series in five-millimetre steps, and 109 is a 45 mm bore. Searchable forms of the number: 109HDM, 109-HDM, 109 HD M, Barden 109, 7009-C.
A 15° contact angle favours speed and radial rigidity over thrust capacity, which is the standard machine-tool spindle choice. A matched duplex pair is ground as a unit so that clamping the two together sets the medium preload exactly, with no shimming and no measurement: the faces carry the offset that produces it. Medium preload sits between light and heavy — more axial and angular stiffness than light, a lower speed ceiling, and more internal heat. The phenolic cage is machined and rides on the outer ring land, so a stationary surface guides it at speed, and the material’s low mass and self-lubricating character keep cage friction down.
Unit Quantity: 2 Pcs. A matched duplex set of two bearings, ground together and marked as a set. Internal Clearance: N/A. A preload-set duplex pair has no radial clearance class.
Lubricant: grease or oil. The two bearings of a matched set are ground as one unit and carry set markings; keeping them together and mounting them in their marked order preserves the rated preload.
Carton designations carried on this part: 2MM9109WICR DUM and 7009 CD P4A DGB. The Fafnir 2MM prefix independently confirms the 15° angle, DUM is the Fafnir duplex-medium code that matches HDM, and SKF’s DGB is the medium preload class. Same-envelope 15° super-precision executions in other schemes: SKF 7009 CD/P4A, NSK 7009CTRDUM, RHP 7009CTDUMP4 and FAG B7009-C-T-P4S-DUM. A 7009A5 or 7009E in this 45 x 75 x 16 mm envelope carries a 25° contact angle, which makes it a related size rather than a substitution.
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