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Timing Belt Pulleys and V-Belt Sheaves: Matching Belt Drive Components Correctly
Belt drives may appear simple, consisting of two wheels and a belt for power transfer.
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6 in stock
RHP 7212ETDUMP4 super-precision angular contact ball bearing pair, 60 x 110 x 22 mm, 25 degree contact angle, medium preload, phenolic cage, ABEC 7.
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| MFR / Brand | RHP |
|---|---|
| MPN | 7212ETDUMP4 |
| Model | 7212 E T DUM P4 / 3MM212 WI CR DUM / 212HDM |
| Bearing Type | Angular Contact Ball Bearing, Open |
| ID | 60 mm |
| OD | 110 mm |
| Width | 22 mm |
| Material | Chrome Steel |
|---|---|
| Series | 7200 |
| Lubricant | Oil or grease |
| Preload | Medium (M), 1,470 N axial (pair) |
| Base Number | 7212 |
| Industry Terms | Super precision spindle bearing, machine tool bearing, duplex matched pair, precision angular contact |
| Common Misspellings | 7212 ETDUM P4, 7212ETDUMP-4, 7212 E-T-DUM-P4 |
| Bore Shaft Size | 60 mm |
| Mpn Variants | 7212ETDUMP4, 7212 E T DUM P4, 7212-E-T-DUM-P4, 7212E, 3MM212WI CR DUM, 212HDM |
| Precision Class | P4 (ABEC 7) |
| Cage Type | Outer-ring guided |
| Dynamic Load Rating | 61,000 N (61.0 kN) per bearing |
| Static Load Rating | 47,000 N (47.0 kN) per bearing |
| Precision Rating | ABEC 7 |
| Rolling Elements | Balls |
| Max Temp | 120 °C |
| Item Weight | 1.558 kg (3.44 lb) per pair; 0.779 kg (1.72 lb) each |
| Cage Material | Laminated phenolic resin |
| Limiting Speed | 17,700 rpm oil/air; 11,000 rpm grease (single) |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Snap Ring Included | No |
| Harmonization Code | 8482.10.50 |
| Contact Angle | 25° |
| Mounting Arrangement | Duplex universal pair (DU) |
| Part Number | 7212ETDUMP4 |
| Cross Reference 1 | Fafnir 3MM212WI CR DUM |
|---|
The RHP 7212ETDUMP4 is a matched pair of single-row super-precision angular contact ball bearings (DUM, medium preload). Unit Quantity: 2 Pcs. Bore Diameter: 60 mm. Outside Diameter: 110 mm. Width: 22 mm per bearing. Contact Angle: 25°. Precision Class: P4 (ABEC 7, BS292 EP7). Series: 7200, ISO dimension series 02. Country of Origin: United Kingdom. RHP is an NSK brand.
7212 — single-row angular contact ball bearing, ISO dimension series 02, bore code 12 giving a 60 mm bore.
E — 25° contact angle.
T — laminated phenolic resin cage, outer-ring guided.
DU — paired unit with universal face control.
M — medium preload.
P4 — precision grade, ISO Class 4, ABEC 7.
3MM212WI CR DUM — Fafnir form on the carton: 3MM is 25°, CR is a phenolic outer-land-riding cage.
Dynamic Load Rating: 61.0 kN (61,000 N) per bearing. Static Load Rating: 47.0 kN (47,000 N) per bearing. Limiting Speed, single bearing: 17,700 rpm oil/air; 11,000 rpm grease. Limiting Speed, mounted back-to-back medium-preload pair (0.60 factor): 10,620 rpm oil/air; 6,600 rpm grease. Preload: Medium (M); Axial Preload: 1,470 N for the mounted pair. Axial Stiffness: 281 N/µm. Cage Material: Laminated phenolic resin. Cage Type: Outer-ring guided. Maximum Operating Temperature: 120 °C. Bearing Material: Carbon chrome bearing steel to BS970 534A99/535A99, equivalent to SAE 52100, through hardened. Rolling Elements: Balls. Number Of Rows: 1 per bearing. Bore Type: Straight. Closure Type: Open. Item Weight: 1.558 kg (3.44 lb) for the pair; 0.779 kg (1.72 lb) per bearing.
Minimum shaft abutment diameter: 69 mm. Maximum housing abutment diameter: 101 mm. Maximum outer ring abutment diameter: 104 mm. Chamfer r min: 1.5 mm. Chamfer r1 min: 1.0 mm. Effective load centre a: 30.8 mm. Internal volume: 35.1 cm³. Pitch circle diameter of lubrication jets: 79.0 mm.
Cross-reference: Fafnir 3MM212WI CR DUM. Also written 7212 E T DUM P4, 7212-E-T-DUM-P4 and 212HDM.
Each bearing is 60 mm bore, 110 mm outside diameter and 22 mm wide.
The E in the designation is a 25° contact angle. DUM is a universal paired unit at medium preload, with an axial preload of 1,470 N for the mounted pair.
Per bearing, Dynamic Load Rating is 61.0 kN and Static Load Rating is 47.0 kN. Single-bearing limiting speed is 17,700 rpm on oil/air and 11,000 rpm on grease.
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