Heavy Duty Needle and Thread Chart For Sewing Machines
The following chart compares various bonded nylon or polyester sewing thread specifications and the minimum needle sizes required
The V size is the common US measurement for twisted, multi-ply bonded nylon or polyester threads. Larger numbers indicate heavier threads.
The T sizes represent the "Tex" measurement system, where the number equals the weight in grams of 1000 meters of thread. If 1,000 meters weighs 70 grams, it is a Tex 70 thread. Larger numbers indicate heavier threads.
Please note that the "Tkt" (Ticket) sizes are equivalent to Metric "M" thread sizes used in some countries. Smaller numbers indicate heavier threads.