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Availability:
3 in stock
Super precision angular contact ball bearing, 120 x 165 x 22 mm, 15° contact angle, phenolic cage, ABEC 7, medium preload duplex pair.
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| MFR / Brand | RHP |
|---|---|
| MPN | 7924CTDUMP4 |
| Model | 7924 C T DUM P4 / 71924 / 7924CTRDUMP4 / 2MM9324WI CR DUM |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 120 mm |
| OD | 165 mm |
| Width | 22 mm |
| Material | Chrome Steel |
|---|---|
| Series | 7900 |
| Condition | New |
| Preload | Medium preload |
| Base Number | 71924 |
| Industry Terms | Super precision spindle bearing, machine tool spindle bearing, duplex pair, universally ground angular contact bearing, phenolic cage angular contact, extra light section spindle bearing |
| Common Misspellings | 7924CTDUM P4, 7924 CTDUMP4, RHP 7924C TDUM P4, 71924CTDUMP-4 |
| Application Types | Machine tool spindles, grinding spindles, high speed rotary tables, precision indexing heads |
| Total Width | 44 mm for the duplex pair |
| Overall Width | 22 mm |
| Bore Shaft Size | 120 mm |
| Mpn Variants | 7924CTDUMP4, 7924-C-T-DUM-P4, 7924 C T DUM P4, 71924CTDUMP4, 71924, 7924X2, 7924CTRDUMP4, 2MM9324WICRDUM, 2MM9324WI-CR-DUM |
| Arrangement Configuration | Duplex pair, universally ground (DUM) |
| Precision Class | P4 / EP7 / ABEC 7 |
| Additional Attributes | Effective load center a: 30.1 mm. Permissible axial load Pa: 50.5 kN. Axial rigidity at medium preload: 199 N/micron. Measured axial clearance at medium preload: -35 micron. Shaft abutment da min 127 mm; housing abutment Da max 158 mm, Db max 160 mm. Fillet radii ra max 1 mm, rb max 0.6 mm. Bearing chamfer r min 1.1 mm, r1 min 0.6 mm. Calculation factor f0: 16.5. |
| Min Temp | -30 °C |
| Cage Type | Machined, outer ring land riding |
| Dynamic Load Rating | 90.5 kN per bearing |
| Static Load Rating | 81.0 kN per bearing |
| Precision Rating | ABEC 7 / P4 / EP7 |
| Rolling Elements | Ball |
| Max Temp | 120 °C |
| Item Weight | 2.56 lb (1.16 kg) each; 5.12 lb (2.32 kg) for the pair |
| Cage Material | Phenolic laminate |
| Limiting Speed | 8,100 rpm grease / 12,300 rpm oil or oil-air |
| Number Of Rows | 1 per bearing |
| Bore Type | Straight |
| Snap Ring Included | Without Snap Ring |
| Internal Clearance | N/A - preloaded set |
| Harmonization Code | 8482.10.50.28 |
| Contact Angle | 15° |
| Mounting Arrangement | Universally matchable - DB, DF or DT |
| Design Units | Metric |
| Bearing Material | Chrome bearing steel |
| Running Accuracy | P4 / ABEC 7 / ISO Class 4 |
| Part Number | 7924CTDUMP4 |
| Running Accuracy Radial And Axial Runout | P4 / ABEC 7 / ISO Class 4 |
| Cross Reference 1 | SKF 71924 CD/P4ADGB |
|---|---|
| Cross Reference 2 | NSK 7924CTRDUMP4 |
| Cross Reference 3 | FAG B71924-C-T-P4S-DUM |
| Cross Reference 4 | Fafnir 2MM9324WICRDUM |
RHP 7924CTDUMP4 super precision angular contact ball bearing. Series: 7900, extra light section. ISO designation 71924. Bore: 120 mm. Outside Diameter: 165 mm. Width: 22 mm. Contact Angle: 15°. Single row, open, universally ground and matchable. Also written 7924-C-T-DUM-P4, 7924 C T DUM P4 and 71924CTDUMP4.
C: 15° contact angle. T: machined laminated phenolic cage, outer ring land riding, rated to 120 °C. DUM: duplex pair, universally ground, medium preload. P4: EP7, equivalent to ABEC 7. Carton cross designations 7924X2 and Fafnir 2MM9324WICRDUM carry the same 15° angle.
Basic Dynamic Load Rating: 90.5 kN per bearing. Basic Static Load Rating: 81.0 kN per bearing. Permissible Axial Load: 50.5 kN. The 7900 extra light section puts a large bore inside a small outside diameter, which is what a compact high speed spindle needs. A 15° contact angle favours speed and radial stiffness. Limiting speed runs to 8,100 rpm on grease and 12,300 rpm on oil or oil-air lubrication. The phenolic cage is light and self lubricating and holds ball guidance steady to 120 °C.
Medium preload, 1,288 N across a back-to-back or face-to-face pair, giving 199 N/µm axial rigidity and 35 µm measured axial clearance. Effective Load Center a: 30.1 mm. Medium preload sits between the light setting’s low heat generation and the heavy setting’s stiffness, and it is the usual choice for a general purpose spindle position.
Two bearings, supplied as a universally ground duplex pair at medium preload. Universally ground rings mount back-to-back, face-to-face or in tandem, with the preload set by the ground ring faces.
Diameter of Shaft Abutment, da min: 127 mm. Diameter of Housing Abutment, Da max: 158 mm and Db max: 160 mm. Radius of Shaft or Housing Fillet, ra max: 1 mm, rb max: 0.6 mm. Bearing chamfer r min: 1.1 mm, r1 min: 0.6 mm. Recommended grease quantity: 7.3 g per bearing.
ISO base number 71924. Direct equivalents at the same 15° angle, P4 class and medium preload: NSK 7924CTRDUMP4, SKF 71924 CD/P4ADGB, FAG B71924-C-T-P4S-DUM, Fafnir 2MM9324WICRDUM.
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