- 5/8 In. x 18 National Fine Thread Fractional Tap
- high carbon steel for durability
- Ideal for routine maintenance, repair work, and for rethreading where high accuracy and tolerance thread is not critical
- Straight flutes are ground to provide rapid chip removal for efficient threading
- Designed for hand threading work in a variety of materials
- Produces a Class 2B thread
- A 37/64 In. drill bit is recommended for use with this tap