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Super precision angular contact ball bearing pair, 100 x 180 x 34 mm, 15° contact angle, light preload, laminated phenolic cage, P4 tolerance, heavy 72 section.
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| MFR / Brand | RHP |
|---|---|
| MPN | 7220CTDULP4 |
| Model | 7220 C T DUL P4 / 2MM220WI CR DUL / 7220CD B7220CTP4SDUL |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 100 mm (3.9370 in) |
| OD | 180 mm (7.0866 in) |
| Width | 34 mm |
| Material | Steel |
|---|---|
| Series | 7200 |
| Condition | New |
| Preload | Light |
| Base Number | 7220 |
| Industry Terms | Machine tool spindle bearing; super precision angular contact; matched duplex pair; ABEC 7 spindle bearing |
| Total Width | 68 mm (2.6772 in) mounted as a pair |
| Bore Shaft Size | 100 mm (3.9370 in) |
| Mpn Variants | 7220CTDULP4; 7220-C-T-DUL-P4; 7220 C T DUL P4; 7220CD; 7220C; B7220X2TDUEP7; 2MM220WI-CR-DUL |
| 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 light preload: 137 N/µm. Effective load centre a: 35.7 mm. Abutment: d1 112 mm max, D1 168 mm min, D2 173 mm max. Corner radius r 2.5 mm min, r1 1.5 mm min. Internal free volume 139.2 cm³ per bearing. Back-to-back pair at light preload runs at 0.80 of the single-bearing limiting speed. |
| Min Temp | -30 °C |
| Cage Type | Machined, outer ring guided |
| Dynamic Load Rating | 149,000 N (33,500 lbf) per bearing |
| Static Load Rating | 127,000 N (28,550 lbf) per bearing |
| Precision Rating | P4 / ABEC 7 / EP7 / ISO Class 4 |
| Rolling Elements | Steel balls |
| Max Temp | 120 °C |
| Item Weight | 13.99 lb (6.35 kg) for the pair; 3.173 kg each |
| Cage Material | Laminated phenolic resin |
| Limiting Speed | 12,000 rpm oil/air; 7,500 rpm grease (single bearing) |
| Number Of Rows | 1 per bearing |
| Bore Type | Straight |
| Snap Ring Included | No |
| Internal Clearance | N/A — preloaded set |
| Lubricant | Oil/air or grease |
| Harmonization Code | 8482.10.50 |
| Contact Angle | 15° |
| Mounting Arrangement | Universal face control |
| Design Units | Metric |
| Bearing Material | Through-hardened carbon chrome bearing steel (SAE 52100) |
| Part Number | 7220CTDULP4 |
| Running Accuracy Radial And Axial Runout | P4: inner ring radial runout 5 µm max, outer ring radial runout 7.5 µm max |
| Cross Reference 1 | SKF 7220 CD/P4ADGA |
|---|---|
| Cross Reference 2 | Fafnir 2MM220WI-CR-DUL |
| Cross Reference 3 | NSK 7220CTYNSULP4 (related size, polyamide cage) |
| Cross Reference 4 | FAG B7220-C-T-P4S-DUL |
| Cross Reference 5 | 7220A5TRDUL (related size, 25° contact angle) |
RHP 7220CTDULP4 super precision angular contact ball bearing set. Series: 72, ISO dimension series 02. Bore: 100 mm. Outside Diameter: 180 mm. Width: 34 mm per bearing. Country of origin: United Kingdom. Searchable forms: 7220CTDULP4, 7220-C-T-DUL-P4, 7220 C T DUL P4, 7220CD, and the carton cross-references B7220X2TDUEP7 and 2MM220WI-CR-DUL.
Contact Angle: 15°. Cage: laminated phenolic resin, outer ring guided. Grouping: DU, a universally ground pair. Preload: Light, 980 N axial. Precision Grade: P4 — ABEC 7, RHP EP7, ISO Class 4. The carton also carries the RHP B-series form B7220X2TDUEP7, in which X2 is the 15° angle and EP7 is the same P4 class.
Dynamic Load Rating: 149,000 N per bearing. Static Load Rating: 127,000 N per bearing. Limiting speed for a single bearing: 12,000 rpm on oil/air, 7,500 rpm on grease. The 72 section is the heaviest of the three super precision series, so a 7220 carries markedly higher load than a 7020 on the same 100 mm bore. A 15° contact angle carries more speed and less thrust than a 25°. Light preload gives the pair an axial stiffness of 137 N/µm. 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: 68 mm.
Effective load centre: 35.7 mm. Abutment dimensions: shaft shoulder 112 mm maximum, housing shoulder 168 mm minimum, outer ring abutment 173 mm maximum. Corner radii: 2.5 mm minimum outer, 1.5 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 139.2 cm³ per bearing, which sets the grease charge at 20 to 30 per cent fill. Mounted back-to-back at light preload the recommended limiting speed is 80 per cent of the single-bearing figure.
Same-spec equivalents: SKF 7220 CD/P4ADGA, FAG B7220-C-T-P4S-DUL, Fafnir 2MM220WI-CR-DUL. Related size: NSK 7220CTYNSULP4, same envelope and angle with a polyamide cage, and 7220A5TRDUL, the 25° version.
$53.53
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