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Timken NA56424A-3 tapered roller bearing cone, 4.2500 in / 107.950 mm bore, 1.4375 in wide, Class 3 precision. Cone only; the 56650 cup is a separate part.
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| MFR / Brand | Timken |
|---|---|
| MPN | NA56424A-3 |
| Model | NA 56424 A #3 |
| Bearing Type | Tapered Roller Bearing Cone |
| ID | 4.2500 in |
| Series | 56400 (Timken imperial TS tapered single) |
|---|---|
| Base Number | NA56424A |
| Industry Terms | taper roller cone, inner cone, TRB cone, inner race and roller assembly, heavy taper bearing inner |
| Common Misspellings | Timkin NA56424A-3, NA 56424 A 3, NA56424a*3, taper roler cone 56424 |
| Application Types | Mill stands, large gearbox shafts, kiln and conveyor pulleys, press drives, heavy industrial shafting |
| Bore Shaft Size | 4.2500 in / 107.950 mm |
| Mpn Variants | NA56424A-3, NA56424A 3, NA-56424-A-3, NA56424A *3, NA56424A3, NA56424A, 56424A, 56424 |
| Manufacturer Status | Timken active industry number |
| Compatible With Replaces | Applications calling NA56424A cone with 56650 cup |
| Number Of Rows | 1 |
| Harmonization Code | 8482.20.00 |
| Part Number | NA56424A-3 |
| Cone Part Number | NA56424A |
| Cone Width | 1.4375 in |
| Cone Backface To Clear Radius | 0.06 in |
| Cone Frontface Backing Diameter | 4.57 in |
| Cross Reference 7 | Timken 56425 (related, single-row cone) |
|---|
A Timken NA56424A single tapered roller bearing cone in Class 3 precision: the inner ring together with its tapered roller set and cage, one half of a tapered roller bearing. Cone only. The matching cup is the Timken 56650. At a 4-1/4 in bore this is a heavy industrial cone, used in mill stands, large gearbox shafts, kiln and conveyor pulleys and press drives.
NA: Timken prefix marking a cone furnished for two-row and TDO service. 56424: cone number in the 56400 sequence, mating the 56650 cup. A: design revision within the sequence. -3: Timken precision Class 3, tighter bore, width and runout than the standard Class 4 / K grade. Cartons stamp this with a leading asterisk, so the part also reads NA56424A *3 and NA56424A3.
Manufacturer: The Timken Company. Part Number: NA56424A-3. Base Number: NA56424A. Cone Part Number: NA56424A. Bearing Type: tapered roller bearing cone, single row, TS series. Series: Timken imperial TS tapered single, 56400 sequence. Bore (d): 4.2500 in / 107.950 mm. Cone Width (B): 1.4375 in. Bore Type: straight. Number of Rows: 1. Precision Class: Timken Class 3. Bearing Class: Class 3. Cage Type: stamped one-piece roller cage. Cage Material: steel. Bearing Material: case-carburized steel. Closure Type: open. Cone Backface To Clear Radius: 0.06 in. Cone Frontface Backing Diameter: 4.57 in. Design Units: imperial (inch). Harmonization Code: 8482.20.00. Mating Cup: 56650, outside diameter 6.500 in, cup width 1.063 in.
Tapered rollers carry heavy combined radial and one-way thrust because the roller and raceway apexes converge on a common point, so they are used in opposed pairs and the pair’s axial setting is established at assembly. Class 3 tightens bore, width and runout so that setting is repeatable, which is what large gear drives and roll positions need to hold a contact pattern.
Cone assembly only: inner ring, rollers and cage as one non-separable unit. Unit Quantity: 1 Pc. The mating 56650 cup is a separate part number.
New old stock with surface staining. Raceways and rollers otherwise unused.
The standard assembly is NA56424A/56650, and the related two-row form is NA56425SW/56650CD. The shortened trade forms 56424A and 56424 point at this cone. The 56425 is the single-row cone in the same 4.2500 in bore and 1.438 in cone width on the same 56650 cup. Timken NA56424A without the -3 suffix is the same cone in standard Class 4 / K precision.
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