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When a worn or snapped drive chain brings your machinery to a halt, every minute of downtime costs you. Whether you're a maintenance technician, a workshop owner, or a hands-on maker running conveyor systems, finding the right roller chain in the right pitch and strand configuration shouldn't be a guessing game. This listing covers the most widely used ISO metric roller chain sizes — #60 (12A/12B) and #80 (16A/16B) — in both simplex (single-strand) and double-strand configurations, along with matching full buckle and half buckle connecting links.
Each roller chain is constructed from carbon steel with precision-hardened pins, bushings, and rollers. The #60 series features a 3/4" (19.05mm) pitch, while the #80 series runs a 1" (25.4mm) pitch. Chains are available in 1.5-meter lengths or as individual connecting links (full buckle or half buckle). Roller diameter and plate thickness conform to ISO 606 / ANSI B29.1 standards, with inner plate widths typically ranging from 9.5mm to 15.9mm depending on the series and strand count.
These roller chains are suited for a wide range of applications: agricultural equipment drive systems requiring a dependable #60 simplex chain replacement, industrial conveyor lines where a double-strand #80 roller chain handles elevated load demands, and light manufacturing machinery where a #60 or #80 connecting buckle link enables fast field repairs without breaking the full chain run.
Available in 3/4" (19.05mm) for #60 12A/12B and 1" (25.4mm) for #80 16A/16B — covering the most common metric and imperial-equivalent drive chain applications.
Choose single-strand (simplex) for standard drives or double-strand for higher torque and load-sharing conveyor applications without upsizing the sprocket.
Each connecting link variant — full buckle (spring clip) and half buckle (cotter pin) — is sold separately so you can stock the exact repair link your chain requires.
Hardened pins, bushings, and rollers resist wear under continuous cycling loads. Plates are stamped to ISO tolerances for consistent engagement with matched sprockets.
12A and 16A designations follow ISO 606; 12B and 16B follow the British Standard (BS) variant. Both are interchangeable with sprockets of the same pitch and strand count.
Order a 1.5-meter chain length for full replacements or a single connecting link for fast field repairs — no need to buy more than you need.
| Chain Standards | ISO 606 (12A/16A), BS (12B/16B), ANSI B29.1 equivalent |
|---|---|
| Available Pitches | 3/4" (19.05mm) — #60/12A/12B; 1" (25.4mm) — #80/16A/16B |
| Strand Configuration | Simplex (single-strand) / Double (duplex) |
| Connecting Link Types | Full Buckle (spring clip), Half Buckle (cotter pin) |
| Material | Carbon steel, hardened pins and bushings |
| Inner Plate Width | See variant options |
| Roller Diameter | See variant options |
| Breaking Load | See variant options |
| Chain Length Option | 1.5 meter per piece |
| Finish | See variant options |
Both 12A and 12B share the same 3/4" (19.05mm) pitch, but they follow different dimensional standards. 12A conforms to ISO 606 (similar to ANSI #60), while 12B follows the British Standard (BS) with slightly different inner plate width and pin diameter. Always match the chain designation to your sprocket's specification — a 12A chain will not seat correctly on a 12B sprocket and vice versa.
Simplex (single-strand) chains are suitable for standard power transmission drives where load requirements fall within the chain's rated capacity. Double-strand chains share the load across two rows of rollers, effectively doubling the working load limit without requiring a larger pitch. Choose double-strand when your drive torque exceeds the simplex rating or when you need added redundancy in a conveyor application.
A full buckle (also called a spring clip or snap link) uses a spring-steel clip to retain the outer plate — it is faster to install and remove, making it ideal for applications where the chain is frequently disconnected. A half buckle (cotter pin link) uses a split cotter pin for retention, providing a more secure lock that is less likely to vibrate loose under shock loads. For high-vibration or heavy-duty conveyor use, the half buckle is generally preferred.
These chains are manufactured to ISO 606 and BS dimensional standards. They will fit any sprocket designed for the same pitch and strand count — for example, a #60 / 12A simplex chain fits a 12A simplex sprocket with 3/4" pitch. Verify your sprocket's pitch, strand count, and standard (ISO/BS) before ordering to ensure correct engagement.
Measure the distance between the centers of two adjacent pins — this is the pitch. A pitch of approximately 19mm confirms a #60/12A/12B chain; approximately 25.4mm confirms a #80/16A/16B chain. Also count the number of strands (rows of rollers) to determine simplex or double configuration. If the chain is worn, measure across multiple links and divide for a more accurate average pitch.
Roller chains should be lubricated regularly with a chain-specific oil to reduce pin and bushing wear. Check tension periodically — excessive sag accelerates wear on both the chain and sprocket teeth. Inspect for elongation (chain stretch) by measuring a known number of links; replace the chain when elongation exceeds 1–2% of the nominal length. Always replace the sprocket when fitting a new chain if the sprocket teeth show visible wear.
Yes. A full buckle or half buckle connecting link of the matching chain series (e.g., 12A full buckle for a 12A simplex chain) can be used to join two chain lengths or to close a loop after fitting. Ensure the connecting link's pitch and strand count match the chain exactly. For permanent or high-load installations, a half buckle (cotter pin) link is recommended over a spring clip for added security.
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