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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
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5 in stock
Imperial single-row tapered roller bearing CONE ONLY (inner ring with rollers and cage), 2.2650 in / 57.531 mm bore, 0.8640 in / 21.946 mm inner-ring width, Timken Class 3 precision. Mates cup 382A. The cup is a separate part and is not included. Sold as 1 Pc.
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| MFR / Brand | Timken |
|---|---|
| MPN | 388A-3 |
| Model | 388 A 3 |
| Bearing Type | Tapered Roller Bearing Cone |
| ID | 2.2650" |
| Series | 385 |
|---|---|
| Base Number | 388A |
| Industry Terms | taper cone, inner race with rollers, TS cone, single cone, precision taper cone |
| Application Types | Pinion and gear shafts, industrial gearboxes and reducers, machine tool spindles, wheel ends, agricultural drivetrains |
| Overall Width | 0.8640 in / 21.946 mm |
| Bore Shaft Size | 2.2650 in / 57.531 mm |
| Mpn Variants | 388A-3, 388A3, 388-A-3, 388A *3, 388A #3, 388A, 388A-382A |
| Compatible With Replaces | Mates with cup 382A (also 382). Standard-precision 388A shares the envelope but not the Class 3 tolerance grade. 388 without the A is a separate catalogue item. |
| Arrangement Configuration | Single row, cone only |
| Precision Class | Class 3 (Timken) |
| Dynamic Load Rating C1 | 108,000 N / 24,200 lbf (388A/382A assembly) |
| Dynamic Load Rating | 108,000 N / 24,200 lbf (C1, 388A/382A assembly) |
| Static Load Rating | 107,000 N / 24,100 lbf (C0, 388A/382A assembly) |
| Precision Rating | Class 3 (Timken) |
| Item Weight | 5.51 lb / 2.499 kg |
| Number Of Rows | Single row |
| Design Units | Imperial |
| Bearing Material | High Alloy Steel |
| Part Number | 388A-3 |
| Cone Part Number | 388A |
| Cone Width | 0.8640" |
| Cone Backface To Clear Radius | 0.14" |
| Cone Frontface Backing Diameter | 2.48" |
| Cage Cone Frontface Clearance | 0.11" |
| Cage Cone Backface Clearance | 0.03" |
| Effective Center Location | -0.12" |
| Cross Reference 1 | Bower/BCA 388A - standard precision, not Class 3 |
|---|---|
| Cross Reference 2 | Koyo 388A - standard precision, not Class 3 |
| Cross Reference 3 | NTN 4T-388A - standard precision, not Class 3 |
| Cross Reference 4 | Federal-Mogul 388A - standard precision, not Class 3 |
Timken 388A-3 imperial single-row tapered roller bearing cone — the inner ring together with its tapered rollers and cage. The mating cup (outer race) is a separate part number: Timken 382A.
388A — Timken imperial cone number. Matching cup: 382A. A complete single-row bearing is a 388A cone plus a 382A cup.
-3 — Timken precision Class 3, also written *3 or #3. Class 3 holds tighter bore and running-accuracy tolerances than standard Class 4.
Bearing Type: Tapered roller bearing cone. Number Of Rows: Single row. Bore Diameter: 2.2650 in (57.531 mm). Overall Width: 0.8640 in (21.946 mm). Precision Class: Class 3 (Timken). Bearing Material: High Alloy Steel. Closure Type: Open. Design Units: Imperial. Item Weight: 5.51 lb (2.499 kg). Unit Quantity: 1 Pc.
Effective Center Location: -0.12 in (-3.0 mm). Cone Backface Clear Radius: 0.14 in (3.600 mm). Cone Frontface Backing Diameter (da): 2.48 in (63 mm). Cone Backface Backing Diameter (db): 2.76 in (70 mm). Mating cup 382A: Outside Diameter 3.8125 in (96.838 mm), Width 0.6250 in (15.875 mm).
Ratings for the complete 388A/382A single-row assembly. Dynamic Load Rating C1: 108,000 N (24,200 lbf). Dynamic Load Rating C90: 28,000 N (6,280 lbf). Dynamic Axial Rating Ca90: 16,900 N (3,810 lbf). Static Load Rating C0: 107,000 N (24,100 lbf). K Factor: 1.65. e: 0.35. Y: 1.69. Class 3 precision suits pinion and gear shafts, machine tool spindles and matched pairs set to preload.
Unit Quantity: 1 Pc. One 388A-3 cone; cup 382A is a separate part.
Cone 388A cross numbers: Bower/BCA 388A, Koyo 388A, NTN 4T-388A and Federal-Mogul 388A, all standard precision; the 388A-3 shares their envelope with a Class 3 tolerance grade. Mating cup: 382A. Cup 382 is a related size. 388 without the A is a separate catalogue item.
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