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Super precision angular contact ball bearing, 50 x 72 x 12 mm, 15 degree contact angle, ABEC 7 class, light preload, phenolic cage. Thin 719 section.
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$131.03
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| MFR / Brand | RHP |
|---|---|
| MPN | 7910CTSULP4 |
| Model | 7910 C T SUL P4 /71910 / 2MM9310WI CR DUL |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 50 mm |
| OD | 72 mm |
| Width | 12 mm |
| Material | Bearing Steel |
|---|---|
| Series | 7900 |
| Condition | New |
| Preload | Light Preload |
| Base Number | 71910 |
| Industry Terms | Super precision bearing; thin section bearing; spindle bearing; machine tool bearing; grinding spindle bearing; precision angular contact; universally ground single |
| Common Misspellings | 7910 CTSUL P4; 7910CTSUL P4; RHP 7910 C T SULP4; 71910CTSUL |
| Application Types | Machine tool spindles; grinding heads; compact high-speed spindles; large-shaft small-housing assemblies |
| Total Width | 12 mm |
| Bore Shaft Size | 50 mm (1.9685 in) |
| Mpn Variants | 7910CTSULP4; 7910-C-T-SUL-P4; 7910 C T SUL P4; 71910CTSULP4; 7910C; 71910 |
| Arrangement Configuration | Single universal (SU) |
| Precision Class | P4 (ISO Class 4, ABEC 7) |
| Dynamic Load Rating C1 | 16,900 N |
| Additional Attributes | Effective load centre a 14.2 mm; internal free volume 6.7 cm3; lubrication jet PCD 57.9 mm; axial stiffness 51 N/micron at light preload as a paired set |
| Cage Type | Machined, outer ring guided |
| Dynamic Load Rating | 16,900 N |
| Static Load Rating | 15,000 N |
| Precision Rating | ABEC 7 |
| Rolling Elements | Steel balls |
| Max Temp | 120 °C |
| Item Weight | 0.129 kg (0.284 lb) |
| Cage Material | Phenolic |
| Limiting Speed | 31,100 rpm oil/air; 18,600 rpm grease |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Snap Ring Included | No |
| Harmonization Code | 8482.10.50 |
| Contact Angle | 15° |
| Bearing Class | ISO Class 4 |
| Bearing Material | Carbon chrome bearing steel (SAE 52100) |
| Part Number | 7910CTSULP4 |
| Cross Reference 3 | NSK 7910CTRSULP4 |
|---|
A single-row super-precision angular contact ball bearing in the thin 719 section. Bore: 50 mm. Outside Diameter: 72 mm. Width: 12 mm. Contact Angle: 15°. Cage Material: Phenolic. Cage Type: Machined, outer ring guided. Preload: Light (L). Precision Class: P4 (ISO Class 4, ABEC 7). Seal Type: Open. Closure Type: Open, no seal or shield. Bore Type: Straight. Number of Rows: 1. Rolling Elements: Steel balls. Bearing Material: Carbon chrome bearing steel to BS970 534A99/535A99 or SAE 52100.
In the RHP super-precision scheme 7 is a single-row angular contact ball bearing, 9 is ISO dimension series 19, bore code 10 is a 50 mm bore, C is a 15° contact angle, T is a machined laminated phenolic cage, SU is universal face control, L is light preload and P4 is ISO Class 4. The ISO base number for the same envelope is 71910.
Dynamic Load Rating: 16,900 N. Static Load Rating: 15,000 N. Limiting Speed: 31,100 rpm oil/air; 18,600 rpm grease. Axial Preload, light class, as a paired set: 100 N. Axial Stiffness, light class, as a paired set: 51 N/µm. Maximum Operating Temperature: 120 °C, set by the laminated phenolic cage. Mass: 0.129 kg (0.284 lb).
The 15° contact angle is the speed-biased angle, keeping ball centrifugal and gyroscopic effects low so the bearing runs faster and cooler than a 25° bearing in the same envelope. Light preload generates the least friction heat of the four standard preload grades while still fixing the contact angle and making axial position and runout repeatable. The bearing is preload-set at manufacture rather than clearance-set. The laminated phenolic cage is light, so cage inertia and ball-pocket loads stay low, and it retains an oil film well. The tabulated limiting speeds are single-bearing figures under spring preload with the inner ring rotating; a back-to-back pair at light preload takes a 0.80 speed factor, and face-to-face mounting takes a further 50 per cent reduction.
1 Pc. Universal face control single (SU), open on both faces. Universal facing means two pieces of this designation clamp solid to the light preload back-to-back, face-to-face or in tandem.
Inner ring abutment diameter d1: 55 mm minimum. Outer ring abutment diameter D1: 67 mm maximum. Outer ring seat diameter D2: 69.5 mm maximum. Fillet radius r: 0.6 mm minimum. Fillet radius r1: 0.3 mm minimum. Effective Load Centre a: 14.2 mm. Internal free volume: 6.7 cm³. PCD of lubrication jets: 57.9 mm.
71910 is the ISO base designation for this envelope and B7910X2TAULEP7K5 the RHP B-series carton form, where X2 is 15° and EP7 the RHP class equal to ABEC 7. NSK 7910CTRSULP4 is the current NSK-scheme number for the same bearing, and the Fafnir equivalent is 2MM9310WI CR. Same-envelope bearings differing in contact angle, preload grade or tolerance class are related sizes rather than interchanges.
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