8020, 13040, 15 40 Series 5/16-18 Steel Self Aligning Roll in T-Nut with Ball Spring - T Slot Accessories for 80/20 Aluminum Extrusion - Hardware Nuts (25 Pack This 80/20 T nut measures 13., 5 mm x 7., 2 mm x 22 mm long with a 5/16-18 thread and comes with a ball spring. This t-nut works with 5/16-18 bolts (not included) to attach joining plates, corner brackets, hinges, and other t track accessories to 80/20 aluminum extrusion. The projection on the T-nut aligns it in the T-slot while the ball spring holds the fastener in place, even when the profile is in a vertical position. Types Of T-Nuts Roll-in Ball Spring Nut 24-Pack 5/16-18 Roll-In T-Nuts With Ball Spring For 15 & 40 Series Aluminum Extrusion (8mm Slot) 80/20 Compatible T-nut For Aluminum Extrusion Order today, ships today. 13040 - T-Nut 5/16-18 Thread from 80/20, LLC. Pricing and Availability on millions of electronic components from Digi-Key Electronics Perfect for any home improvement enthusiast or general DIY'er. The self-aligning roll-in T-nut with ball spring is a fastening option that loads either from the profile ends or side, which is helpful for applications where the ends are inaccessible. Axageid 20 Packs 10-32 Threaded Steel Roll in T-Nut with This t-nut can be used in a wide variety of applications including 3d printers, cnc machine, building industrial aluminum frame structures, CNC laser cutters, Robotics Projects and more.