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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 bearings, 25 x 42 x 9 mm, 15° contact angle, phenolic cage, matched duplex pair at light preload. 2 Pcs.
List Price
$162.05
2 in stock
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| MFR / Brand | NSK |
|---|---|
| MPN | 7905CTDULP4 |
| Model | 7905 C T DUL P4 / 2MM 9305 WI CR DUL / 71905-CD |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 25 mm |
| OD | 42 mm |
| Width | 9 mm |
| Material | High Carbon Chrome Steel |
|---|---|
| Series | 7900 |
| Base Number | 71905 |
| Industry Terms | Spindle bearing pair; super precision angular contact; matched duplex set; thin section spindle bearing |
| Common Misspellings | NSK 7905 CTDUL P4; 7905CTDULP4V; NKS 7905CTDULP4 |
| Application Types | High-speed machine tool spindles; grinding heads; compact precision gearboxes |
| Bore Shaft Size | 25 mm (0.9843 in) |
| Mpn Variants | 7905CTDULP4; 7905-C-T-DUL-P4; 7905 C T DUL P4; 71905CTDULP4; 7905CTDUL |
| 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 | 7905CTDULP4 |
| Cross Reference 1 | NSK 71905CTDULP4 |
|---|---|
| Cross Reference 2 | RHP 71905CTRDULP4 |
| Cross Reference 3 | NSK 7905A5 – 25° vs 15° contact angle |
| Cross Reference 4 | NSK 7005C – wider, 25x47x12 mm |
A matched duplex pair of NSK 7905C super-precision angular contact ball bearings, 25 mm bore, 42 mm outside diameter, 9 mm wide each. The 71900 series is the thinnest of the super-precision angular contact sections, chosen where a spindle needs a large shaft inside a small housing bore.
In this scheme 7905 is the ISO 19-series section, written in full as 71905. C sets the contact angle at 15°, T is a phenolic resin cage, DU marks the pieces as a ground duplex set, L is light preload and P4 is ABEC 7.
A 15° contact angle gives the highest limiting speed and the lowest axial stiffness of the standard angular contact angles, which is why grinding and high-frequency spindles use it. Light preload keeps running torque and heat generation down and leaves the most speed headroom. Phenolic resin rides the outer-ring land, is light and oil-absorbent, and works to about 120 °C, which suits oil-mist and oil-air lubrication.
2 Pcs, supplied as one matched duplex set. Ring faces are ground together so the pair reaches the specified light preload when clamped solid, with no shims and no measurement. Stack height for the pair is 18 mm.
Each bearing on its own takes thrust in one direction. Back-to-back or face-to-face, the pair takes thrust in both directions; in tandem it takes a larger load in one direction only.
The V etch across the two outer-ring faces aligns to give the ground arrangement; turning one ring relative to the other changes the preload the set was ground for. The 9 mm section is shallow, so the housing shoulder and shaft nut faces carry the clamping load over a small area and their squareness governs the running accuracy achieved.
The closest match is an NSK or RHP 71905C duplex pair at P4 and light preload with a phenolic cage. A 7905A5 has the same 25 x 42 x 9 mm size but a 25° contact angle. The 7005C is the wider 25 x 47 x 12 mm section and does not fit this housing bore.
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Rockwell’s own product page for the Kinetix 6000 is down
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.
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