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Hex Coupling Nuts - Rod Coupling Nuts - Threaded Rod Coupler - Coupling Nuts - 1/4-20 x 7/8-3/8 - (3/8" AF) | 18-8 Stainless Steel (Quantity: 150): Amazon.com: Industrial & Scientific
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1"-8 x W1 3/8" x L2 3/4" Coarse Thread A563 Grade A Hex Rod Coupling Nut Low Carbon Steel Hot Dip Galvanized | ASMC.net
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Hillman 5/8-in x 11 Zinc-plated Steel Regular Coupling Nut in the Coupling Nuts department at Lowes.com
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Value Collection - 3/8-16 UNC, 1-1/8″ OAL Stainless Steel Standard Coupling Nut - 70931670 - MSC Industrial Supply
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1/2-13 x 3/8-16 Coarse Thread Hex Rod Coupling Nut (Reducer) Low Carbon Steel Zinc Plated Pk 10: Amazon.com: Industrial & Scientific
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