Westward Hand Tap Set HSS 5/16-18 H3 Limit PK3

Fractional tap set for 5/16-18 UNC threads

This Westward hand tap set cuts standard UNC threads in a 5/16 inch by 18 pitch size. The package contains three high-speed steel taps with a bright uncoated finish. Each tap measures 1 1/8 inches in thread length and 2 23/32 inches overall. The tools are designed for right-hand threading in general-purpose applications.

H3 thread limit controls fit class

The set is manufactured to an H3 thread limit, which determines the pitch diameter tolerance and the resulting class of fit. This limit is the single specification that decides whether the taps produce threads that meet the required gauge for a given job. Selecting the correct H limit ensures the internal threads assemble properly with mating fasteners.

Four-flute design manages chips in hand use

Each tap features four flutes that provide chip clearance during manual operation. The high-speed steel construction resists wear when cutting ferrous and non-ferrous materials at hand-tapping speeds. The bright finish offers no coating lubricity, so cutting fluid is recommended to reduce friction and heat. Proper technique keeps power draw low and prevents tap breakage.