Precise Thread Triangles - TT-60

• Thread Triangles quickly measure pitch diameter of all 60 degree threads from 4 to 80 pitch, standard and special
• Instantly classifies thread as 2, 2a, 3a
• No complicated formulas to figure! For any standard thread refer directly to chart. For special threads just add 2 numbers.
• Convenient Neo-Prene holders, fit any make micrometer spindle
• Thread Triangles nest well into the "V" of the thread instead of making just point contact
• Micrometer rests on two parallel flat surfaces for better feel