6010 - 5/16" T-NUT - ATTACHES CASTERS & CASTER BOARDS use S51618 bolt) - DIY Road Cases Store
POWERTEC QTN1108 Screw-On Tee Nut, 5/16” x 18 (8PK), Zinc Plated Carbon Steel for Indoor/Outdoor Use - Screw On Flange T Nuts for Non-Rotating Fastening in Your Woodworking Shop - Amazon.com
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POWERTEC QTN1109 Screw-On T Nuts, 3/8”-16 TPI – Pack of 8 - Amazon.com
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POWERTEC 5/16 in.-18 Screw-On Tee Nut (8-Pack) QTN1108 - The Home Depot