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M3-0.5 Flange Nylon Insert Lock Nuts Flanged Locknuts, DIN 6926, Stainless Steel 18-8 (304), Bright Finish, 25 PCS: Amazon.com: Industrial & Scientific
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Flex-Loc - Hex Lock Nut: Expanding Flex Top, 1/2-13, Grade 2 Steel, Cadmium-Plated - 67543447 - MSC Industrial Supply
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