store Timing Belt Pulleys and V-Belt Sheaves: Matching Belt Drive Components Correctly
Belt drives may appear simple, consisting of two wheels and a belt for power transfer.
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Tapered roller bearing cone and cup set, 2.2500 in (57.150 mm) bore, 5.5130 in (140.030 mm) OD, 1.4375 in wide, 171,000 N dynamic rating. Inch series.
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| MFR / Brand | NTN |
|---|---|
| MPN | 78225/78551 |
| Model | 78225 78551 |
| Bearing Type | Tapered Roller Bearing |
| ID | 2.2500 in (57.150 mm) |
| OD | 5.5130 in (140.030 mm) |
| Width | 1.4375 in (36.512 mm) |
| Total Width | 1.4375 in (36.512 mm) assembled |
|---|---|
| Mpn Variants | 78225/78551, 78225-78551, 78225 78551, 4T-78225/78551, 78225, 78551 |
| Material | Case carburized steel |
| Dynamic Load Rating | 171,000 N |
| Static Load Rating | 212,000 N |
| Rolling Elements | Tapered Roller |
| Item Weight | 2.680 kg (5.909 lb) |
| Limiting Speed | 2,600 rpm grease |
| Bearing Material | Case carburized steel |
| Closure Type | Open |
| Cross Reference 1 | Timken 78225/78551 |
|---|
NTN 78225/78551 inch-series single-row tapered roller bearing set: 78225 cone (inner ring with rollers and cage) and 78551 cup (outer ring). Bore Diameter: 2.2500 in (57.150 mm). Outside Diameter: 5.5130 in (140.030 mm). Total Width: 1.4375 in (36.512 mm) assembled. Cone Width: 1.3085 in (33.236 mm). Cup Width: 0.9260 in (23.520 mm). Rolling Elements: Tapered Roller. Bearing Material: Case carburized steel. Closure Type: Open.
78225 — NTN cone number, 2.2500 in bore.
78551 — NTN cup number, 5.5130 in OD, the matching outer ring for the 78225 cone.
Dynamic Load Rating: 171,000 N. Static Load Rating: 212,000 N. Limiting Speed: 2,600 rpm grease. Item Weight: 2.680 kg (5.909 lb). Axial load factor e: 0.87. Axial load factor Y2: 0.69. The steep roller angle gives high thrust capacity alongside radial load; the bearing locates in one direction and is normally paired with a second opposed bearing on the shaft.
Effective load centre a: 8.4 mm (0.33 in). Cone fillet radius r: 2.3 mm. Cup fillet radius R: 3.5 mm. Shaft abutment diameters: 83.0 mm and 77.0 mm. Housing abutment diameters: 132.0 mm and 117.0 mm.
Unit Quantity: 2 Pcs. One 78225 cone and one 78551 cup forming a complete bearing.
Cross-Reference: Timken 78225/78551 uses the same ABMA inch cone and cup numbers and envelope.
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Belt drives may appear simple, consisting of two wheels and a belt for power transfer.
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Our team can locate, cross-reference, and source all parts.
Our team can locate, cross-reference, and source all parts.
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