Cleveland C55124 Straight Flute Hand Tap 3/8"-16 Plug HSS TiN

Cleveland C55124 Straight Flute Hand Tap

The Cleveland C55124 is a straight-flute hand tap designed for cutting internal UNC threads in through-holes or deep blind holes. Machinists and maintenance technicians use it to produce 3/8"-16 threads in steel, cast iron and non-ferrous metals. The TiN coating increases surface hardness and reduces friction for longer tool life. Right-hand cutting direction matches standard threading practice.

Plug chamfer limits starting torque

A plug chamfer provides a moderate lead that balances ease of starting with thread depth reach. It requires higher starting torque than a taper tap and clears chips less efficiently than a bottoming tap in blind holes. The 1.25 in thread length and 2.94 in overall length restrict use to holes that accommodate this reach. The 75 percent thread drill size of 5/16 in must be observed for proper thread formation.

H2 thread limit determines class-of-fit compliance

The H2 thread limit is the single specification that decides whether this tap produces the required 2B class of fit for the application. Selecting a different limit would yield a tighter or looser thread than specified. Verify the H2 designation against the engineering drawing before purchase.