Nut, 5/16in x 26tpi, extra height, reduced hex, Norton

Nut, 5/16in x 26TPI, extra height (9/32 inch), smaller OD /AF approx 7/16 AF (11mm) zinc plated. BSCY / CEI (cycle thread), chamfered one side only. Norton Dominator crankcase stud nut
Norton part number
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GT177