Chain Puller No 1. Suits 25 to 60 ASA & BS Pitch Chains

A chain breaker — also sold as a chain puller — is a hand tool that presses a roller chain's connecting pin out to disconnect the chain at any link, or presses a pin back in to rejoin it, without needing a connecting (master) link at that point. It's the standard way of shortening roller chain to the exact number of pitches a drive calls for, and of breaking a worn chain out during replacement.

What AIMS Stocks

This chain puller is available in two sizes, covering both the ASA and BS pitch numbering systems used on Australian industrial and agricultural chain:

• No.1 — ASA 25 to 60 (BS 06B to 12B) — light-to-medium chain, common conveyor and agricultural drive sizes
• No.2 — ASA 60 to 100 (BS 12B to 20B) — medium-to-heavy industrial chain

Select the size above that matches your chain's pitch. For chain outside this range, including larger industrial or mining-grade sizes, contact the AIMS team.

Using This Tool

Check how your chain is riveted before starting: centre-sink riveted chain can go straight onto the tool with no preparation, while double or quad-stake riveted chain needs the rivet heads ground back with an angle grinder first. The tool must be firmly secured — bench-mounted or clamped over solid support — before applying pressure, and safety glasses should be worn.

For the full how-to, including common mistakes and rejoining with a connecting link, see our Chain Breaker Guide.