Fowler Acme Inch Thread Gage

• This gage is a standard for grinding & setting tools when cutting Acme threads.• 29 degree pitch. Range of pitch: 1-10 (1, 1-1/2, 2, 3, 4, 5, 6, 7, 8, 9, 10)• Acme threads have the same depth as square threads, but the sides of the thread are at an inclination of 14-1⁄2 degrees (29 degrees included angle or 30 degrees for metric).• Angles & edges hardened and ground.