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What is a Slotted Hex Nut? - Earnest Machine Products
1) 1-14 Slotted Hex Castle Nut Zinc Plated 1" x 14 Fine Thread 1 inch fine - Durable and Sturdy, Good Holding Power in Different Materials: Amazon.com: Industrial & Scientific
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Mac's Antique Auto Parts Model A Ford Emergency Handle Clamp - Special Drilled Bolt & Castle Nut | Ford | 1928-1929
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RELIABLE Castle Nut for Slipper Spring Equalizer Bolt #N-103