Classic Triumph motorcycles typically use UNF (Unified National Fine) nuts and bolts, which are imperial-sized fasteners. CEI nuts can also be found on many Brit bikes. Here are some key points about nuts for British motorcycles:
Table of Contents
Types of Nuts for British Motorcycles
Nyloc Nuts
Nyloc nuts are commonly used on classic Triumphs, particularly for handlebar mounting clamps. These nuts feature a nylon insert at the top to prevent accidental loosening due to vibration1. They are ideal for:
- Parts that pivot and cannot be fully locked down
- Areas subject to vibration
However, Nyloc nuts are not recommended for use where temperatures exceed 250°F (121°C).
Standard Nuts
Grade 5 UNF nuts are typically used for general applications on classic Triumphs. These provide a good balance of strength and durability for most motorcycle components.
Sizing
Classic Triumph motorcycles use imperial-sized nuts, with common sizes including:
- 3/8-24 UNF (often used for handlebar mounting clamps)
- Various other UNF sizes depending on the specific application
Considerations
Kits
While complete nut and bolt kits for frame fixings are not common, engine case and mounting bolt kits are readily available.
Originality
For restoration projects, using the correct UNF nuts helps maintain authenticity.
Replacement
When replacing nuts, it’s crucial to use the appropriate grade and size specified for your specific Triumph model.
Corrosion
Over time, original nuts may corrode. Some owners choose to replace all nuts and bolts during a restoration for a cleaner appearance.
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