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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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Tapered roller bearing cone, 2.0625 in (52.388 mm) bore x 0.8750 in (22.225 mm) wide, Class 3 precision, inch series. Mates with Timken cup 372A. 1 Pc.
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| MFR / Brand | Timken |
|---|---|
| MPN | 377-3 |
| Model | 377 #3 |
| Bearing Type | Tapered Roller Bearing Cone |
| ID | 2.0625 in |
| Series | 372/377 imperial tapered roller series |
|---|---|
| Material | Case-Hardened Steel |
| Base Number | 377 |
| Industry Terms | taper cone, inner race with rollers, TS cone, single cone, precision taper cone |
| Application Types | Pinion and gear shafts, gear reducers, shaft-mounted drives, machine tool spindles, conveyor head shafts |
| Overall Width | 0.8750 in / 22.225 mm |
| Bore Shaft Size | 2.0625 in / 52.388 mm |
| Mpn Variants | 377-3, 3773, 377 *3, 377 #3, 377, 377W, 377-372A |
| Compatible With Replaces | Mates with cup 372A (also 372). Standard-precision 377 shares the envelope but not the Class 3 grade. 377A is a related size with a different envelope. |
| Precision Class | Class 3 |
| Precision Rating | Class 3 |
| Number Of Rows | Single row |
| Harmonization Code | 8482.20.00 |
| Design Units | Imperial |
| Bearing Class | Class 3 |
| Bearing Material | Case-hardened steel |
| Part Number | 377-3 |
| Cone Part Number | 377 |
| Cone Width | 0.8750 in |
| Cone Backface To Clear Radius | 0.09 in |
| Cone Frontface Backing Diameter | 2.28 in |
| Cage Cone Frontface Clearance | 0.09 in |
| Cage Cone Backface Clearance | 0.01 in |
| Effective Center Location | -0.15 in |
| Common Misspellings | Timkin 377-3; Timken 3773; Timken 377 3; Timken 377*3; Tymken 377-3 |
| Cross Reference 1 | Timken 377 - standard class |
|---|---|
| Cross Reference 2 | Koyo 377 - standard class |
| Cross Reference 3 | NTN 377 - standard class |
| Cross Reference 4 | Bower / BCA 377 - standard class |
| Cross Reference 5 | SKF 377 - standard class |
Timken 377-3 is an imperial single-row tapered roller bearing cone: the inner ring with its tapered rollers and cage. Cone only, no cup. Unit Quantity: 1 Pc. Bore Diameter: 2.0625 in (52.388 mm). Cone Width: 0.8750 in (22.225 mm). Precision Class: Class 3. Mating cup: Timken 372A (372 also listed).
377 — Timken imperial cone number, 2.0625 in bore.
-3 (also written *3 or #3) — Timken precision Class 3.
Bore Diameter: 2.0625 in (52.388 mm). Cone Width: 0.8750 in (22.225 mm). Precision Class: Class 3. Material: Case-Hardened Steel. Rolling Elements: Tapered Roller. Number Of Rows: 1. Series: 372/377 imperial tapered roller series. Harmonization Code: 8482.20.00. Unit Quantity: 1 Pc.
Cone Backface To Clear Radius: 0.09 in (2.3 mm). Cone Frontface Backing Diameter: 2.28 in (58 mm). Cone Backface Backing Diameter: 2.44 in (62 mm). Effective Center Location: -0.15 in (-3.8 mm). Cage-Cone Frontface Clearance: 0.09 in. Cage-Cone Backface Clearance: 0.01 in.
Mating cup per Timken: 372A (372 also listed). Cup 372A: outside diameter 3.8125 in (96.838 mm), width 0.7500 in (19.050 mm). Standard-precision 377 cones share this envelope but not the Class 3 grade: Timken 377, Koyo 377, NTN 377, Bower / BCA 377, SKF 377. Timken 377A is a related size with a different envelope.
2.0625 in (52.388 mm) bore and 0.8750 in (22.225 mm) cone width.
Timken precision Class 3. The suffix is also written *3 or #3.
Timken cup 372A. The 377-3 is the cone only and does not include a cup.
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