Products for USB Sensing and Control
Products for USB Sensing and Control

Spiral Beam Coupling 4-4mm

ID: 3420_0

This aluminium beam coupling connects two 4mm shafts together with set screws.


This beam type coupling can be used to connect two 4mm shafts together. Each shaft is held in place by two set screws, allowing for easy installation. The spiral cut design allows for up to 2° of bending from angular misalignment and up to 0.12mm eccentric misalignment.

If you're having trouble with slipping, you can file a groove into the shaft where the set screws hold it in place. You can also use a Loctite adhesive on the set screws to ensure that they remain in place.

Product Specifications

Physical Properties
Manufacturer Part Number CL1-17-4mm
Material Aluminium
Coupling Rated Torque 3.1 kg·cm
Coupling Rated Speed 12000 RPM
Torsional Stiffness 65 N·m/rad
Shaft Angularity Tolerance
Shaft Eccentricity Tolerance 120 μm
Inner Diameter 4 mm
Screw Thread Size M3
Weight 12 g
Customs Information
Canadian HS Export Code 8483.60.00
American HTS Import Code 8483.60.80.00
Country of Origin CN (China)


If you want to be able to measure the speed that a rotary system is moving at, you can use this 4mm shaft coupler to connect to any of these encoders:

Product Physical Properties Encoder Properties
Image Part Number Price Shaft Diameter Encoder Resolution Encoder Speed Max
3530_1 $50.00 4 mm 360 CPR 3000 RPM

More 4mm shaft couplings:

Product Physical Properties
Image Part Number Price Inner Diameter Material Coupling Rated Torque Coupling Rated Speed Torsional Stiffness
TRM4310_0 $3.00 4 mm Aluminum 35.7 kg·cm 12000 RPM
TRM4332_0 $3.50 4 mm Aluminium 10 kg·cm 8000 RPM 110 N·m/rad