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South Coast Fasteners stocks the 5/16-9 x 4" Hex Head Lag Screws, Coarse, Low Carbon Steel, Zinc Cr+3 for fast 3-5 day shipping. Commonly called lag bolts. It measures 5/16" diameter, 4" length, coarse thread, Low Carbon Steel with a Zinc Cr+3 finish. Used in fastening thin metal without a pilot hole, it is part of our Stainless Steel Self-Drilling Screws line, stocked across industries such as Electrical, HVAC, and Construction.
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