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Tapered roller bearing single cone (inner ring with rollers and cage) for a 2.0000 in shaft, 1.28125 in inner-ring width, K factor 0.66. The NA prefix is the wider two-row cone width that pairs with a 55444D double cup. Cone only, no cup included. One piece.
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| MFR / Brand | Timken |
|---|---|
| MPN | NA55200 |
| Model | NA 55200 |
| Bearing Type | Tapered Roller Bearing Cone, Open |
| ID | 2.0000 in |
| OD | 140 mm |
| Width | 26 mm |
| Series | 55000 |
|---|---|
| Condition | New – Open box |
| Lubricant | Grease |
| Material | Case Carburized Steel |
| Base Number | 55200 |
| Industry Terms | taper roller cone, TS cone, inner ring assembly, cone and rollers, taper bearing inner, imperial taper cone |
| Common Misspellings | NA5520, N55200, NA-55-200, NA55200A, 55-200 |
| Application Types | Wheel ends, gearboxes, pinion shafts, heavy machinery, industrial drives |
| Condition Note | Made In USA, New Old Stock, We Have The Parts To Make Complete Timken Sets Or Assemblies For Any Part Number, Contact Us |
| Bore Shaft Size | 2.0000 in (50.8 mm) |
| Mpn Variants | NA55200, NA-55200, NA 55200, NA55200 Timken, 55200 (base number) |
| Manufacturer Status | Timken standard catalogue item |
| Compatible With Replaces | Timken TS single-row and TNA two-row tapered roller assemblies built on the 55200 cone |
| Additional Attributes | Dynamic axial rating Ca90 9,380 lbf (41,700 N); e factor 0.88; K factor 0.66; effective centre location 0.28 in (7.1 mm); max shaft fillet radius 0.09 in (2.300 mm); shaft backing shoulder diameter db 2.72 in (69 mm); cage location rel. backface Aa 0.128125 in, rel. frontface Ab -0.0640625 in |
| Min Temp | -54°C |
| Cage Type | Stamped |
| Dynamic Load Rating | 185 kN / 41600 lbf |
| Static Load Rating | 214 kN / 48000 lbf |
| Precision Rating | Class 2 / Class 0 |
| Rolling Elements | Tapered Rollers |
| Max Temp | 120°C |
| Item Weight | 1.35 lbs |
| Cage Material | Steel |
| Limiting Speed | 4000 rpm |
| Number Of Rows | 1 |
| Bore Type | Straight |
| Snap Ring Included | No |
| Harmonization Code | 8482.20.00 |
| Design Units | Imperial |
| Bearing Material | Case-carburised bearing steel |
| Internal Clearance | C3 |
| Part Number | NA55200 |
| Cross Reference 1 | 55444D Timken double cup — the matching cup for this NA-width cone |
|---|---|
| Cross Reference 2 | 55437 Timken single cup, 4.3750 in OD |
| Cross Reference 3 | 55443 Timken single cup |
| Cross Reference 4 | 55200 — standard single-row cone, same bore and taper but 1.0594 in wide, carried as a dimensional cross-reference only |
| Cross Reference 5 | Bower 55200 |
| Cross Reference 6 | SKF 55200 / NTN 55200 / Koyo 55200 / FAG 55200 / Bower 55200 same-envelope cones |
A Timken NA55200 tapered roller bearing single cone — the inner ring complete with its tapered rollers and stamped steel cage. It is one half of a tapered roller bearing; the mating cup (outer race) is a separate part number and is not included here.
55200 is the base cone number in Timken’s imperial 55000 series. The NA prefix designates a cone ground to the wider inner-ring width used in two-row (TNA) arrangements rather than the standard single-row 55200. That is why the inner-ring width is 1.28125 in here instead of the 1.0594 in of a plain 55200 — both numbers are correct for their own part, so check the prefix before ordering.
Bore (d): 2.0000 in / 50.8 mm
Inner ring width (B): 1.28125 in / 32.544 mm
Dynamic radial rating C90 (90 million revs): 6,200 lbf / 27,600 N
Dynamic axial rating Ca90: 9,380 lbf / 41,700 N
e factor 0.88, K factor 0.66
Effective centre location: 0.28 in / 7.1 mm
Maximum shaft fillet radius: 0.09 in / 2.300 mm
Shaft backing shoulder diameter (db): 2.72 in / 69 mm
Timken rates imperial tapered roller bearings as C90 and Ca90 at 90 million revolutions rather than the ISO one-million-revolution C, so these figures are not directly comparable with the C values quoted for metric ball and roller bearings. The K factor of 0.66 is the ratio Timken uses to convert thrust to equivalent radial load; a K in this range means the bearing carries a substantial thrust component alongside its radial load, which is the whole reason for choosing a taper over a ball bearing on wheel ends, gearboxes and pinion shafts.
One cone assembly ships. It is not a matched set and no cup is supplied. Timken’s related double cup for this cone is the 55444D.
Cones are an interference fit on the shaft and are normally pressed or induction-heated on, driving only on the backface. Do not mix a used cup with a new cone or vice versa — wear patterns are mated. Respect the 0.09 in maximum shaft fillet radius and the 2.72 in backing shoulder diameter or the cone will not seat squarely.
The 55200 base number is carried by most tapered roller manufacturers, so 55200-series cones from SKF, NTN, Koyo, FAG and Bower share the envelope. Match the prefix as well as the base number: a plain 55200 is dimensionally different in width from this NA55200. Matching cups in the family include 55437 and 55443 as single cups and 55444D as the double cup.
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