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Central Surplus Bearing Finder
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Availability:
4 in stock
Matched duplex pair of super-precision angular contact ball bearings, 20 mm bore, 42 mm OD, 12 mm wide each, open, 15° contact angle, medium preload. 2 Pcs.
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$127.38
4 in stock
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| MFR / Brand | NSK |
|---|---|
| MPN | 7004CTYDUMPA7 |
| Model | 7004 C TY DUM PA7 / 2MM9104 WI CR DUM |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 20 mm |
| OD | 42 mm |
| Width | 12 mm |
| Material | High Carbon Chrome Steel |
|---|---|
| Series | 7000 |
| Base Number | 7004 |
| Industry Terms | super precision bearing, spindle bearing, matched pair bearing, machine tool bearing, precision angular contact bearing |
| Common Misspellings | 7004 CTYDUM PA7, 7004CTY DUMPA7, NSK 7004 bearng, angular contatct bearing |
| Bore Shaft Size | 20 mm (0.7874 in) |
| Mpn Variants | 7004CTYDUMPA7, 7004-C-TY-DUM-PA7, 7004 C TY DUM PA7, 7004CTYDUM, 7004C |
| Rolling Elements | Ball |
| Number Of Rows | 1 per bearing |
| Bore Type | Straight |
| Snap Ring Included | No |
| Harmonization Code | 8482.10.50 |
| Part Number | 7004CTYDUMPA7 |
A matched duplex pair of NSK 7004CTYDUMPA7 super-precision angular contact ball bearings. Each bearing has a 20 mm bore, 42 mm outside diameter and 12 mm width, is open on both faces and runs a straight bore. The pair is universally ground with medium preload built in.
7004 identifies an angular contact ball bearing in the ISO 70 light series with a 20 mm bore. In the NSK scheme C sets a 15° contact angle. TY denotes a ball-guided polyamide cage. DU marks the bearings as a universally ground duplex set and the following M sets medium preload.
A 15° contact angle favours speed and radial stiffness over thrust capacity, which is why this configuration is standard in high-speed spindles and small precision drives. Medium preload gives more axial and radial rigidity than a light-preload set, with correspondingly higher friction and heat generation, so it suits applications where positional stiffness matters more than the last increment of speed. The polyamide cage is light and quiet with a service ceiling around 120 °C.
Dynamic and static load ratings and the limiting speed are published in the specification table on this page.
Two bearings, supplied as a matched universal duplex set. Each is single row and open, with no snap ring, seals or shields.
Universal grinding allows assembly back-to-back, face-to-face or in tandem. Back-to-back or face-to-face mounting locates the shaft axially in both directions and develops the built-in medium preload as the rings are clamped; tandem mounting shares thrust in one direction only. A single row on its own takes thrust in one direction. The set is matched and stays together as supplied. Polyamide cages are handled clear of solvents and temperatures above their ceiling.
A substitution needs the same 15° angle and the same medium preload. A 7004 with a 25° or 30° angle, or with a light or heavy preload letter, shares the 20 x 42 x 12 mm envelope but is a related size rather than an equivalent. Same-spec designations from other manufacturers are listed in the cross-reference table.
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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