Sprockets

Sprockets: BS and ASA Pilot Bore, Taper Lock, Weld-Fit and Plate Wheel Sprockets

AIMS Industrial stocks sprockets across British Standard (BS) and American Standard (ASA/ANSI) pitch series, in pilot bore, taper lock, and weld-fit configurations for simplex, duplex & triplex roller chain drives. Whether you're replacing a worn sprocket or specifying a new chain drive system, we stock the correct tooth profile and bore configuration to suit your chain pitch and shaft diameter.

The AIMS Sprockets Range

All sprockets in our range are manufactured to BS and ASA dimensional standards and are compatible with KCM & SY roller chain available in our chain and sprockets collection.

• BS Pilot Bore Sprockets (Simplex, Duplex & Triplex): British Standard pilot bore sprockets in simplex (single strand), duplex (double strand) and triplex (triple strand) configurations. The pilot bore is machined undersized and must be bored and keyway-cut to the required shaft dimensions. Standard simplex sizes cover the most common BS chain pitches.
• ASA Pilot Bore Sprockets (Simplex, Duplex & Triplex): American Standard (ASA/ANSI) pilot bore sprockets for inch-series roller chain — required for equipment imported from the USA, Canada, or specified to ANSI chain standards.
• BS Taper Lock Sprockets: Taper lock BS sprockets accept standard taper lock bushes for quick-release shaft mounting and demounting. The preferred specification for maintenance-friendly drive design where sprocket replacement is anticipated during the machine's service life.
• Weld-Fit Sprockets: Weld-fit sprockets with hardened teeth are welded directly to the shaft. Used where the bore arrangement prevents taper lock or key fitting, particularly in conveyor and agricultural machinery.
• Plate Wheel Sprockets: BS simplex plate wheel sprockets provide a higher-tooth-count option in a flat plate format for large-diameter, low-speed drives where a hub-type sprocket would create unwanted inertia or clearance issues.

Sprocket Replacement Guidance

• Replace Chain and Sprockets Together: A worn sprocket will accelerate wear on a new chain, and new sprocket teeth will rapidly wear if matched to stretched chain. Always replace both simultaneously for maximum service life of the new drive components.
• Check Chain Pitch Before Ordering: BS chain pitch is the distance between pin centres. Confirm your chain pitch before selecting a replacement sprocket. BS & ASA both have the same pitch but other dimensions differ so check markings on existing chain & sprockets or measure in detail.

Expert Support: Need help identifying the correct sprocket specification for your drive? Contact our team or request a quote with your chain pitch, tooth count, and shaft diameter.

Australian Business, Local Supply: As a proudly Australian business since 1988, we stock locally and work with trusted local Australian manufacturers and distributors to ensure fast, reliable supply.

Complete your chain drive with roller chain and connecting links, bearings, and lubrication for chain maintenance.