KDK-150 Style T-Nut Blank and Screw Bolt ~ Blank Dimensions are 1 X 3 X 4-1/2 ~ Bolt thread is 5/8-18 X 60mm ~ T-nut blank can be machined to fit. ~ All working parts hardened and ground. KDK-150 Style T-Nut Blank and Screw Bolt ~ ~ ~ ~ Blank Dimensions are 1 X 3 X 4-1/2 Bolt thread is 5/8-18 X 60mm T-nut blank can be machined to fit. All working parts hardened and ground.