Description 3/8"-16 Nylon Insert Lock Nut- USS-Coarse - For A15 harrow tooth U-bolt. Fits JD Finishing Harrow Models 400, 600, 610 and 810; Noble Do-All; Case/IH Harrow/Do-All Models 468 and 568 and Wil-Rich Seed-bed Finisher (Do-All). Order Multiples of 100. This item is a suitable alternative for the following: 120-8446, 5006345, 5006092, 38CLN, 37CNNE2Z, 37CNNE0Z, 2503816, 14H813, 120377