Motor Starters vs. Contactors vs. Overload Relays: What Each One Does and Why You Need All Three
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Super precision angular contact ball bearing, 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 | 7220CTRSULP4 |
| GTIN | 747023156740 |
| Model | 7220 C TR SUL P4 / 2MM220WI CR SUL / 7220CD SUL B7220C |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 100 mm (3.9370 in) |
| OD | 180 mm (7.0866 in) |
| Width | 34 mm |
| Material | Bearing Steel |
|---|---|
| Series | 7200 |
| Condition | New |
| Lubricant | Oil Preservative |
| Preload | Light |
| Running Accuracy | P4 |
| Base Number | 7220 |
| Industry Terms | Machine tool spindle bearing; super precision angular contact; universally ground single; ABEC 7 spindle bearing |
| Bore Shaft Size | 100 mm (3.9370 in) |
| Mpn Variants | 7220CTRSULP4; 7220-C-TR-SUL-P4; 7220 C TR SUL P4; 7220CD SUL; 7220C; 2MM220WI-CR-SUL; B7220C |
| Arrangement Configuration | SU — single universally ground bearing, matchable back-to-back, face-to-face or tandem |
| Precision Class | P4 (ABEC 7, RHP EP7, ISO Class 4) |
| Additional Attributes | Axial stiffness, paired 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. |
| Min Temp | -30 °C |
| Cage Type | Machined, outer ring guided |
| Dynamic Load Rating | 149,000 N (33,500 lbf) |
| Static Load Rating | 127,000 N (28,550 lbf) |
| Precision Rating | P4 / ABEC 7 / EP7 / ISO Class 4 |
| Rolling Elements | Steel balls |
| Max Temp | 120 °C |
| Item Weight | 6.99 lb (3.173 kg) |
| Cage Material | Laminated phenolic resin |
| Limiting Speed | 12,000 rpm oil/air; 7,500 rpm grease |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Snap Ring Included | No |
| Internal Clearance | N/A — preloaded |
| Harmonization Code | 8482.10.50.28 |
| Contact Angle | 15° |
| Mounting Arrangement | Universal face control |
| Design Units | Metric |
| Bearing Material | Through-hardened carbon chrome bearing steel (SAE 52100) |
| Part Number | 7220CTRSULP4 |
| 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 CDGA/P4A |
|---|---|
| Cross Reference 2 | FAG B7220-C-T-P4S-UL |
| Cross Reference 3 | Fafnir 2MM220WI-CR-SUL |
| Cross Reference 4 | 7220A5TRSUL (related size, 25° contact angle) |
| Cross Reference 5 | 7020CTRSUL (related size, lighter 70 section on the same bore) |
RHP 7220CTRSULP4 super precision angular contact ball bearing. Series: 72, ISO dimension series 02. Bore: 100 mm. Outside Diameter: 180 mm. Width: 34 mm. Country of origin: United Kingdom. Searchable forms: 7220CTRSULP4, 7220-C-TR-SUL-P4, 7220 C TR SUL P4, 7220CD SUL, and the carton cross-references 2MM220WI-CR-SUL and B7220C.
Contact Angle: 15°. Cage: TR, laminated phenolic resin, outer ring guided. Grouping: SU, a single universally ground bearing. Preload: Light, 980 N axial when paired. Precision Grade: P4 — ABEC 7, RHP EP7, ISO Class 4.
Dynamic Load Rating: 149,000 N. Static Load Rating: 127,000 N. Limiting speed: 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 a paired axial stiffness of 137 N/µm. The laminated phenolic cage runs quietly at speed and is rated to 120 °C.
One bearing. Universal grinding means any two of these bearings form a matched pair at the light preload value, in back-to-back, face-to-face or tandem order.
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, which sets the grease charge at 20 to 30 per cent fill. The high point of radial runout is marked by a burnished spot on the inner ring face and a V line on the outer ring diameter.
Same-spec equivalents: SKF 7220 CDGA/P4A, FAG B7220-C-T-P4S-UL, Fafnir 2MM220WI-CR-SUL. Related size: 7220A5TRSUL, the 25° version of the same envelope, and 7020CTRSUL, the lighter 70 section on the same bore.
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