Save by buying parallel machine keys direct from the manufacturer

CTS manufacturers parallel machine keys and sells direct to you. By buying from the manufacturer, not an online distributor, you get parallel machines keys at a much lower cost.

We will email you a price quote -- just add the kinds of machine keys you need to a shopping cart on this site and click the Request a Quote button.

CTS makes DIN-6885-A, DIN-6885-B, and DIN-6885-AB parallel machine keys in the sizes shown on this website, or in any custom size or material you need — just tell us your specifications using our email form.

  • Both Ends Round DIN-6885-A

    Both Ends Round DIN-6885-A
    CTS manufactures DIN-6885-A, ISO 2491 A, ANSI b17.1-1967 and BS 46 Type A double-round machine keys in S45C and SS304 or any metal to your specification. Click to see parallel key sizes; any custom size can be manufactured.
  • Both Ends Square DIN-6885-B

    Both Ends Square DIN-6885-B
    DIN-6885-B, ISO 2491 B and BS Type B Square End Machine Keys (Parallel Key). Manufactured in any specification to your size. Click to see stock sizes.
  • Square End Round End DIN-6885-AB

    Square End Round End DIN-6885-AB
    CTS manufacturers DIN-6885-AB square/round end machine keys in S45C and SS304 or any metal to your specification. Click to see stock parallel key sizes; any custom size can be manufactured.

What are Parallel Machine Keys?

Parallel machine keys, also called shaft keys, are used in machinery to fasten wheels, pulleys, gears, and other parts to rotating shafts. They are called parallel keys because they are rectangular. The parallel key holds a part to a shaft by locking into a keyway channel on the part and a keyslot on the shaft, so the part and shaft must turn together.

Parallel machine keys are designed to break in the event that a machine jams, preventing the other expensive machine parts from damage. Machine keys are periodically replaced when performing repairs or maintenance. The width, height, and length of a replacement machine key must correspond to the dimenstions of the keyslot and keyway.

Parallel machine keys are made of different metals, usually steel or stainless steel.