Upgrade or restore your classic Triumph motorcycle with this authentic Triumph 5/16″-22 x 2 1/2″ BSF Crankcase Bolt (PN# 70-4541). Engineered to match original factory specifications, this bolt is a must-have for enthusiasts and restorers seeking reliability and authenticity.
Key Features
- Exact Fit: Designed for Triumph 650 unit twins produced from 1963 to 1968, including Bonneville, T120R, Tiger, TR6R, and TR6C models.
- Premium Quality: Manufactured in England from durable materials to ensure long-lasting performance and corrosion resistance.
- Precision Threads: Features a 5/16″ diameter with 22 threads per inch, utilizing the British Standard Fine (BSF) thread pattern common to vintage British motorcycles.
- Critical Application: Specifically intended for securing the crankcase halves at the top/front position, maintaining engine integrity and proper assembly.
- Authentic Restoration: Perfect for classic motorcycle restorations, this bolt preserves the original look, feel, and mechanical reliability of your Triumph.
Specifications
- Part Number 70-4541 (E4541)
- Diameter 5/16 inch
- Thread 22 TPI, British Standard Fine (BSF)
- Length 2 1/2 inches (63 mm)
- Application Crankcase top/front bolt
- Compatibility Triumph 650 unit twins (1963–1968)
Why Choose This Bolt?
- Ensures a secure and precise fit for your engine assembly.
- Maintains the authenticity and safety of your classic Triumph.
- Trusted by restorers and mechanics for accurate restoration projects.
