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, 30 x 62 x 16 mm, 25° contact angle, phenolic cage, light preload, 32,700 rpm oil-air speed limit.
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| MFR / Brand | RHP |
|---|---|
| MPN | 7206ETTULP4 |
| Model | 7206 E T DUL P4 / 3MM206WI CR DUL |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 30 mm |
| OD | 62 mm |
| Width | 16 mm |
| Condition | New – Open box |
|---|---|
| Preload | Light |
| Material | Bearing Steel |
| Base Number | 7206 |
| Industry Terms | Spindle bearing; super-precision angular contact bearing; triple matched set; machine tool spindle bearing |
| Common Misspellings | 7206ET TUL P4; 7206-ETTUL-P4; RHP 7206 ETUL P4 |
| Application Types | Machine tool spindles; grinding spindles; milling heads; precision rotary tables |
| Total Width | 48 mm (1.8898 in) across the triple set |
| Condition Note | Made In England, New Old Stock, Grease |
| Bore Shaft Size | 30 mm (1.1811 in) |
| Mpn Variants | 7206ETTULP4; 7206-E-T-TUL-P4; 7206 E T TUL P4; 7206ETDULP4; 7206X3TADULEP7; 7206X3TAEP7 |
| Arrangement Configuration | Triple universally ground set (TUL) |
| Precision Class | EP7 (ABEC 7, ISO Class 4) |
| Additional Attributes | Effective load centre a: 18.7 mm, Permissible axial load Pa: 12.0 kN, Shaft abutment da min: 36 mm, Housing abutment Da max: 56 mm, Db max: 57 mm, Fillet radii ra max 1 mm, rb max 0.5 mm, Chamfer r min 1 mm, r1 min 0.6 mm, Recommended grease charge: 1.2 g per bearing, Preload ladder: EL 105 N / 85 N/µm, L 202 N / 108 N/µm, M 457 N / 147 N/µm, H 881 N / 192 N/µm |
| Min Temp | -30°C |
| Cage Type | Machined, outer-ring guided |
| Dynamic Load Rating | 27.8 kN |
| Static Load Rating | 14.1 kN |
| Precision Rating | EP7 (ABEC 7, ISO Class 4) |
| Series | 7200 (ISO 72 light section) |
| Rolling Elements | Steel balls |
| Max Temp | 120 °C |
| Item Weight | 0.194 kg (0.43 lb) per bearing |
| Cage Material | Machined laminated phenolic (RHP T / NSK TR), 120 °C |
| Number Of Rows | 1 per bearing |
| Bore Type | Straight |
| Snap Ring Included | N/A |
| Internal Clearance | N/A |
| Harmonization Code | 8482.10.50.28 |
| Contact Angle | 25° |
| Mounting Arrangement | Universal |
| Design Units | Metric |
| Bearing Material | Bearing steel |
| Running Accuracy | P4 |
| Part Number | 7206ETTULP4 |
| Running Accuracy Radial And Axial Runout | EP7 (ABEC 7) |
| Cross Reference 1 | Fafnir 3MM206WI CR TUL |
|---|---|
| Cross Reference 2 | SKF 7206 ACD/P4A |
| Cross Reference 3 | NSK 7206A5TRSULP4 |
| Cross Reference 4 | FAG B7206E.T.P4S |
| Cross Reference 6 | RHP 7206X2 (related size, 15° contact angle) |
RHP 7206ETTULP4 super-precision angular contact ball bearings, single row, open. Bore: 30 mm. Outside diameter: 62 mm. Width: 16 mm. Contact angle: 25°. Precision: EP7, equivalent to ABEC 7 and ISO Class 4. Series: 72, light section.
7206: 30 mm bore in the ISO 72 dimension series. E: 25° contact angle. T: machined laminated phenolic cage, outer-ring guided, rated to 120 °C. TUL: triple universally ground set at light preload. P4: EP7 precision, ABEC 7. The carton also carries the RHP B-series form 7206X3TADULEP7, where X3 is the same 25° angle, and the Fafnir equivalent 3MM206WI CR TUL, where 3MM is again 25°.
Basic dynamic load rating Cr: 27.8 kN. Basic static load rating C0r: 14.1 kN. Permissible axial load Pa: 12.0 kN. Limiting speed: 21,800 rpm on grease, 32,700 rpm on oil or oil-air. Effective load centre a: 18.7 mm. Light preload: 202 N, giving 108 N/µm axial rigidity across a back-to-back or face-to-face pair. Mass: 0.194 kg (0.43 lb) per bearing. Recommended grease charge: 1.2 g per bearing.
A 25° contact angle carries substantially more thrust than a 15° bearing on the same envelope and trades away some speed for it, which is why it is the usual choice where the spindle sees heavy axial cutting load. The machined phenolic cage is outer-ring guided and takes 120 °C, and its low mass is what allows the 32,700 rpm oil-air figure against 21,800 rpm on grease. Light preload gives 108 N/µm of axial stiffness per pair while keeping running torque and heat low.
Three pieces. Universally ground, so the three mount as a TUL triple set, or in any back-to-back, face-to-face or tandem combination, and reach light preload on assembly without shims.
Shaft abutment diameter da: 36 mm minimum. Housing abutment diameters Da: 56 mm maximum, Db: 57 mm maximum. Fillet radii: ra 1 mm maximum, rb 0.5 mm maximum. Chamfer dimensions r 1 mm minimum, r1 0.6 mm minimum.
NSK 7206A5TRSULP4 is the same bearing in NSK’s current scheme, since NSK owns RHP: A5 is the 25° angle, TR the outer-ring-guided phenolic cage. Also same spec: Fafnir 3MM206WI CR, SKF 7206 ACD/P4A, FAG B7206E.T.P4S. Related size at a different angle, not a substitute: 7206C and 7206X2, both 15°.
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