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 classic Triumph motorcycles:
Types of Nuts
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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