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Availability:
6 in stock
Super precision angular contact ball bearing, 90 x 160 x 30 mm, 25° contact angle, phenolic cage, ABEC 7, medium preload duplex pair.
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$705.89
6 in stock
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| MFR / Brand | RHP |
|---|---|
| MPN | 7218ETDUMP4 |
| Model | 7218 E T DUM P4 / 3MM218WI CR DUM / 7218A5 7218AC |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 90 mm |
| OD | 160 mm |
| Width | 30 mm |
| Material | Chrome Steel |
|---|---|
| Series | 7200 |
| Condition | New |
| Lubricant | Oil |
| Preload | Medium |
| Base Number | 7218 |
| Industry Terms | Super precision spindle bearing, machine tool spindle bearing, duplex pair, universally ground angular contact bearing, phenolic cage angular contact, 25 degree angular contact bearing |
| Common Misspellings | 7218ETDUM P4, 7218 ETDUMP4, RHP 7218E TDUM P4, 7218ETDUMP-4 |
| Application Types | Machine tool spindles, vertical spindles, precision screw drives, high load rotary tables |
| Total Width | 60 mm for the duplex pair |
| Overall Width | 30 mm |
| Bore Shaft Size | 90 mm |
| Mpn Variants | 7218ETDUMP4, 7218E-T-DUM-P4, 7218 E T DUM P4, 7218ETDUM P4, B7218X3TADUMEP7, B-7218-X3-TA-DUM-EP7, 3MM218WICRDUM, 3MM218WI-CR-DUM, 7218A5, 7218AC |
| Arrangement Configuration | Duplex pair, universally ground (DUM) |
| Precision Class | P4 / EP7 / ABEC 7 |
| Additional Attributes | Effective load center a: 44.1 mm. Permissible axial load Pa: 83.5 kN. Axial rigidity at medium preload: 416 N/micron. Measured axial clearance at medium preload: -39 micron. Shaft abutment da min 100 mm; housing abutment Da max 150 mm, Db max 154 mm. Fillet radii ra max 2 mm, rb max 1 mm. Bearing chamfer r min 2 mm, r1 min 1 mm. |
| Min Temp | -30°C |
| Cage Type | Machined, outer ring land riding |
| Dynamic Load Rating | 147 kN per bearing |
| Static Load Rating | 100 kN per bearing |
| Precision Rating | ABEC 7 / P4 / EP7 |
| Rolling Elements | Balls |
| Max Temp | 120 °C |
| Item Weight | 5.09 lb (2.31 kg) each; 10.18 lb (4.62 kg) for the pair |
| Cage Material | Phenolic laminate |
| Limiting Speed | 8,000 rpm grease / 12,000 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 |
| Contact Angle | 25° |
| 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 | 7218ETDUMP4 |
| Running Accuracy Radial And Axial Runout | P4 / ABEC 7 / ISO Class 4 |
| Cross Reference 1 | SKF 7218 ACD/P4ADGB |
|---|---|
| Cross Reference 2 | NSK 7218A5TRDUMP4 |
| Cross Reference 3 | FAG B7218E.T.P4S.DUM |
| Cross Reference 4 | Fafnir 3MM218WICRDUM |
| Cross Reference 6 | NSK 7218CTRDUMP4 (related size, 15° contact angle) |
RHP 7218ETDUMP4 super precision angular contact ball bearing. Series: 7200. Bore: 90 mm. Outside Diameter: 160 mm. Width: 30 mm. Contact Angle: 25°. Single row, open, universally ground and matchable. Also written 7218E-T-DUM-P4, 7218 E T DUM P4 and 7218ETDUM P4.
E: 25° 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. The carton carries three schemes at once — RHP 7218ETDUMP4, RHP B-series B7218X3TADUMEP7 and Fafnir 3MM218WICRDUM — and all three give the same 25° angle and ABEC 7 class.
Basic Dynamic Load Rating: 147 kN per bearing. Basic Static Load Rating: 100 kN per bearing. Permissible Axial Load: 83.5 kN. A 25° contact angle carries substantially more thrust than a 15° and trades away some speed, which suits a fixed spindle position, a vertical shaft or a screw drive taking high axial reaction. Limiting speed runs to 8,000 rpm on grease and 12,000 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, 2,899 N across a back-to-back or face-to-face pair, giving 416 N/µm axial rigidity and 39 µm measured axial clearance. Effective Load Center a: 44.1 mm. The wide 44.1 mm load centre on a 25° bearing puts the load lines well apart in a back-to-back pair, which is what gives this size its high moment stiffness.
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: 100 mm. Diameter of Housing Abutment, Da max: 150 mm and Db max: 154 mm. Radius of Shaft or Housing Fillet, ra max: 2 mm, rb max: 1 mm. Bearing chamfer r min: 2 mm, r1 min: 1 mm. Recommended grease quantity: 12 g per bearing.
ISO base number 7218. Direct equivalents at the same 25° angle, P4 class and medium preload: NSK 7218A5TRDUMP4, SKF 7218 ACD/P4ADGB, FAG B7218E.T.P4S.DUM, Fafnir 3MM218WICRDUM. Related size at a 15° angle: NSK 7218CTRDUMP4.
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