Maintain the integrity of your classic Triumph engine with this 5/16″-24 x 3-3/4″ UNF Crankcase Bolt (Part Number 21-1823). Manufactured to original Triumph specifications, this high-quality bolt is essential for secure and precise crankcase assembly on a wide range of Triumph 650cc and 750cc twin models from 1971 to 1983.
Key Features
- Exact Fit: 5/16-inch diameter with 24 threads per inch (UNF), 3-3/4 inches in length for correct alignment and clamping force.
- Durable Construction: Made from robust steel for strength and reliability, ensuring long-lasting engine performance.
- OEM Replacement: Direct replacement for Triumph part numbers 21-1823 and S1823, suitable for many “oil in frame” Triumph twins.
- Easy Installation: Hex head design allows for straightforward installation and removal with standard tools.
- Authentic Restoration: Perfect for engine rebuilds and restorations, retaining the original look and function of your vintage motorcycle.
Typical Applications
- Used as a crankcase bolt on Triumph 650 and 750 twins, including TR6, T120, and T140 models produced from 1971–1983.
- Ensures proper joining of crankcase halves, critical for engine assembly and reliability.
Specifications
- Part Number 21-1823
- Diameter 5/16 inch
- Thread Type UNF (Unified National Fine)
- Threads Per Inch 24 TPI
- Length 3-3/4 inch (95 mm)
- Application Crankcase bolt (Triumph 650/750 twins, OIF)
Choose this genuine Triumph crankcase bolt for dependable engine assembly and a factory-correct restoration on your classic motorcycle.
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