Roller Chain Connecting Links — Reliable Simplex & Duplex Chain Repair for Bikes, Conveyors & Machinery When a roller chain snaps mid-project or wears out a master link, every minute of downtime counts. Whether you're a bicycle mechanic, a maintenance technician keeping conveyor lines running, or a DIY builder assembling a drive system, having the right roller chain connecting link on hand is the difference between a quick fix and a costly delay. These connecting links are engineered to match standard ANSI/ISO roller chain specifications, giving you a drop-in replacement that restores full chain function without special tools. Each connecting link consists of a side plate, two pins, and a spring clip or cotter pin closure (buckle style varies by type — full link or half link). Available in 304 stainless steel for corrosion-resistant applications and carbon steel for general-purpose heavy-duty use. Chain sizes range from #25 (04C-1) with a 1/4 inch (6.35 mm) pitch up to #140 (28B-2) with a 1-3/4 inch (44.45 mm) pitch, covering both simplex (single-strand) and duplex (double-strand) configurations. Typical use cases include bicycle chain repair and replacement, agricultural equipment drive chains, industrial conveyor and elevator chain maintenance, and go-kart or small engine power transmission systems. Long-tail applications include roller chain master link replacement for #40 chain, stainless steel connecting link for food-grade conveyor, and duplex roller chain buckle for industrial machinery. 🔗 Compatible with standard ANSI/ISO simplex and duplex roller chains — sizes #25 through #140. Verify your chain number and pitch before ordering. ✅ Key Features of These Roller Chain Connecting Links 📐 Wide Size Range — Covers #25 (6.35 mm pitch) through #140 (44.45 mm pitch), fitting the most common ANSI/ISO simplex and duplex roller chain standards used in bicycles, conveyors, and drive systems. ⚙️ Two Buckle Styles — Choose Full Link Buckle (spring clip closure) for standard chain repair or Half Link Buckle for fine-tuning chain length without removing a full link. 🛡️ 304 Stainless Steel Option — Offers strong resistance to rust, oxidation, and moisture, making it suitable for outdoor, marine-adjacent, or washdown environments where carbon steel would corrode. 🔩 Carbon Steel Option — Delivers solid tensile strength for general-purpose industrial and mechanical applications at a cost-effective price point, ideal for dry or lubricated indoor drive systems. 🔄 Simplex & Duplex Coverage — Single-strand (simplex) and double-strand (duplex) variants available across multiple chain numbers, so you can match the exact strand count of your existing chain. 🛠️ Tool-Free Installation — Spring clip buckle design allows quick field installation and removal without a chain breaker tool, minimizing downtime during maintenance or emergency repairs. 📐 Technical Specifications — Roller Chain Connecting Links Chain Standard ANSI / ISO Roller Chain Chain Numbers Available #25, #35, #40, #50, #60, #80, #100, #140 Pitch Range 1/4 inch (6.35 mm) — 1-3/4 inch (44.45 mm) Strand Types Simplex (single-strand), Duplex (double-strand) Buckle Styles Full Link Buckle, Half Link Buckle Material Options 304 Stainless Steel / Carbon Steel Closure Type Spring clip (snap-on buckle) Surface Finish See variant options Tensile Strength See variant options Package Quantity 1 connecting link per unit (sold individually) ❓ Frequently Asked Questions How do I know which chain number connecting link I need? Match the chain number stamped on your existing chain or listed in your equipment manual. The chain number (e.g., #40, #50) directly corresponds to the pitch and roller dimensions. For example, #40 chain has a 1/2 inch (12.7 mm) pitch. If you're unsure, measure the distance between the centers of three consecutive pins and divide by two — that gives you the pitch in inches. What is the difference between a Full Link Buckle and a Half Link Buckle? A Full Link Buckle (also called a master link) replaces one complete link in the chain and keeps the total chain length the same. A Half Link Buckle adds or removes half a pitch length, allowing you to fine-tune chain length when a full link would make the chain too long or too short. Half links are commonly used on single-speed bicycles and some conveyor applications where exact chain length is critical. Should I choose 304 Stainless Steel or Carbon Steel? Choose 304 Stainless Steel if your application involves moisture, humidity, outdoor exposure, or occasional washdown — such as bicycle chains used in wet conditions, food-adjacent conveyors, or marine equipment. Choose Carbon Steel if your application is indoors, well-lubricated, and primarily load-bearing — such as industrial drive chains, go-karts, or agricultural machinery in dry environments. Carbon steel typically offers a lower cost per link for high-volume maintenance. Are these connecting links compatible with both ANSI and ISO chain standards? Yes. The chain numbers listed (e.g., #25, #35, #40) follow ANSI standards, which are dimensionally equivalent to their ISO counterparts (04C, 06B, 08A/08B, etc.). The variant names include both designations — for example, "#40 (08B-1)" — so you can cross-reference your ISO chain number directly. Always verify the pitch and roller diameter match your existing chain before installing. Can I use these connecting links on a bicycle chain? Yes, for single-speed and multi-speed bicycles that use standard roller chain sizes. #25 chain is commonly used on small bikes and go-karts, while #35 and #40 are found on heavier-duty single-speed setups. Modern derailleur bicycle chains (e.g., 8/9/10/11-speed) use narrower, proprietary chains that require brand-specific master links — these connecting links are designed for standard roller chain, not narrow derailleur chain. How do I install a spring clip connecting link? Thread the two pins of the connecting link through the open ends of the chain. Slide the side plate over both pins. Then press the spring clip (buckle) onto the grooves at the end of the pins — the closed end of the clip should face the direction of chain travel so it doesn't catch and pop off during operation. No special tools are required, though needle-nose pliers can help seat the clip firmly. What does the "-1" or "-2" suffix mean in the chain type designation? The suffix indicates the number of strands: "-1" denotes simplex (single-strand) chain, and "-2" denotes duplex (double-strand) chain. For example, "08B-1" is a single-strand #40 chain connecting link, while "08B-2" is the duplex version for double-strand #40 chain. Make sure to match the suffix to your chain's strand count. 🛒 Select your chain number, pitch, and material above, then add to cart. { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "How do I know which chain number connecting link I need?", "acceptedAnswer": { "@type": "Answer", "text": "Match the chain number stamped on your existing chain or listed in your equipment manual. The chain number (e.g., #40, #50) directly corresponds to the pitch and roller dimensions. If unsure, measure the distance between the centers of three consecutive pins and divide by two to get the pitch in inches." } }, { "@type": "Question", "name": "What is the difference between a Full Link Buckle and a Half Link Buckle?", "acceptedAnswer": { "@type": "Answer", "text": "A Full Link Buckle replaces one complete link and keeps total chain length the same. A Half Link Buckle adds or removes half a pitch length, allowing fine-tuning of chain length. Half links are commonly used on single-speed bicycles and some conveyor applications." } }, { "@type": "Question", "name": "Should I choose 304 Stainless Steel or Carbon Steel?", "acceptedAnswer": { "@type": "Answer", "text": "Choose 304 Stainless Steel for moisture, humidity, outdoor, or washdown environments. Choose Carbon Steel for indoor, well-lubricated, load-bearing applications such as industrial drive chains or agricultural machinery in dry conditions." } }, { "@type": "Question", "name": "Are these connecting links compatible with both ANSI and ISO chain standards?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. The chain numbers follow ANSI standards, which are dimensionally equivalent to ISO counterparts. Variant names include both designations (e.g., #40 / 08B-1) for easy cross-reference. Always verify pitch and roller diameter match your existing chain." } }, { "@type": "Question", "name": "Can I use these connecting links on a bicycle chain?", "acceptedAnswer": { "@type": "Answer", "text": "Yes, for single-speed and standard roller chain bicycles. These are not compatible with narrow derailleur chains (8/9/10/11-speed) which require brand-specific master links." } }, { "@type": "Question", "name": "How do I install a spring clip connecting link?", "acceptedAnswer": { "@type": "Answer", "text": "Thread the two pins through the open chain ends, slide the side plate over both pins, then press the spring clip onto the pin grooves with the closed end facing the direction of chain travel. No special tools required." } }, { "@type": "Question", "name": "What does the -1 or -2 suffix mean in the chain type designation?", "acceptedAnswer": { "@type": "Answer", "text": "The suffix indicates strand count: -1 is simplex (single-strand), -2 is duplex (double-strand). Match the suffix to your chain's strand count when ordering." } } ] }
