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Koyo 687 is a single-row tapered roller bearing cup from the inch series. It has a 7 mm bore and 14 mm outside diameter. This cup is designed for use with a matching cone in applications such as gearboxes and axle housings.
MODEL 687
$102.24 Each
Prices are subject to change
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Basic Number
687
Bore
4 in / 101.6 mm
Brand
KOYO
Flange Outside Diameter
0 Inch / 0 Millimeter
Inch - Metric
Inch
Number of Tapered Rows
Single Row
Outside Diameter
0 Inch / 0 Millimeter
Precision Class
Standard
Type
Tapered Roller Bearings
UNSPSC
31171527
Width
1.625 Inch / 41.275 Millimeter
| Bearing No. | 687 | |
| Boundary dimensions(mm) | d | 7 |
| D | 14 | |
| B | 3.5 | |
| r(min) | 0.15 | |
| Basic load ratings(kN) | Cr | 1.45 |
| C0r | 0.51 | |
| Fatigue load limit(kN) | Cu | 0.010 |
| factor | f0 | 14.2 |
| Limiting speeds(min-1) | Grease lub. | 45000 |
| Oil lub. | 54000 | |
| Mounting dimensions(mm) | da(min) | 8.2 |
| Da(max) | 12.8 | |
| ra(max) | 0.15 | |
| (Refer.)Mass(g) | 2.0 |
How do I choose the right type of bearing for my application?
Start with the load and how it’s applied. You need to know if you’re dealing with radial loads, axial loads, or a mix of both. Then look at speed, operating environment, and space constraints. For example, ball bearings are great for high speed and lighter loads, while roller bearings handle heavier loads but usually at lower speeds. If there’s contamination, moisture, or heat involved, you may need sealed bearings or specific materials. In most cases, the right choice comes down to matching load type, speed, and environment to the bearing design.
