| Bore Type | Straight |
| Bore Diameter | 0.787 Inch | 20 mm |
| Outside Diameter | 1.654 Inch | 42 mm |
|
Overall Height/Width
|
0.472 Inch | 12 mm |
|
Contact Angle
|
0° |
| Closure Type | Double Sealed |
| Enclosure Type | Non Contact Seal |
| Bearing Type | Tapered Roller Bearing |
| Internal Clearance | C5 |
| Material | Steel |
| HTC | 8482.10.50.68 |
|
Precision Class
|
ABEC 5 | ISO P5
|
 |
 |
| Max Dynamic Radial Load (with 90% reliability) | 9.4kN (2,113 lbf pound-force) |
| Max Static Radial Load | 5kN (1,124 lbf pound-force) |
| Max Dynamic Axial Load | 3.3kN (741 lbf pound-force) |
| Max Static Axial Load | 2.5kN (562 lbf pound-force) |
Back to Replacement Parts
3C Headstock Class 5 Bearing
Our Class 5 (C5) bearings are lifetime-lubricated and feature an adjustable preload for optimal performance. These precision bearings provide superior accuracy, tighter tolerances, smoother and quieter operation, and cooler running temperatures. The bearings are factory-set with a preload of .0002″, rated for continuous operation up to approximately 4,000 RPM. For higher-speed applications, up to 10,000 RPM, a slightly looser preload of .0003″ may be required.
We do not recommend customers attempt to replace the headstock bearings themselves. Proper bearing installation requires the use of specialized fixtures to ensure perfect spindle and bearing alignment.
If you are unable to press the bearings in yourself, you may return your headstock to our facility for professional replacement. Please contact our customer service department at kim@sherline.com to obtain an RMA number before sending your headstock in for service.
Note: Service fees apply.
Learn more about our specialized tools and procedures for setting the headstock bearing preload:
PDF: Replacing Headstock Bearings
Video: Setting the Headstock Bearing Preload
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Related products
Jeweler DOP Holder
Sherline Products, in collaboration with Bryan D. Drummond (Gem Cutter & Goldsmith), has designed this DOP Holder specifically for securely holding lapidary DOP sticks during gemstone cutting. If you already own one of our machines, the holder is designed to thread directly onto our ¾-16 headstock spindle nose. It will also be an essential accessory for our upcoming gem cutting machines.
Compatible with Ultra Tec® Dops This DOP Holder has been precisely engineered with tolerances and a keyed dop system designed for compatibility with Ultra Tec® brand dops which are used on their faceting machines. Many gem cutters use Ultra Tec equipment for flat faceting, and the keyed dop feature provides secure alignment and ease of use, making it a valuable addition to your setup. Sherline does not manufacture dops, but they can be purchased directly from Ultra Tec. Like Sherline, Ultra Tec products are high-quality and Made in the USA. Shop Ultra Tec Dops Features:- Made from 12L14 steel with electroless nickel plating for corrosion resistance
- Tapered body provides greater visual access to the stone during cutting
- ¼" dop hole with 10-32 set screw to secure the dop
- 3/32" locating pin for alignment of angle-cut dops
- Precision-machined with tight tolerances for a secure, accurate fit
- Keyed dop system ensures repeatable orientation and alignment
- Fully compatible with Ultra Tec® brand dops and machines
- High-quality construction - Made in the USA
