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Matched pair of super-precision angular contact ball bearings, 60 mm bore x 110 mm OD x 22 mm wide each, 25° contact angle, phenolic cage, medium preload, ABEC 7. Two bearings ship together, universally ground for spindle duplex mounting.
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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 | Bearing Steel |
|---|---|
| Series | 7200 |
| Condition | New – Open box |
| Preload | Medium |
| Base Number | 7212 |
| Industry Terms | spindle bearing pair; super precision angular contact; machine tool bearing; matched set bearing; duplex ground pair |
| Common Misspellings | 7212ETDUM P4; 7212 ET DUMP4; RPH 7212ETDUMP4; 7212EDUMP4; 7212ETDULP4 |
| Application Types | Machine tool spindles; precision gearboxes; grinding heads; rotary tables |
| Total Width | 44 mm stacked as a pair |
| Condition Note | Made In England, New Old Stock |
| Bore Shaft Size | 60 mm (2.3622 in) |
| Mpn Variants | 7212ETDUMP4; 7212 E T DUM P4; 7212-E-T-DUM-P4; 7212E; 7212ETDUM |
| Arrangement Configuration | Matched duplex pair, universally ground (DB, DF or DT) |
| Precision Class | ABEC 7 / ISO P4 |
| Min Temp | -30°C |
| Cage Type | Phenolic |
| Dynamic Load Rating | 61 kN |
| Static Load Rating | 51 kN |
| Precision Rating | ABEC 7 / P4 |
| Rolling Elements | Ball |
| Max Temp | 120°C |
| Item Weight | 1.80 lbs |
| Cage Material | Phenolic |
| Number Of Rows | 1 per bearing |
| Bore Type | Straight |
| Snap Ring Included | Without Snap Ring |
| Harmonization Code | 8482.10.50.68 |
| Contact Angle | 25 degrees |
| Design Units | Metric |
| Bearing Material | Chrome bearing steel |
| Part Number | 7212ETDUMP4 |
| Cross Reference 1 | 3MM212WICRDUM |
|---|---|
| Cross Reference 2 | 212HDM |
| Cross Reference 3 | B7212ETADUMP4 |
A matched pair of RHP 7212ETDUMP4 super-precision single-row angular contact ball bearings, each 60 mm bore by 110 mm outside diameter by 22 mm wide. The 7212 designation is the ISO 72-series light-section angular contact envelope. These are spindle bearings for machine tools, precision gearboxes and high-speed rotary equipment.
7212 — single-row angular contact ball bearing, 60 x 110 x 22 mmE — 25° contact angle in the RHP schemeT — phenolic laminated-fabric cageDU — duplex universally groundM — medium preloadP4 — ABEC 7 precision class
The 25° contact angle carries considerably more thrust than a 15° bearing of the same envelope while still supporting high shaft speeds. It is the standard choice for milling and drilling spindles where the cut produces axial load alongside radial load.
The phenolic cage is light and self-lubricating, which lowers friction and lifts the speed ceiling relative to a machined brass cage, at the cost of a lower maximum operating temperature. Oil-mist, oil-air and light-grease lubrication suit it.
Universal grinding means both faces are finished so that the two bearings form a set at a defined medium preload in back-to-back, face-to-face or tandem arrangement, with no shim stack or measurement needed at assembly. Medium preload gives higher spindle stiffness and running accuracy than light preload and runs warmer.
Bore: 60 mmOutside diameter: 110 mmWidth: 22 mm per bearingStacked width of the pair: 44 mmRows: 1 per bearingContact angle: 25°Precision class: ABEC 7 / ISO P4Preload: mediumCage: phenolicClosure: open
Two bearings ship as one matched pair. Spacer rings, lock nuts and housings are not included.
The high shoulder on the outer ring shows the contact angle direction and sets the arrangement. Back-to-back carries moment load and is the usual spindle configuration. Face-to-face accommodates a small amount of misalignment. Tandem doubles thrust capacity in a single direction. ABEC 7 running accuracy survives only on shaft and housing seats held to matching roundness and cylindricity tolerance.
Fafnir 3MM212WICRDUM and Barden 212HDM are the same specification under other numbering schemes: 25°, medium preload, duplex universally ground, ABEC 7 class. Same-envelope 7212 bearings at 15° or 40°, at light or heavy preload, or at P0 or P5 class are different parts.
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