Cleveland C54447 Straight Flute Hand Tap 1/4"-20

Cleveland C54447 1/4"-20 Hand Tap Kit

The Cleveland C54447 is a three-piece straight flute hand tap kit designed for cutting internal threads. It targets the UNC standard with a 1/4"-20 thread size using high-speed steel construction. The bright uncoated finish suits general-purpose threading tasks in maintenance or light production. Machinists and technicians use these taps for through-hole or blind-hole applications.

Suited for right-hand UNC threads in steel

This kit suits users cutting 1/4"-20 UNC threads with a class 3B fit and H1 limit. The 75 percent thread depth requires a number 7 drill size for proper preparation. Builders needing left-hand threads or a different thread standard should look at other tooling. Applications requiring coated taps for abrasive materials or high-volume CNC runs are not addressed by this uncoated hand set.

1/4"-20 UNC thread size with H1 limit

The decisive specification is the 1/4"-20 UNC thread size combined with an H1 thread limit for a class 3B fit. This defines the exact pitch diameter tolerance the tap will cut. Verifying the required thread standard and limit against the engineering drawing confirms the part matches the job. The four-flute design and 1-inch thread length follow from this specification.