HUB ShaftCoupler DCNC-D40-L65-B12.7mm (1/2“) with 5mm Keyway

These shaft couplings are very high-quality servo couplings. They can handle very high torque and have absolutely no backlash. We use these couplings for Leadshine servomotors NEMA34 in the imperial size variants, these have 1/2 inch shafts, which is 12.7mm. See the PDF manual and DXF drawings for technical details. Combinations of different shaft diameters are possible. For example, a 12.7mm hub for the stepper-motor and an 12mm hub for the ballscrew. A spider is required for every two hubs.

This is a special version of the shaft coupling. In addition to the clamp coupling, it also has a keyway. Generally, we oppose the use of keyways in CNC applications because they always end up twisting and loosening due to the constant back and forth movement. A clamp coupling, like the one we've been selling at DamenCNC for years, is a much better coupling because it always has maximum surface area in contact with the coupling and therefore will never twist loose. However, we kept getting questions about whether we could also make a clamp coupling with a keyway. After all, all Leadshine stepper motors and Delta servo motors also have these integrated into the motor shaft. The version we currently sell is designed for a specific application. The idea is that your friction/clamp coupling will function 99.9% of the time. In the event of extreme overload, or if someone forgets to tighten the clamp coupling, the keyway will do its job. So, consider it a backup or failsafe. We also deliberately incorporated a loose fit on the keyway. This allows you to easily fit it over the motor shaft without needing hammers or other tools. This is undesirable, as the encoders cannot withstand the impact.

Made in Holland: We have been producing these shaft couplings in the Netherlands for years, and the spiders are also made in the Netherlands. This allows us to guarantee high quality and short delivery times.

Component features:

• Bore: 12.7mm H7 (1/2 inch)
• Keyway: 5mm D10 (loose fit, free fit)
• Made in Holland: We have been producing these couplings in the Netherlands for years, and the spiders are also made there.
• A complete coupling consists of two hubs and one spider; any combination of bores can be made. In the "Compatible Hubs" tab, you can see which hubs and spiders are compatible with this coupling. This allows you to create a complete shaft coupling.
• Multiple bore sizes in stock, or a custom bore made on our CNClathe
• The bore is available with a tolerance of 8 to 25 mm H7
• Custom sizes available upon request
• Compensates for axial, radial, and angular errors
• Easy to maintain
• 40 mm diameter, length 65 mm (complete assembly)
• Dismountable for easy assembly
• See the PDF manual and 3D STEP drawings for details
• Nominal torque 17 Nm (Tkn)
• Maximum torque 34 Nm (Tkmax)
• Includes screw: M5x16 DIN912
• Tightening torque of the screw: 5-8 Nm
• Moment of inertia per hub (10-3 kg/m²): 0.015
• Weight: 95 grams per hub
• Maximum allowable RPM: 5000
• NOTE: Shaft couplings are not balanced!