Koyo 636-ZZ Deep Groove Ball Bearing, Metal Shielded (ZZ), 6 x 22 x 7 mm
Out of stock
This Koyo miniature deep groove ball bearing (shielded, 630 series) is built on the most popular rolling bearing type. Deep, uninterrupted raceway grooves in the inner and outer rings carry radial load and a certain degree of axial load in either direction, at high speed. It carries a metal shield on each side (ZZ type) and is pre-lubricated, so no greasing is needed.
The range has 2 sizes, with bores from 6 to 8 mm, normal (CN) radial internal clearance and boundary dimensions to JIS B 1512. Koyo bearings are made by JTEKT Corporation.
Where this product is used
- Automotive: transmissions, electrical devices, and truck and trailer equipment
- Off-highway: construction equipment, agricultural equipment and railway rolling equipment
- Electrical equipment: standard motors and domestic electric appliances
- Measuring and medical instruments
- General industrial equipment
Features
- Deep, uninterrupted raceway grooves carry radial load and a certain degree of axial load in either direction
- Metal shield (ZZ) on both sides: non-contact, with small friction torque and good high speed performance
- Boundary dimensions to JIS B 1512, tolerances to JIS B 1514-1
- Basic dynamic load ratings 3.3 to 4.55 kN and static 1.35 to 1.95 kN depending on size
- Standard cage by size: polyamide moulded
Key specifications
| Specification | Detail |
|---|---|
| Bearing type | Single row deep groove ball bearing |
| Series | 630 |
| Sealing | Metal shields (ZZ), both sides, non-contact |
| Radial internal clearance | Normal (CN) |
| Bore diameter d | 6 to 8 mm |
| Outside diameter D | 22 to 28 mm |
| Width B | 7 to 9 mm |
| Basic dynamic load rating Cr | 3.3 to 4.55 kN |
| Basic static load rating C0r | 1.35 to 1.95 kN |
| Limiting speed, grease lubrication | 26,000 to 31,000 min-1 |
| Limiting speed, oil lubrication | 32,000 to 37,000 min-1 |
| Operating temperature (standard type) | -30°C to +110°C |
| Dimensions and tolerances | JIS B 1512 (boundary dimensions), JIS B 1514-1 (tolerances) |
| Standard cage | Polyamide moulded, depending on size |
| Brand | Koyo (JTEKT) |
Available sizes
| Designation | Bore d (mm) | Outer D (mm) | Width B (mm) | r min (mm) | Cr (kN) | C0r (kN) | Speed, grease (min-1) | Speed, oil (min-1) |
|---|---|---|---|---|---|---|---|---|
| 636-ZZ | 6 | 22 | 7 | 0.3 | 3.3 | 1.35 | 31,000 | 37,000 |
| 638-ZZ | 8 | 28 | 9 | 0.3 | 4.55 | 1.95 | 26,000 | 32,000 |
Selecting the right option
Select by bore d first, then check the outside diameter D and width B in the table against your housing.
The basic dynamic load rating Cr relates to bearing life under rotating load, and the basic static load rating C0r to heavy or slow-turning duty. Compare the limiting speed for your size with the shaft speed. The speeds shown are the grease lubrication limits.
The ZZ shield is a non-contact type, with small friction torque, good high speed performance and good grease and dirt sealing. JTEKT rates its water resistance as economical, so choose a rubber sealed bearing where water is present.
Shielded and sealed bearings are designed for use with the inner ring rotating. Contact AIMS Industrial before using one with the outer ring rotating.
Fitting and use
Fit the ring that has the interference fit first, and press only on that ring, never through the balls.
Do not relubricate: the bearing is pre-lubricated with an appropriate volume of grease. The standard type runs from -30°C to +110°C.
Where axial load is large, make the shaft shoulder and housing shoulder larger than usual.
Related products
Also available from Koyo: the 6900 shielded range, the 6000 shielded range, the 6200 shielded range and the 6300 shielded range.
Couldn't load pickup availability
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6 x 22 x 7mm bearing
Model Number: 636-ZZ/KOYO
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8 x 28 x 9mm bearing
Model Number: 638-ZZ/KOYO
