Inner Diameter: 45mm
Outer Diameter: 60mm
Width: 9mm
Material: Gcr15
Precision: P4, P5, P6
Lubrication: standard grease
Dynamic Load Rating (Cr): 12.89
Static Load Rating (Cor:): 11.55
3E809KAT2 bearing is a precision-engineered rolling bearing commonly used in harmonic drive speed reducer.
For this bearing
Inner Diameter: 45mm
Outer Diameter: 60mm
Width: 9mm
Material: Gcr15
Precision: P4, P5, P6
Lubrication: standard grease
Dynamic Load Rating (Cr): 12.89
Static Load Rating (Cor:): 11.55
Thin and Flexible Outer Ring
The outer ring of the 3E809KAT2 bearing is very thin. It is easy to deform in the radial direction. Before installation, it is round. After installation, it becomes oval.
Mainly Bears Alternating Stress
The flexible bearing mainly bears alternating and cyclic stress during operation. It is suitable for high-frequency deformation.
High-Quality Materials
The inner ring, outer ring, and rolling elements are made of high-carbon chromium bearing steel. This ensures high load capacity and good wear resistance. The cage is made of one-piece nylon, which reduces weight and noise.
Excellent Performance in Harmonic Drive
3E809KAT2 bearing is the core part of the harmonic drive gearbox. It uses its elastic deformation to achieve a high reduction ratio and high transmission accuracy.
Compact Structure and Light Weight
The bearing has a thin wall, small size, and light weight. This helps to reduce the overall size of the mechanism and improve system efficiency.
Smooth Transmission and Low Noise
When used with harmonic drive, the flexible bearing runs smoothly and quietly. It is suitable for applications that require high precision and low noise.
| Model Number | ID (mm) | OD (mm) | Width B(mm) | Radial Deformation Max(mm) |
| E904KAT2 | 18.8 | 25 | 4 | 0.2 |
| 3E905KAT2 | 24 | 32 | 5 | 0.2 |
| 3E806KAT2 | 30 | 40 | 6 | 0.3 |
| 1000907AKIT2 | 35.8 | 48.2 | 8 | 0.3 |
| 3E907KAT2 | 37 | 50 | 8 | 0.3 |
| 3E809KAT2 | 45 | 60 | 9 | 0.4 |
| 1000809AKIT2 | 45.7 | 61.8 | 9.5 | 0.4 |
| 10008810AKT2 | 48 | 63 | 9.7 | 0.4 |
| 1000912AKT2 | 60 | 80 | 12 | 0.5 |
| F14 | 25.07 | 33.896 | 6.095 | 0.2 |
| F17 | 30.3 | 41.722 | 6.16 | 0.3 |
| F20 | 35.56 | 49.073 | 7.24 | 0.3 |
| F25 | 45.212 | 61.341 | 9.015 | 0.4 |
| F32 | 58.928 | 79.756 | 11.81 | 0.5 |
| M14 | 25.07 | 33.896 | 6.095 | 0.2 |
| M17 | 30.3 | 41.722 | 6.16 | 0.3 |
| M20 | 35.56 | 49.073 | 7.24 | 0.3 |
| M25 | 45.212 | 61.341 | 9.015 | 0.4 |
| M32 | 58.928 | 79.756 | 11.81 | 0.5 |
Comparison helps when dimensional fit is only part of the decision and load direction, sealing, clearance, speed, temperature, or repeat-order stability still need to be confirmed. Reviewing one or two nearby options early usually reduces sourcing mistakes later.
Buyers normally confirm the part reference, main dimensions, application, speed range, operating environment, sealing needs, and any packaging or marking requirements. That gives the supplier a cleaner basis for confirming availability and suitable alternatives.
A quick review of Other Ball & Roller Bearings, one more commercial destination, and one practical guide usually saves time. That combination helps separate simple replacement orders from jobs that still need fit or application review.
Because it makes later decisions faster. When sizing notes, application cues, and nearby options stay close to the product, engineering, purchasing, and maintenance teams can revisit the same logic without starting the review from zero.
1. Sea shipping for mass cargos (GW > 500KGS)
2. Air shipping (GW between 100KGS – 500 KGS)
3. Express, such as DHL, TNT, Fedex, UPS for small cargos ( GW < 100KGS)
4. If you have shipping agent in China, we can send goods to your shipping agent's warehouse
We accept T/T, W/U, PAYPAL, L/C etc
Buyer FAQ
Confirm the bearing number, bore size, outside diameter, width, seal or shield type, cage material, clearance, precision level, quantity, and application. These details help prevent a size match from becoming a performance mismatch.
Yes. Replacement and repeat orders are easier when the original marking, measured dimensions, photos, application, and quantity are available. If the marking is unclear, the team can start from the size and working condition.
This item is handled within the Other Ball & Roller Bearings family. Comparing the family page can help buyers review similar sizes, seal options, load direction, and related bearing choices before requesting a quote.
Price and lead time can change with quantity, stock availability, precision grade, clearance, material, cage, seal or shield type, lubrication, packaging, and whether the order needs standard matching or custom production.
Inspection can include material review, dimensional measurement, noise and vibration checks, surface and crack checks, visual review, and packaging inspection according to the confirmed order requirements.
Need help checking fit, price, or lead time? Request a bearing quote
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