Thread Checker Nut and Bolt Gauge Set, 55 Pc is a compact thread identification kit designed to help you quickly match screw, bolt, and nut sizes in standard and metric threads. With 30 standard sizes and 25 metric sizes, it gives you a practical way to check fasteners without guessing or making extra trips to the hardware store.
Built from durable aluminum and organized in a foam-lined storage box, this set is made for easy access, clear reading, and dependable everyday use. It includes exclusive M11 metric sizes for automotive applications, plus multiple ways to identify each gauge so you can work faster in tight spaces and with greater confidence.
Standard sizes included: 2-56 UNC, 4-40 UNC, 6-32 UNC, 6-40 UNC, 8-32 UNC, 10-24 UNC, 10-32 UNF, 12-24 UNC, 1/4-20 UNC, 1/4-28 UNF, 5/16-18 UNC, 5/16-24 UNF, 3/8-16 UNC, 3/8-24 UNF, 7/16-14 UNC, 7/16-20 UNF, 7/16-24 UNF, 1/2-13 UNC, 1/2-20 UNF, 9/16-12 UNC, 9/16-18 UNF, 9/16-20 UNF, 5/8-11 UNC, 5/8-18 UNF,