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Central Surplus Bearing Finder
A faster way to search our bearing inventory Today we’re launching the Central Surplus Bearing
Availability:
2 in stock
Super precision angular contact ball bearing pair, 40 x 90 x 23 mm, 25° contact angle, open, phenolic cage, light preload, duplex matched, ABEC 7.
List Price
$143.79
2 in stock
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| MFR / Brand | RHP |
|---|---|
| MPN | 7308ATDULP4 |
| Model | 7308-A-T-DUL-P4 |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 40 mm |
| OD | 90 mm |
| Width | 23 mm |
| Material | Bearing Steel |
|---|---|
| Series | 7300 |
| Base Number | 7308 |
| Industry Terms | Super precision spindle bearing pair; matched duplex bearing set; machine tool spindle bearing; 25 degree angular contact; heavy series spindle bearing |
| Common Misspellings | 7308 ATDUL P4; 7308ATDUL-P4; 7308A TDULP4 |
| Application Types | Machine tool spindles; grinding spindles; high-thrust precision spindles; vertical turret drives |
| Bore Shaft Size | 40 mm (1.5748 in) |
| Mpn Variants | 7308ATDULP4; 7308A-T-DUL-P4; 7308 A T DUL P4; 7308X4TADUEP7; 7308-X4-TA-DU-EP7; 3MM308WI CR DUL; 3MM308WICRDUL |
| 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 | 7308ATDULP4 |
| Cross Reference 1 | NSK 7308A5TRDULP4 |
|---|---|
| Cross Reference 2 | 7308 B – 40° vs 25° contact angle |
| Cross Reference 3 | 7208 – 72 series, same 40 mm bore, smaller OD |
RHP 7308ATDULP4 super precision angular contact ball bearings, supplied as a factory-matched duplex pair. 40 mm bore, 90 mm outside diameter, 23 mm width per bearing. Open on both faces, phenolic outer-ring-guided cage, 25° contact angle, light preload, ABEC 7 precision. The carton also carries 7308X4TADUEP7 and 3MM308WI CR DUL.
7308 gives an angular contact bearing in the 73 dimension series with bore code 08, a 40 mm bore. The 25° contact angle is read from the alternate markings: 3MM in the Fafnir scheme and A5 in the NSK equivalent both denote 25°. T is the fabric-base laminate phenolic cage, matching CR on the Fafnir marking. DU marks a duplex matched set and L light preload. P4 is ISO Class 4, equal to ABEC 7, and EP7 on the third marking says the same.
The 73 dimension series is the heaviest of the three angular contact series for a given bore, so a 7308 carries markedly more radial and thrust load than a 7208 or 7008 on the same 40 mm shaft. A 25° contact angle adds thrust capacity and axial stiffness over a 15° bearing at some cost in speed. Light preload is the setting chosen where speed and low heat generation matter more than maximum rigidity. The phenolic cage rides on the outer ring land, which keeps it stable and quiet at speed.
2 Pcs, one matched duplex pair, ground so the light preload comes up on assembly with no shimming. The load ratings and limiting speed listed are per bearing.
Assembly is dry and clean, interference fit on the inner rings, location fit in the housing bore, with both rings clamped fully home against their shoulders so the ground offset closes. The arrangement mark on the outer ring faces sets the orientation. Heat is applied to the shaft rather than the bearing because of the phenolic cage.
Another maker’s 40 x 90 x 23 mm 25° duplex pair at light preload and ABEC 7 substitutes directly. A 7308B is a 40° bearing in the same envelope, so it is a related size with different thrust and speed behaviour rather than a direct substitute. The 7208 and 7008 share the 40 mm bore in lighter series and are likewise related sizes.
A faster way to search our bearing inventory Today we’re launching the Central Surplus Bearing
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Our team can locate, cross-reference, and source all parts.
Our team can locate, cross-reference, and source all parts.
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