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Deep Groove Ball Bearings: The Industry Default and When to Reach for Something Else
If you pulled a bearing off general industrial equipment at random, there’s a good chance
Availability:
1 in stock
Super precision angular contact ball bearing, 55 x 90 x 18 mm, 25° contact angle, ABEC 7 / P4, medium preload, phenolic cage. 1 Pc, half of a duplex pair.
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| MFR / Brand | RHP |
|---|---|
| MPN | 7011ETDUMP4-1/2PR |
| Model | 7011 E T DUM P4 / B7011X3 TA DUM EP7 / 3MM9111WI CR DUM |
| Bearing Type | Angular Contact Ball Bearing |
| ID | 55 mm |
| OD | 90 mm |
| Preload | Medium (M) |
|---|---|
| Base Number | 7011 |
| Industry Terms | spindle bearing; machine tool bearing; precision angular contact; duplex set; universally ground |
| Application Types | Machine tool spindles; grinding heads; high speed gearboxes; precision rotary tables |
| Bore Shaft Size | 55 mm |
| Mpn Variants | 7011ETDUMP4-1/2PR; 7011ETDUMP4; 7011 E T DUM P4; 7011-E-T-DUM-P4; 7011E; 7011ETDUM |
| Manufacturer Status | RHP super precision production transferred to NSK |
| Precision Class | ABEC 7 / P4 |
| Cage Material | Phenolic |
| Number Of Rows | 1 |
| Contact Angle | 25° |
| Part Number | 7011ETDUMP4-1/2PR |
| Overall Width | 18 mm |
| Cross Reference 1 | NSK 7011A5 - 55x90x18 mm, 25° angle; preload scheme differs |
|---|---|
| Cross Reference 2 | FAG B7011E-T-P4S - 55x90x18 mm, 25° angle; preload scheme differs |
| Cross Reference 3 | SKF 7011ACD/P4A - 55x90x18 mm, 25° angle; preload scheme differs |
RHP 7011ETDUMP4-1/2PR super precision angular contact ball bearing in the ISO 70 light series, universally ground, supplied as one bearing from a duplex pair. Bore Diameter: 55 mm. Outside Diameter: 90 mm. Overall Width: 18 mm. Contact Angle: 25°. Cage Material: Phenolic. Preload: Medium (M). Precision Class: ABEC 7 / P4.
7011 — ISO 70 (light) series angular contact ball bearing, 55 x 90 x 18 mm.
E — RHP contact angle code for 25°.
T — phenolic machined cage.
DUM — Duplex, Universally ground, Medium preload.
P4 — ABEC 7 tolerance class.
-1/2PR — half of a pair: one bearing.
A 25° contact angle sits in the middle of the super precision range. Against a 15° bearing it carries substantially more thrust and gives higher axial stiffness, with a lower limiting speed and more heat at the same duty.
Medium preload is the general purpose choice for machine tool spindles: enough rigidity to hold a bore or a face tolerance under cutting load, without the heat generation of heavy preload.
The phenolic cage is light, holds oil in its own porosity and tolerates marginal lubrication better than a steel cage.
Unit Quantity: 1 Pc. Half of a universally ground duplex pair. Universally ground bearings mount back-to-back, face-to-face or in tandem, and the ground offset on the rings sets the preload when two are clamped together; the DUM medium preload is realised with a second matching 7011E-T-P4 bearing.
RHP super precision production transferred to NSK. 55 x 90 x 18 mm super precision bearings at 25°: NSK 7011A5, FAG B7011E-T-P4S, SKF 7011ACD/P4A. Preload and mounting scheme differ by maker.
Bore Diameter: 55 mm. Outside Diameter: 90 mm. Overall Width: 18 mm.
-1/2PR is half of a pair: this listing is one bearing. Unit Quantity: 1 Pc.
DUM is Duplex, Universally ground, Medium preload. Preload: Medium (M).
Contact Angle: 25°. Precision Class: ABEC 7 / P4.
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