Split pin

A cotter pin is a safety element in machine and vehicle construction. It is used to secure the position of connected components in a direction which is not the main loading direction in operation. For example, (crowns ) nuts are secured against rotation axes or against displacement.

Commercial designation and classification

In the technical parts trading pins are usually not listed under security elements, but under pins. Cotter splint among the detachable connections.

Use: A) normal sapwood B) secured Splint C) spring plug D) Splintquerschnitt ( Standardsplint )

Cotter pin in the castle nut

Standardsplint (EN ISO 1234)

Standardsplinte for general use are standardized according to EN ISO 1234. Before that was DIN 94

Cotter pins are made of wire with semi-circular cross-section. The two legs of different lengths are parallel to one another is pressed to form a round cross section with a fixed diameter in the standard. At one end of the wire to an approximately circular ring-shaped loop, the pin head, also with standardized dimensions, compressed.

Spring plug (DIN 11024 )

A spring plug, in the vernacular also split pin, is a reusable, self-locking pin. It is not like the Standardsplint of cleaved cross section, but engages, due to the resilient action of the material. These pins are standardized in DIN 11024.

Linch pin ( linch pin, DIN 11023 )

For special requirements come from constructive or security special shapes such as linchpins in accordance with DIN 11023 or Rohrklappsplinte in various designs used. In its basic form it consists of a spring steel bracket, the nut, bolt or screw covers in addition and a prism-shaped body in which the wire bracket is pivotally mounted. The legs are crossed when backing up with your own bow and act as self-locking. Linchpins are often used to secure shafts and pipes, which should not be exceeded at the maximum allowable values ​​for the surface pressure: where maximum values ​​apply for linchpins according to DIN standard of 350 N / mm ² at pins with up to 8 mm in diameter and 420 N / mm ² in those with up to 10 mm diameter.

Special shapes

• Fokkernadel

Furthermore, there are also various, non-standardized Splintformen for special applications.

Materials

As the materials of adequate strength, but tough metals such as iron, steel or non-ferrous alloys (with or without surface coating ) are used. Most often bare, tough steel is used. For the self-locking pins spring steels are used.

Use and handling of split pins

Since changing the material structure at securing and releasing, Standardsplinte may 1234 not be used for safety reasons after an assembly and disassembly again according to EN ISO. They must be replaced with new parts. Diameter of sapwood and associated hole ( pinhole ) must be coordinated. Together they form a loose fit. The sapwood must be easily -through. The legs are bent up against each other after passing Plug ( spread ). You may be shortened by cutting. But in no case the use is allowed to short pins; the length should be about twice the length of the bore.