Square Head Set Screws (Jack Bolts) - Cup Pt., Dog Pt. - Brown Bolt
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T-H Marine Jack Plate Bolt Kit- Coarse Thread in the RV Accessories department at Lowes.com
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Jack Screws, Male-Female, Steel, Nickel Plating, 4-40 inch Screw Size, 3/16 inch OD, 3/16 Body Length, (Pack of 1000) Male Thread Length: 1/4 Inch: Amazon.com: Industrial & Scientific
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Back Off Jack Bolts for Improved Alignment Results - Acoem USA