Besly W5569 Bottom Tap 6 Flute 1-1/2-12 NF GH4

Besly W5569 Bottom Tap, 6-flute, 1-1/2-12 NF GH4, is a hand tapping tool designed to form internal threads in metal with a bottoming geometry. The 1-1/2-12 National Fine (NF) thread specification identifies a 1.5-inch diameter and 12 threads per inch, offering a finer pitch for precise, secure engagement in threaded assemblies. A six-flute configuration promotes efficient material removal and helps maintain stable cutting action as the tap progresses toward full thread depth. As a bottom tap, it is intended to cut threads along the full length of the threaded portion, suitable for through-holes and blind-hole machining when used with an appropriate pre-drilled hole. Besly, a U.S.-made tooling brand, positions this model within its standard tapping lineup for professional metalworking, construction, and shop applications that require reliable internal thread formation at the NF pitch. The GH4 designation aligns with common thread-limit classifications used for this size and style in industrial catalogs, signaling compatibility with standard 1-1/2-12 NF threading tasks in a range of ferrous and nonferrous metals.