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Deep Groove Ball Bearings: The Industry Default and When to Reach for Something Else
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Imperial single-row tapered roller bearing CONE ONLY (inner ring with rollers and cage), 2.0625 in / 52.388 mm bore, 0.8750 in / 22.225 mm inner-ring width. Mates cup 372A. The cup is a separate part and is not included. Sold as 1 Pc.
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3 in stock
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| MFR / Brand | Timken |
|---|---|
| Model | 377 W |
| Bearing Type | Tapered Roller Bearing Cone |
| ID | 2.0625 in |
| Material | Steel |
|---|---|
| Series | 375 |
| Base Number | 377 |
| Industry Terms | taper cone, inner race with rollers, TS cone, single cone |
| Application Types | Gear reducers, shaft-mounted drives, countershafts, conveyor head shafts, agricultural and construction drivetrains |
| Overall Width | 0.8750 in / 22.225 mm |
| Bore Shaft Size | 2.0625 in / 52.388 mm |
| Mpn Variants | 377W, 377-W, 377 W, 377, 377 cone, 377-372A |
| Compatible With Replaces | Mates with cup 372A (also 372). 377A is a related size, not an equivalent. |
| Dynamic Load Rating C1 | 23,400 lbf / 104,000 N |
| Dynamic Load Rating | 104,000 N / 23,400 lbf (C1) |
| Static Load Rating | 101,000 N / 22,700 lbf (C0) |
| Item Weight | 3.56 lb / 1.614 kg |
| Number Of Rows | Single row |
| Harmonization Code | 8482.20.00 |
| Design Units | Imperial |
| Bearing Material | Case-Hardened Steel |
| Part Number | 377W |
| Cone Part Number | 377W |
| 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 |
This is an imperial single-row tapered roller bearing cone — the inner ring with its tapered rollers and cage. It is one half of a tapered roller bearing. The mating cup (outer race) is a separate part number and is not included in this listing.
The base number is 377, a standard imperial cone; its matching cup is 372A (372 is also listed), so a complete single-row bearing is a 377 cone plus a 372A cup. The dimensions and ratings below are the published 377 values, which are what govern fit.
Cone bore (d): 2.0625 in / 52.388 mm. Inner ring width (B): 0.8750 in / 22.225 mm. Mating cup 372A outside diameter (D): 3.8125 in / 96.838 mm. Mating cup 372A width (C): 0.7500 in / 19.050 mm. Cone weight: 3.56 lb / 1.614 kg.
The ratings below are catalogue values for the complete 377/372A single-row assembly, not for the cone alone.
Dynamic radial rating C1 (1 million rev basis): 23,400 lbf / 104,000 N. Dynamic radial rating C90 (90 million rev basis): 6,070 lbf / 27,000 N. Dynamic axial rating Ca90: 3,520 lbf / 15,700 N. Static radial rating C0: 22,700 lbf / 101,000 N. K factor: 1.73. e: 0.34. Y: 1.77. Geometry factor Cg: 0.0816. Effective load centre: −0.15 in / −3.8 mm (inside the cone backface). Maximum shaft fillet radius cleared: 0.09 in / 2.300 mm. Shaft backing shoulder diameter, frontface (da): 2.28 in / 58 mm. Shaft backing shoulder diameter, backface (db): 2.44 in / 62 mm. Cup 372A housing backing shoulder: Da 3.56 in / 90.42 mm, Db 3.39 in / 86.11 mm; max housing fillet 0.06 in / 1.52 mm.
A K factor of 1.73 is the general-purpose middle of the tapered roller range: enough thrust capacity to handle helical gear reaction or a cornering load, enough radial capacity to be the main support, and predictable induced thrust for the opposing bearing. The narrow 0.7500 in cup keeps the axial envelope short for a 2.0625 in shaft, which is why the 372/377 pairing is a common choice in gear reducers and shaft-mounted drives where housing length is constrained.
This listing ships 1 Pc — one 377 cone. No cup, no spacer, no seal.
Press the cone on square, loading the backface only and never the rollers or cage. Keep the shaft shoulder within the da/db range. Note the mismatch worth planning for: the cone tolerates a 0.09 in shaft fillet but the mating 372A cup only a 0.06 in housing fillet, so the housing corner must be the sharper of the two. Set the end play or preload after the cup is fully seated.
377 is a dimensionally standardised imperial cone, so 377 cones from Timken, Koyo, NTN, Bower/BCA, SKF and Federal-Mogul interchange with one another and with any maker’s 372A cup. 377A is a related size, not an equivalent, and 372 versus 372A differ in cup detail — order the cup by number against your housing. A 377W ring marking should be read as a 377 for fitting purposes.
$144.56
12 in stock
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