Tap, high carbon steel, 1/4-28 thread, bottom tap. Track's 1/4-28 taps are our most popular nipple thread size and are also used for top jaw screws.
The correct tap drill for this size tap is our Drill-3, see below.
The correct clearance drill is our Drill-F, see below.
Not sure type of tap you need? Click on the "definitions" tab above.
Gunsmithing tip: We prefer high carbon steel taps for gunsmithing. Be careful of using HSS (high speed steel) taps when tapping blind holes. If a HSS tap breaks, it must be "burned" out using an EDM tap burner, a costly process! If broken, Track's high carbon steel taps can be fractured and picked out using a drift punch.
