connecting shafts with splines to spn standart

SPN splines are positive-locking connecting elements for shafts and hubs. Common standards are DIN 5480 with involute splines, DIN 5481 with serrated splines or ANSI B92.1, which are frequently used in aviation. Their advantages: simple installation and high safety factors to prevent slippage.

Connecting shafts with splines are mechanical components that are used in various industrial applications. They are made of high-strength steel and are equipped with precise teeth that enable the safe transmission of torque between two rotating parts.

The spline ensures a reliable connection and enables easy assembly and disassembly for maintenance work. Due to their robust design, splines can withstand high torques and allow axial movement.

The diameter of the shaft depends on the size of the parts to be connected and the required torque. The length of the shaft is determined by the distance between the components to be connected.

The module of the spline indicates the distance between the teeth and influences the power transmission capacity of the shaft.

The tooth width affects the strength of the connection and should be designed according to the load. The tooth height and the number of teeth also influence the stability of the connection and should be sufficiently dimensioned to transmit the torque.


For example with a DIN 5480:

A shaft with hub and gear forms a basic mechanical unit that is used in many applications to transmit torque. The shaft is a cylindrical component that enables rotational movements between the various parts of a machine. There is a hub on the shaft that serves as a fastening element to drive the gear wheel. The machine element to be driven, e.g. a gear wheel, consists of a circular disk with protruding teeth that can mesh with the teeth of an adjacent gear wheel.

As with spur gears, DIN 5480 also refers to module, number of teeth, pitch circle, root circle and tip circle. The pressure angle is usually 30°. The tolerance between the shaft and hub gearing is determined by the external requirements.

Source: Shaft-hub connections | SpringerLink, p. 509

Hirth gearing

[Translate to EN:] Hirthverzahnung

Hirth gearing enables precise positioning and repeat accuracy when connecting components, especially in rotating applications such as machine tools, gears and other precision mechanisms.

The Hirth coupling consists of a ring-shaped toothing with serrated teeth.

The teeth are interrupted, which means that there are free sections between the teeth. The Hirth angle between the interrupted teeth influences the rigidity and load-bearing capacity. The toothing ensures a rigid connection between the components. Overall, Hirth serration is a highly precise and reliable method of form-fit connection of components in mechanical engineering, enabling accurate positioning and fixing.

performance overview hubs

Manufacturing process roll formed, profile broached
Standarts DIN 5480, DIN 5481, ANSI B92.1
Module 0,4-6 mm
Number of teeth 5-150
Tooth width up to 87 mm
Pitch circle diameter up to 300 mm

Performance overview shafts

Manufacturing process hobbed
Standarts DIN 5480, DIN 5481, ANSI B92.1
Module 0,2-6 mm
Number of teeth 5-150
Tooth width up to 400 mm
Pitch circle diameter up to 300 mm

Your contact for SPN splines

Contact Person

Anton Lösch

Telephone: +49 9081 214-134

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