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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Triumph 750 Bonneville Tiger Sidepanel Badge Spire Nut(s) 1978-82 PN# 21-7020 S7020
$6.45 – $10.96Price range: $6.45 through $10.96
Triumph Norton BSA 1/2 inch X 20 TPI Bar Turned Hex Nut(s) CEI PN# TBS-4040 DS48 99-3557 15-5753
$28.80 – $51.98Price range: $28.80 through $51.98
Triumph Shock Mount Cylinder Base Nut 3/8-inch CEI Nut(s) PN# PO172A 60-4261 99-0047
$5.95 – $8.89Price range: $5.95 through $8.89
Triumph Tiger Bonneville Trophy 500 650 5/16-inch X 26 TPI CEI Nut(s) PN# 21-0151 S1-51
$5.53 – $7.50Price range: $5.53 through $7.50
Triumph Norton BSA Fuel Petcock Union Nut(s) PN# 82-3337
$9.09 – $12.90Price range: $9.09 through $12.90
Triumph Exhaust Clamp Nut(s) 10-32 TPI PN# 21-7009
$5.47 – $8.04Price range: $5.47 through $8.04
Triumph Connecting Rod Big End Lester Star Nut(s) UNF PN# 60-3761
$6.33 – $10.49Price range: $6.33 through $10.49
Triumph BSA 650 750 Rear Wheel Adjuster Nut(s) 1971-79 1/4-28 PN# 14-0301
$5.21 – $6.76Price range: $5.21 through $6.76
Triumph Unit Spring Clutch Adjuster Nut(s) 1/4 inch X 26 TPI CEI PN# 57-2526 57-0427
$9.96 – $22.38Price range: $9.96 through $22.38
Triumph 500 650 Tiger Trophy Bonneville Sidepanel Captive Nut(s) 1968-74 PN# 83-0222 21-0653 F10222 S653
$6.63 – $8.56Price range: $6.63 through $8.56
Triumph 500 650 750 T-Type Slim Nut(s) for Inlet Manifolds PN# 14-1301
$6.32 – $16.42Price range: $6.32 through $16.42
Triumph 500 650 750 Rear Axle Nut(s) up to 1969 3/4 inch X 20 TPI Zinc-Plated/SS PN# 82-1747 F1747
$15.57 – $55.67Price range: $15.57 through $55.67
Triumph T140 TR7 Alternator Rotor Nut(s) 1973-82 PN# 21-2182
$9.99 – $14.52Price range: $9.99 through $14.52
Triumph 500 650 Primary and Gearbox Chrome Dome Nut Pair(s) CEI to 1968 PN# 97-1531
$18.42 – $30.71Price range: $18.42 through $30.71
Triumph 350 500 650 Tiger Bonneville Lower Fork Bush Nut(s) 1964-67 PN# 97-1058 H1058
$22.20 – $39.06Price range: $22.20 through $39.06
Triumph Unit 650 Bonneville Tiger Rear Engine Plate Shouldered Nut(s) PN# 82-7389
$12.85 – $20.26Price range: $12.85 through $20.26
Triumph Unit and Pre-Unit Rear Engine Plate Shouldered Nut(s) PN# 82-3771
$13.96 – $38.36Price range: $13.96 through $38.36
Triumph 650 750 Chrome CEI Rocker Spindle Nut(s) 3/8 inch X 26 TPI PN# 70-1435
$13.23 – $35.70Price range: $13.23 through $35.70
Triumph Bonneville Tiger 500 650 Pre-Unit and Unit Rear Axle Nut(s) PN# 37-3425
$8.34 – $12.18Price range: $8.34 through $12.18
Triumph 500 650 750 T120 T150 Timing Side Inner Rear Axle Nut(s) PN# 21-2013
$7.89 – $11.29Price range: $7.89 through $11.29
Triumph 500 650 Twin Leading Shoe TLS T.L.S. Axle Nut(s) 3/4 inch X 20TPI PN# 21-1995
$9.33 – $13.33Price range: $9.33 through $13.33
Triumph 650 750 Mainstand Nut(s) 7/16 inch X 20 TPI PN# 14-0404
$5.63 – $6.76Price range: $5.63 through $6.76
Triumph 500 650 Handlebar Mounting Nyloc Nut(s) 3/8 inch X 24 TPI PN# 14-1903
$5.84 – $8.51Price range: $5.84 through $8.51
Triumph T140 TR7 Sidepanel Nameplate Badge Captive Nut(s) 2BA PN# 60-4154
$6.08 – $9.36Price range: $6.08 through $9.36
Triumph 350 500 650 Fork Leg, Cylinder Base and Ear Pinch Nut(s) 3/8 inch X 26TPI CEI PN# 70-2412 E2412
$7.33 – $13.41Price range: $7.33 through $13.41
Triumph 500 650 750 Brake Drum to Rear Hub Locking Nut (1) ’66-69 PN# 37-1691 W1691
$10.60 – $50.83Price range: $10.60 through $50.83
Triumph 500 650 750 Twins and Triple Side Stand Pivot Bolt(s) and Lock Nut(s) from 1967 on PN# 82-7021 14-1303
$15.56 – $25.13Price range: $15.56 through $25.13
Triumph 350 500 650 Front Fender Spigot Nut(s) 5/16-inch X 26TPI CEI PN# NS362 99-3541
$8.15 – $11.81Price range: $8.15 through $11.81
Triumph BSA Norton 1/4″-28 TPI UNF Cleveloc Nut(s) PN# 14-1201
$6.18 – $9.74Price range: $6.18 through $9.74
Triumph Carb Manifold Small Hex Nut(s) 5/16″ X 26 CEI PN# 70-1310 E1310
$8.18 – $16.30Price range: $8.18 through $16.30
