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Nut, hex, castle, plain, GR 8.8, UNC, 38.1 mm, 6 TPI, Fastbolt.
Brand: Fastbolt
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Castle nuts are used with bolts and studs that have a hole drilled in their threaded section through which a cotter pin is inserted to prevent the nut from rotating. The nut is quite effectively retained until the pin is removed or shears.

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Product properties
Brand Fastbolt
Category Castle
Outside Diameter (mm) 38.1
Grade 8.8
Material High Tensile
Series Imperial
Thread Type UNC
Type Castle
Surface Finish Plain
TPI 6.0