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Military Standard MS21042L06 Steel Dry Film Coated Nut, Self-Locking, Extended Washer, Hexagon at SkyGeek.com
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Steel Hex Flange Nut, Cadmium Plated Finish, Self-Locking Distorted Threads, Mil. Spec. MS21042-04, 4-40 Threads, 5/32" Width Across Flats, 1/8" Overall Height (Pack of 5) : Amazon.sg: DIY & Tools
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Mil-Spec Self-Locking Nut, MS21042, 6 Pt. Reduced Hex, Reduced Height, – Eversen Performance Products
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