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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:
2 in stock
Double-row spherical roller bearing, 50 mm tapered bore (1:12) x 110 mm OD x 27 mm wide, open, reinforced E design, W33 outer-ring lubrication groove.
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| MFR / Brand | SKF |
|---|---|
| GTIN | 7316577612533 |
| Model | 21310E K W33 |
| Bearing Type | Spherical Roller Bearing, Open |
| ID | 50 mm |
| OD | 110 mm |
| Width | 27 mm |
| Material | Chrome Steel |
|---|---|
| Series | 21300 |
| Base Number | 21310 |
| Industry Terms | spherical roller bearing; self-aligning roller bearing; taper bore roller bearing; adapter sleeve bearing; W33 grooved roller bearing |
| Common Misspellings | 21310 E K W33; 21310-E-K-W33; 21310 spherical bearing |
| Application Types | conveyor pulleys and idlers; fans and blowers; crushers and screens; plummer-block shafting on plain shafts |
| Bore Shaft Size | 50 mm (1.9685 in), 1:12 tapered bore |
| Locking Method | Adapter sleeve on a 1:12 taper, locked by KM nut and MB washer |
| Mpn Variants | 21310 EK/W33; 21310EK/W33; 21310-EK-W33; 21310EKW33; 21310 EK W33; 21310EK; 21310E K W33 |
| Compatible With Replaces | Adapter sleeve H310 (45 mm shaft seat), locknut KM 10, lockwasher MB 10 - all separate parts |
| Rolling Elements | Spherical Roller |
| Number Of Rows | 2 |
| Bore Type | Tapered Bore |
| Snap Ring Included | No |
| Harmonization Code | 8482.30.00.80 |
| Internal Clearance | CN (normal) |
| Part Number | 21310 EK/W33 |
| Maximum Permissible Misalignment | 1.5° |
An SKF 21310 EK/W33 double-row spherical roller bearing. Bore 50 mm on a 1:12 taper, outside diameter 110 mm, width 27 mm, open on both faces. Two rows of barrel-shaped rollers share one spherical raceway in the outer ring, so the bearing accommodates shaft deflection and housing misalignment.
213 — dimension series, the narrower of the spherical roller series.
10 — bore code, 50 mm.
E — reinforced internal design, larger rollers and higher capacity within the same envelope.
K — 1:12 tapered bore.
W33 — lubrication groove machined around the outer ring with three radial feed holes.
No clearance suffix — radial internal clearance is normal, CN.
Bore Diameter: 50 mm (1.9685 in), 1:12 tapered. Outside Diameter: 110 mm. Width: 27 mm. Rolling Elements: Spherical Roller. Number Of Rows: 2. Bore Type: Tapered Bore. Seal Type: Open. Internal Clearance: CN (normal). Series: 213. Base Number: 21310. Maximum Permissible Misalignment: 1.5°. Material: Chrome Steel. UPC: 7316577612533. Unit Quantity: 1 Pc.
A tapered-bore spherical roller bearing seats on a matching 1:12 taper. On a plain cylindrical shaft the taper is provided by an adapter sleeve H310 (45 mm shaft seat) with a KM 10 locknut and an MB 10 lockwasher. The outer-ring W33 groove and holes let grease reach the rollers through the housing.
Straight-bore SKF 21310 E/W33 shares the envelope but mounts on a cylindrical shaft with no sleeve. The older 21310 CCK/W33 is a different internal design. MPN variants: 21310 EK/W33; 21310EK/W33; 21310-EK-W33; 21310EKW33; 21310 EK W33; 21310EK.
What does K mean in 21310 EK?A 1:12 tapered bore.
What does W33 mean?A lubrication groove around the outer ring with three radial holes.
What are the dimensions?50 mm bore, 110 mm outside diameter, 27 mm width.
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