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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, 45 mm bore x 85 mm OD x 19 mm wide, 15 degree contact angle, ABEC 7, matched duplex pair at medium preload. 2 Pcs.
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$201.74
1 in stock
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| MFR / Brand | SNR |
|---|---|
| MPN | 7209CG1DUJ84 |
| Model | 7209C T DUM P4 / 2MM209WI CR DUM / 7209 C G1 DU J84 |
| 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 | Super precision spindle bearing; matched duplex pair; ABEC 7 angular contact; machine tool spindle bearing |
| Common Misspellings | 7209CG1DUJ4; 7209-CG1-DU-J84; SNR 7209CGIDUJ84; 7209 CG1DUJ84 |
| Application Types | Machine tool spindles; grinding spindles; precision gearboxes; rotary tables |
| Bore Shaft Size | 45 mm (1.7717 in) |
| Mpn Variants | 7209CG1DUJ84; 7209-C-G1-DU-J84; 7209 C G1 DU J84; 7209CG1DUJ-84; 7209CDUJ84 |
| Compatible With Replaces | RHP 7209-C-T-DUM-P4; Fafnir 2MM209WI-CR-DUM |
| Rolling Elements | Ball |
| Number Of Rows | 1 per bearing |
| Bore Type | Straight |
| Snap Ring Included | Without Snap Ring |
| Harmonization Code | 8482.10.50 |
| Part Number | 7209CG1DUJ84 |
A super-precision angular contact ball bearing in the 7209 size, supplied as a factory-matched duplex pair. Bore 45 mm, outside diameter 85 mm, width 19 mm per bearing.
7209 — ISO angular contact 72-series: 45 mm bore, 85 mm outside diameter, 19 mm width.
C — 15° contact angle in the SNR scheme.
G1 — phenolic cage.
DU — duplex universal pair.
J84 — super-precision class at medium preload. The equivalent designation in the RHP scheme is 7209-C-T-DUM-P4, which places it at ABEC 7 with a medium preload. The lighter-preload grade in the same scheme is J74.
A 15° contact angle is the high-speed end of the angular contact range, with less centrifugal ball loading and less heat than a 25° bearing of the same envelope and proportionally less thrust capacity. Medium preload raises axial and radial stiffness over the light grade and holds running accuracy better as load varies, at the cost of higher friction and a higher steady-state temperature. The phenolic cage is light and self-lubricating, which is what makes the cage speeds of a 15° super-precision bearing practical, and it sets a lower temperature ceiling than machined bronze.
2 Pcs — one matched duplex pair. The set can be arranged back-to-back, face-to-face or in tandem.
The preload is ground into the ring faces and is realised only when both inner rings and both outer rings are clamped solidly against their seats. Alignment marks on the outer ring faces set the intended arrangement.
Genuine same-spec equivalents: RHP 7209-C-T-DUM-P4 and Fafnir 2MM209WI-CR-DUM, both 15° medium-preload universal pairs at the same precision class. Same-envelope 7209 bearings at a 25° or 40° contact angle, or at the light J74 or a heavy preload grade, are related sizes rather than interchanges.
$141.11
255 in stock
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