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Super precision angular contact ball bearing, 55 x 100 x 21 mm, 25° contact angle, phenolic cage, ABEC 7, light preload universal quad set.
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| MFR / Brand | RHP |
|---|---|
| MPN | 7211ETQULP4 |
| Model | 7211 E T QUL P4 / B-7211-X3-TA-4US-EP7 / 3MM211WI CR QUL / |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 55 mm |
| OD | 100 mm |
| Width | 21 mm |
| Material | Bearing Steel |
|---|---|
| Series | 7200 |
| Condition | New |
| Lubricant | Oil |
| Preload | Light |
| Base Number | 7211 |
| Industry Terms | Super precision spindle bearing, machine tool spindle bearing, quadruplex set, universally ground angular contact bearing, phenolic cage angular contact |
| Common Misspellings | 7211ETQUL P4, 7211 ET QULP4, RHP 7211E TQUL P4, 7211ETQULP-4 |
| Application Types | Machine tool spindles, grinding spindles, precision screw drives, high speed rotary tables |
| Overall Width | 21 mm |
| Bore Shaft Size | 55 mm |
| Mpn Variants | 7211ETQULP4, 7211-E-T-QUL-P4, 7211 E T QUL P4, B7211X3TA4ULEP7, B-7211-X3-TA-4UL-EP7, 3MM211WICRQUL, 3MM211WI-CR-QUL |
| Arrangement Configuration | Quadruplex set, universally ground (QUL) |
| Precision Class | P4 / EP7 / ABEC 7 |
| Additional Attributes | Effective load center a: 28.6 mm. Permissible axial load Pa: 32.5 kN. Axial rigidity at light preload: 182 N/micron. Measured axial clearance at light preload: -13 micron. Shaft abutment da min 64 mm; housing abutment Da max 91 mm, Db max 94 mm. Fillet radii ra max 1.5 mm, rb max 0.8 mm. Bearing chamfer r min 1.5 mm, r1 min 1 mm. |
| Min Temp | -30 °C |
| Cage Type | Machined, outer ring land riding |
| Dynamic Load Rating | 63.5 kN per bearing |
| Static Load Rating | 38.0 kN per bearing |
| Precision Rating | ABEC 7 / P4 / EP7 |
| Rolling Elements | Ball |
| Max Temp | 120 °C |
| Item Weight | 5.26 lb (2.38 kg) for the four bearing set; 1.31 lb (0.596 kg) each |
| Cage Material | Phenolic laminate |
| 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 | 25° |
| Mounting Arrangement | Universally matchable - DB, DF or DT |
| Design Units | Metric |
| Bearing Material | Chrome bearing steel |
| Part Number | 7211ETQULP4 |
| Running Accuracy Radial And Axial Runout | ABEC 7 / ISO Class 4 |
| Cross Reference 1 | SKF 7211 ACD/P4A |
|---|---|
| Cross Reference 2 | NSK 7211A5TRQULP4 |
| Cross Reference 3 | FAG B7211E.T.P4S.QUL |
| Cross Reference 4 | Fafnir 3MM211WICRQUL |
| Cross Reference 6 | NSK 7211CTRQULP4 (related size, 15° contact angle) |
RHP 7211ETQULP4 super precision angular contact ball bearing. Series: 7200. Bore: 55 mm. Outside Diameter: 100 mm. Width: 21 mm. Contact Angle: 25°. Single row, open, universally ground and matchable. Also written 7211-E-T-QUL-P4, 7211 E T QUL P4 and 7211ETQUL P4.
E: 25° contact angle. T: machined laminated phenolic cage, outer ring land riding, rated to 120 °C. QUL: quadruplex set, universally ground, light preload. P4: EP7, equivalent to ABEC 7. Carton cross designations B7211X3TA4ULEP7 and Fafnir 3MM211WICRQUL carry the same 25° angle and EP7 class.
Basic Dynamic Load Rating: 63.5 kN per bearing. Basic Static Load Rating: 38.0 kN per bearing. Permissible Axial Load: 32.5 kN. A 25° contact angle carries more thrust and less speed than a 15°, which suits fixed spindle positions and screw drives that see high axial reaction. Limiting speed runs to 13,000 rpm on grease and 19,400 rpm on oil or oil-air lubrication. The phenolic cage is light and self lubricating, holding ball guidance steady at high speed and at 120 °C.
Light preload, 491 N across a back-to-back or face-to-face pair, giving 182 N/µm axial rigidity and 13 µm measured axial clearance. Effective Load Center a: 28.6 mm. Light preload trades some rigidity for lower heat generation and longer grease life.
Four bearings, supplied as a universally ground quadruplex set. Universally ground rings mount in any combination — back-to-back, face-to-face or tandem — and the set preload is achieved by the ground ring faces.
Diameter of Shaft Abutment, da min: 64 mm. Diameter of Housing Abutment, Da max: 91 mm and Db max: 94 mm. Radius of Shaft or Housing Fillet, ra max: 1.5 mm, rb max: 0.8 mm. Bearing chamfer r min: 1.5 mm, r1 min: 1 mm. Recommended grease quantity: 3.7 g per bearing.
ISO base number 7211. Direct equivalents at the same 25° angle and P4 class: NSK 7211A5TRQULP4, SKF 7211 ACD/P4A, FAG B7211E.T.P4S.QUL. Related size at a 15° angle: NSK 7211CTRQULP4.
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