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2 in stock
Super precision angular contact ball bearing pair, 100 x 150 x 24 mm, 25° contact angle, medium preload, laminated phenolic cage, P4 tolerance.
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$644.17
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| MFR / Brand | RHP |
|---|---|
| MPN | 7020ETDUMP4 |
| GTIN | 747023065233 |
| Model | 7020E-T-DUM-P4 / 3MM9120WI CR DUM / 7020A 7020A5 7020ACD |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 100 mm (3.9370 in) |
| OD | 150 mm (5.9055 in) |
| Width | 24 mm |
| Material | Chrome Steel |
|---|---|
| Condition | New |
| Preload | Medium preload |
| Base Number | 7020 |
| Industry Terms | Machine tool spindle bearing; super precision angular contact; matched duplex pair; ABEC 7 spindle bearing |
| Total Width | 48 mm (1.8898 in) mounted as a pair |
| Bore Shaft Size | 100 mm (3.9370 in) |
| Mpn Variants | 7020ETDUMP4; 7020-E-T-DUM-P4; 7020 E T DUM P4; 7020A; 7020A5; 7020ACD; B7020TAUMEP7; 3MM9120WI-CR-DUM |
| Arrangement Configuration | DU — universally ground duplex pair, mountable back-to-back, face-to-face or tandem |
| Precision Class | P4 (ABEC 7, RHP EP7, ISO Class 4) |
| Additional Attributes | Axial stiffness, pair at medium preload: 417 N/µm. Effective load centre a: 41.1 mm. Abutment: d1 109 mm max, D1 141 mm min, D2 144 mm max. Corner radius r 1.5 mm min, r1 1.0 mm min. Internal free volume 53.4 cm³ per bearing. Back-to-back pair at medium preload runs at 0.60 of the single-bearing limiting speed. |
| Cage Type | Machined, outer ring guided |
| Dynamic Load Rating | 71,000 N (15,960 lbf) per bearing |
| Static Load Rating | 73,500 N (16,520 lbf) per bearing |
| Precision Rating | P4 / ABEC 7 / EP7 / ISO Class 4 |
| Series | 70 Series (ISO dimension series 10) |
| Rolling Elements | Steel balls |
| Max Temp | 120 °C |
| Item Weight | 5.57 lb (2.53 kg) for the pair; 1.264 kg each |
| Cage Material | Laminated phenolic resin |
| Limiting Speed | 11,800 rpm oil/air; 7,600 rpm grease (single bearing) |
| Number Of Rows | 1 per bearing |
| Snap Ring Included | No |
| Internal Clearance | N/A — preloaded set |
| Lubricant | Oil/air or grease |
| Harmonization Code | 8482.10.50.28 |
| Contact Angle | 25° |
| Mounting Arrangement | Universal face control |
| Design Units | Metric |
| Bearing Material | Through-hardened carbon chrome bearing steel (SAE 52100) |
| Part Number | 7020ETDUMP4 |
| Running Accuracy Radial And Axial Runout | P4: inner ring radial runout 5 µm max, outer ring radial runout 7 µm max |
| Cross Reference 1 | SKF 7020 ACD/P4ADGB |
|---|---|
| Cross Reference 2 | FAG B7020-E-T-P4S-DUM |
| Cross Reference 3 | Fafnir 3MM9120WI-CR-DUM |
| Cross Reference 4 | NSK 7020A5TRDUMP4 |
| Cross Reference 5 | 7020CTRDUM (related size, 15° contact angle) |
RHP 7020ETDUMP4 super precision angular contact ball bearing set. Series: 70, ISO dimension series 10. Bore: 100 mm. Outside Diameter: 150 mm. Width: 24 mm per bearing. Country of origin: United Kingdom. Searchable forms: 7020ETDUMP4, 7020-E-T-DUM-P4, 7020 E T DUM P4, 7020A, 7020A5, and the carton cross-references B7020TAUMEP7 and 3MM9120WI-CR-DUM.
Contact Angle: 25°. Cage: laminated phenolic resin, outer ring guided. Grouping: DU, a universally ground pair. Preload: Medium, 1,960 N axial. Precision Grade: P4 — ABEC 7, RHP EP7, ISO Class 4.
Dynamic Load Rating: 71,000 N per bearing. Static Load Rating: 73,500 N per bearing. Limiting speed for a single bearing: 11,800 rpm on oil/air, 7,600 rpm on grease. A 25° contact angle carries more thrust and less speed than a 15°, which suits spindles working against heavy axial cutting loads. Medium preload gives the pair an axial stiffness of 417 N/µm and holds the shaft closer to position under changing load. The laminated phenolic cage runs quietly at speed and is rated to 120 °C.
Two pieces, supplied as a universally faced pair. Universal face control lets the pair mount back-to-back, face-to-face or in tandem at the same preload value. Total width mounted side by side: 48 mm.
Effective load centre: 41.1 mm. Abutment dimensions: shaft shoulder 109 mm maximum, housing shoulder 141 mm minimum, outer ring abutment 144 mm maximum. Corner radii: 1.5 mm minimum outer, 1.0 mm minimum inner. Recommended shaft fit at P4 for a 100 mm seat is a mean 3 µm interference; a locating housing bore takes a mean 7 µm clearance. Internal free volume is 53.4 cm³ per bearing, which sets the grease charge at 20 to 30 per cent fill. Mounted back-to-back at medium preload the recommended limiting speed is 60 per cent of the single-bearing figure.
Same-spec equivalents: SKF 7020 ACD/P4ADGB, FAG B7020-E-T-P4S-DUM, Fafnir 3MM9120WI-CR-DUM, NSK 7020A5TRDUMP4. Related size: 7020CTRDUM, the 15° version of the same envelope.
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