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Deep Groove Ball Bearings: The Industry Default and When to Reach for Something Else
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Availability:
3 in stock
Tapered roller bearing cone, 2.1875 in bore x 0.9688 in wide, Class 3 precision, 123,000 N dynamic rating. Timken 28680-3 single cone, 28600 series.
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| MFR / Brand | Timken |
|---|---|
| MPN | 28680-3 |
| Model | 28680 #3 |
| Bearing Type | Tapered Roller Bearing Cone |
| ID | 2.1875 in (55.563 mm) |
| Series | 28600 |
|---|---|
| Mpn Variants | 28680-3, 28680, 28680 *3, 28680 #3, 286803 |
| Precision Class | Class 3 |
| Additional Attributes | C90: 32,000 N; Ca90: 22,000 N; K 1.45; db 68 mm |
| Dynamic Load Rating | 123,000 N |
| Static Load Rating | 142,000 N |
| Precision Rating | Class 3 |
| Rolling Elements | Tapered Roller |
| Harmonization Code | 8482.2 |
| Bearing Class | Class 3 |
| Cone Part Number | 28680 |
| Cone Width | 0.9688 in (24.608 mm) |
| Cone Backface To Clear Radius | 0.140 in (3.600 mm) |
| Cone Frontface Backing Diameter | 2.44 in (62 mm) |
| Cage Cone Frontface Clearance | 0.1 in (2.5 mm) |
| Cage Cone Backface Clearance | 0.04 in (1 mm) |
| Effective Center Location | -0.13 in (-3.3 mm) |
| Cross Reference 1 | Koyo 28680 - standard tolerance, not Class 3 |
|---|---|
| Cross Reference 2 | NTN 4T-28680 - standard tolerance, not Class 3 |
Timken 28680-3 is a Class 3 single cone (inner ring, tapered rollers and cage) for a single-row tapered roller bearing, 28600 series. Bore Diameter: 2.1875 in (55.563 mm). Cone Width: 0.9688 in (24.608 mm). Rolling Elements: Tapered Roller.
28680 — Timken single cone, 2.1875 in bore, 28600 series.
-3 / *3 — Timken Class 3 precision: tighter tolerance and lower runout than standard Class 2.
Dynamic Load Rating (C1): 123,000 N (27,700 lbf), ISO 1 million revolutions. Dynamic Radial Load Rating (C90): 32,000 N (7,180 lbf). Dynamic Axial Rating (Ca90): 22,000 N (4,950 lbf). Static Load Rating: 142,000 N (32,000 lbf). K Factor: 1.45. Precision Class: Class 3.
Effective Load Center: -0.13 in (-3.3 mm), inside the cone backface. Max Shaft Fillet Radius: 0.140 in (3.600 mm). Shaft Backing Shoulder Diameter: 2.44 in (62 mm) frontface, 2.68 in (68 mm) backface. Cage Location relative to backface (Aa): 0.04 in (1 mm). Cage Location relative to frontface (Ab): 0.1 in (2.5 mm).
Unit Quantity: 1 Pc. Cone only.
28680 is an ABMA inch cone number also built as Koyo 28680 and NTN 4T-28680, matching the bore and width at standard tolerance. The Class 3 grade is specific to this Timken cone.
Bore Diameter: 2.1875 in (55.563 mm). Cone Width: 0.9688 in (24.608 mm).
-3 / *3 is Timken Class 3 precision: tighter tolerance and lower runout than standard Class 2. Precision Class: Class 3.
Dynamic Load Rating (C1): 123,000 N. Static Load Rating: 142,000 N.
Unit Quantity: 1 Pc. Cone only.
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