| Also known as | 70-8137 |
| Listed in parts books | 1968, 1970–1971 |
NUT,5/16X26 CEI NYLOC - UK STAINLESS
A 5/16 inch, 26 TPI CEI-thread nyloc nut in stainless, also listed as 70-8137.
This is a 5/16 inch, 26 TPI nyloc nut, made to the old CEI cycle thread standard rather than modern UNF or UNC. The nylon insert in the nut gives it a locking action so it won't back off from vibration the way a plain nut can. It's made from stainless, so it holds up well against corrosion sitting out on a bike that lives outdoors or gets ridden in the wet.
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The CEI 26 TPI thread is a British cycle-industry standard that shows up all over these old Triumphs and other UK bikes of the era on smaller fasteners, so this nut can turn up in more than one spot on a given machine. It also carries the older 70-8137 part number if you're cross-checking against an earlier parts book.
We don't have detailed fitment records on this one beyond the thread and description, so if you're matching it to a specific bolt or stud, best to check the thread pitch against what you're pulling off before you order.
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