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.
The product images shown are for illustrative purposes only and may not be an exact representation of the product received. Manufacturers occasionally make minor cosmetic changes to items, such as color, finish, label, or design. These changes do not impact the item’s function or compatibility. Please contact us if you have specific concerns regarding appearance.
