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Roller Chain Standards & Technical Specifications
Time : 2026-03-06
- Roller Chain Standardization Roller chain specifications are clearly defined in GB/T 1243 (Chinese national standard) and widely applied international standards. Chain numbers follow imperial units globally. Pitch calculation: Chain number × 25.4 ÷ 16 = pitch value (mm). Series A: American standard, high load, high precision, and widely used worldwide. Series B: British (European) standard, compact structure, suitable for light to medium loads. Standard chains are strongly recommended for design and maintenance to ensure interchangeability.
- Key Parameters of Roller Chains Pitch (P) Center distance between two adjacent pin centers; the most basic dimension for chain selection. Roller Diameter (d₁) Directly affects meshing with sprockets, load capacity, and service life. Inner Width (b₁) Inner distance between inner link plates determines matching with sprocket teeth. Pin Diameter (d₂) Core shearing and tension component, directly related to tensile strength. Chain Channel Height (h) Minimum passage height required for installed chain operation. Pitch Between Rows Fixed distance for multi‑row chains (double, triple, etc.).
- Structure & Connection Types Connecting Link Spring clip type: for pitch below 19.05 mm Cotter pin type: for pitch above 25.4 mm Press‑fit / riveted type: for high‑power and heavy‑load conditions Offset Link Used for odd‑number link lengths; not recommended for heavy loads or high speeds. Multi‑Row Chains Single, double, triple, and more rows; higher load capacity with more rows.
- Common Standard Chain Sizes The following are frequently used ISO & ANSI standard models: 08A: Pitch 12.7 mm (most common) 10A: Pitch 15.875 mm 12A: Pitch 19.05 mm 16A: Pitch 25.4 mm 20A: Pitch 31.75 mm 24A: Pitch 38.1 mm 32A: Pitch 50.8 mm 40A: Pitch 63.5 mm 48A: Pitch 76.2 mm Series B models include 06B, 08B, 10B, 12B, 16B, 20B, 24B, 32B, 40B, 48B, etc.
- Installation & Matching Notes Prefer an even number of links to avoid offset links. Confirm inner width, roller diameter, and pitch to match sprockets. Use correct locking parts (clips, cotter pins) to prevent the chain from loosening. For multi‑row chains, ensure parallelism and alignment. 6. Application Suggestions Select the A‑series for heavy‑duty transmission, conveyor lines, and construction machinery. Select B‑series for compact equipment, light machinery, and European‑standard devices. Use multi‑row chains for high‑power and heavy‑load conditions. Choose stainless steel, high-temperature, or self-lubricating chains for harsh environments.
