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Central Surplus Bearing Finder
A faster way to search our bearing inventory Today we’re launching the Central Surplus Bearing
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1 in stock
Super-precision angular contact ball bearing pair, 45 mm bore × 85 mm OD × 19 mm wide each, 15° contact angle, medium preload, ABEC 7, sold as a matched duplex pair of 2 pieces.
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$211.42
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| MFR / Brand | RHP |
|---|---|
| MPN | 7209CTDUMP4 |
| Model | 7209 C T DUM P4 / 2MM209WI CR DUM |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 45 mm |
| OD | 85 mm |
| Width | 19 mm |
| Material | Bearing Steel |
|---|---|
| Series | 7200 |
| Base Number | 7209 |
| Industry Terms | spindle bearing, precision angular contact bearing, matched pair bearing, duplex set, ABEC 7 bearing, super precision ball bearing |
| Common Misspellings | 7209 CTDUM P4, 7209CTDUNP4, 7209CTDUMP-4, RHP 7209 CT DUM, 7029CTDUMP4 |
| Application Types | Machine tool spindles, grinding heads, precision ballscrew supports, indexing tables, high-speed gearboxes |
| Bore Shaft Size | 45 mm (1.7717 in) |
| Mpn Variants | 7209CTDUMP4, 7209-C-T-DUM-P4, 7209 C T DUM P4, 7209CTDUM P4, 7209CDUMP4 |
| Closure Type | Open |
| Rolling Elements | Ball |
| Number Of Rows | 1 per bearing, 2 in the pair |
| Bore Type | Straight |
| Snap Ring Included | Without Snap Ring |
| Harmonization Code | 8482.10.50 |
| Part Number | 7209CTDUMP4 |
| Cross Reference 6 | 7209ETDUMP4 (related size, 25° contact angle) |
|---|
A matched duplex pair of super-precision angular contact ball bearings, 45 mm bore, 85 mm outside diameter, 19 mm width per bearing, with a 15° contact angle, phenolic cage, medium preload and P4 running accuracy.
7209 — angular contact ball bearing, 72 series, bore code 09 = 45 mmC — 15° contact angle in the RHP/NSK schemeT — phenolic (laminated fabric) cageDU — duplex, ground as a matched pairM — medium preloadP4 — ABEC 7 precision class
A 15° contact angle biases the bearing toward speed and radial stiffness; a 25° angle in the same envelope carries more thrust and runs slower. The duplex ground faces let the two rings be clamped face-to-face or back-to-back with the preload set by the manufacturer, so axial stiffness is repeatable without shimming.
Medium preload sits between light and heavy: more axial rigidity and tighter shaft position than light preload, with more heat generation and a lower speed ceiling.
A phenolic cage is light and self-lubricating, which suits high dn values and oil-mist or grease lubrication, with a service temperature ceiling below that of a metal cage.
P4 governs bore, outside diameter and raceway runout to ABEC 7 limits — the class used for machine tool spindles and precision ballscrew and worm drives.
Two bearings, supplied as one matched duplex pair. Combined width across the pair is 38 mm. Open both faces, no seals or shields.
Duplex ground rings are mounted in the orientation marked on the ring faces, with the marks aligned so the ground offset produces the intended preload. Clamping is done against square, ground abutment faces, and the pair is handled as a set.
Same-spec equivalents to this pair: Fafnir 2MM209WI CR DUM, NSK 7209CTRDUMP4, FAG B7209-C-T-P4S-DUM, SKF 7209 CD/P4ADGB. A 7209E pair has a 25° contact angle and a 7209CTDUL or 7209CTDUH pair has light or heavy preload; both share the 45 × 85 × 19 mm envelope and are related sizes.
$231.30
29 in stock
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