Replace worn or incorrect hardware with this Triumph 5/16‑inch‑26 x 5/8‑inch CEI bolt, part number 97‑0590, manufactured to original British Cycle Engineers Institute thread specification. The 5/16‑26 TPI CEI thread form is standard across many pre‑1968 British motorcycles, making this bolt a direct fit for a wide range of Triumph twins and singles as well as other classic British brands where this size is specified.
This bolt is ideal for engine, crankcase, and chassis applications that call for a short 5/8‑inch CEI fastener, and it can be used wherever Triumph lists PN 97‑0590 in the factory parts book. Correct thread pitch and shank length help maintain proper clamping force, reduce the risk of thread damage in aluminum castings, and preserve original alignment during assembly.
For best results, always chase existing threads, use appropriate flat or spring washers where specified, and tighten fasteners evenly in stages to the recommended torque for your model. Consult your Triumph parts book or workshop manual to confirm all locations that specify PN 97‑0590 and to verify the correct quantity required per application.
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.
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