Introduction to Roller Chain Attachments

Roller chain attachments are used in many applications to achieve various functions, MCC attachment chains including plates and pin attachment types. In this article, we will explain the meaning of different attachments.

Roller chain with attachment

The Attachment Structure

The attachment chain could be divided into two types: plate attachment chain and pin attachment chain. MCC can supply both types of attachment chains.

Plate attachment chain

The plate attachment chain is meant that the plates have a special structure. According to the needs, the plates could be provided with holes, threads, right-angle bends, welding……etc…

Pin attachment chain

The pin attachment chain could be provided with long pins, threads, special pin diameters…etc… Codes D, DD and D5 indicates different pin structures.

Attachment Chain Structure Description

What are A/K/SA/SK means?

Attachment bent or straight? On both side or one side? Below is the meaning of each attachment code:

  • A: A refers to 90 degree-bent plates on the one side of the chain.
  • K: K refers to 90 degree-bent plates on the both sides of the chain.
  • SA: SA refers to the straight attachments on the one side of the chain.
  • SK: SK refers to the straight attachments on the both sides of the chain.

attachment a1 k1 sa1 sk1

What are WA/WK/WSA/WSK means?

The rule for wide contours is the same as for attachments except that “W” is referred as the wide attachments, therefore, it’s easy to recognize the attachment starts with W. Also, the wide contour attachment is as equal wide as link plates.

  • WA: WA refers to 90-degree wide bent plates on the one side of the chain.
  • WK: WK refers to 90-degree wide bent plates on the both sides of the chain.
  • WSA: WSA refers to the wide straight attachments on the one side of the chain.
  • WSK: WSK refers to the wide straight attachments on the both sides of the chain.

attachment wide

The attachments have a one or two bolt holes that allow the components to fit precisely, referred to as A1, A2, K1, or K2.

D1, D3, DD1 and DD3 Pin Attachment

D1 and D3 are the pins extended, DD1 and DD3 refer to the extended pin on both sides.

  • D1 is referred to one extended pin on a pin link.
  • DD1 is referred to one extended pin on both pin link sides.
  • D3 is referred to two extended pins on a pin link.
  • DD3 is referred to two extended pin on both pin link side.

Extended pin attachment D1/D3/DD1/DD3

Double Pitch Roller Chain Attachments

Plate attachment chain

MCC double pitch roller chain also includes the A/K/SA/SK types that allow our customers to have various choices and combinations. With the combination of different double pitch applications, the attachment chain also has standard rollers, oversized rollers, oversized plastic rollers to choose from.

As the double pitch roller chain attachments are already designed as wider plates, there’s no wide (W type) attachments for double pitch roller chain attachments.

For name of double pitch attachments:

  • A: A refers to 90 degree-bent plates on the one side of the chain.
  • K: K refers to 90 degree-bent plates on the both sides of the chain.
  • SA: SA refers to the straight attachments on the one side of the chain.
  • SK: SK refers to the straight attachments on the both sides of the chain.

attachment double pitch

Extended pin, D5 and GK1 Attachment

As to the single pitch chain, the double pitch attachment roller chain could also offer D1, D3, DD1, and DD3 types. The difference between single pitch and double pitch attachment chain is that D5 and GK1 are only available on double pitch chain.

  • D1,D3,DD1,DD3 extended pin attachment.
  • D5 is an extended pin installed in the center of a link.
  • D5 pin attachment
  • GK1 attachment has a hole on plates, it’s also only available in double pitch roller chain, from size C2040 to C2080H.
  • GK1 attachment


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