Shaft-to-Shaft Power Connection
Spline hub couplings are important components that connect two shafts and transmit torque. They use internal involute splines to mate with external splines on shafts, enabling power transmission and shaft-end connections. With 21 years of gear shaft experience, we have deep expertise in coupling spline machining and inspection. Internal involute spline modules range from 2 to 8 with teeth 20 to 120, using 30° pressure angle and accuracy Grade 7-9. Effective face widths range from 20 to 100 millimeters with outside diameters from Φ80 to Φ300 millimeters and overall thicknesses from 15 to 60 millimeters.
Specialized Internal Spline Inspection
Internal spline inspection represents the technical challenge of this product. Unlike external gears, internal splines cannot use base tangent length micrometers for measurement. Span measurement M values must be used to control tooth thickness. We provide span measurement M actual values with every batch. Additionally, internal tooth roundness and radial runout are critical inspection indicators, with radial runout controlled within 0.06 millimeters. If internal spline roundness exceeds limits, mating with the shaft external spline produces localized tight or loose areas, affecting transmission smoothness and potentially causing vibration.
Material Selection by Application
Material uses 40Cr with quenching and tempering treatment to HB 220-280. Working surfaces receive hardening treatment to HRC 48-56. For agricultural heavy-load applications, we recommend 20CrMnTi with carburizing and quenching for higher tooth surface hardness and better impact load resistance. Our complete inspection process covers every coupling, with dimensions and hardness fully verified before packaging and shipment.
Custom Manufacturing Support
We support custom manufacturing based on your drawings and samples. Before ordering, we provide free drawing review to verify span measurement M values and spline parameter reasonableness. During production, we regularly share real photos and inspection data with you. We offer a one-year warranty covering all products.
Technical Specifications Table
|
Parameter |
Range / Specific Requirements |
|
Internal Involute Spline Module |
2~8 |
|
Internal Involute Spline Teeth |
20~120 |
|
Pressure Angle |
30° |
|
Spline Accuracy |
7~9 |
|
Effective Face Width |
20~100mm |
|
Outside Diameter |
Φ80~Φ300 |
|
Overall Thickness |
15~60mm |
|
Inspection Indicators |
Span measurement M, internal tooth roundness, radial runout ≤0.06mm |
|
Material & Heat Treatment |
40Cr quenched & tempered HB 220~280, working surface hardened HRC 48~56; Agricultural heavy-load 20CrMnTi carburized |
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