Tap, high carbon steel, 1/4-20 thread, taper tap. Track's 1/4-20 taps are used for top jaw screws.
The correct tap drill for this size tap is our Drill-7, 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.
Blind Hole: A blind hole refers to a hole that is drilled to a specified depth, without breaking through to the other side of the work piece.
Bottoming Tap: A type of hand tap that has 1 to 1 1/2 tapered threads and is used to tap to the very bottom of the hole. The bottoming tap is the last tap used in the sequence for blind holes.
Clearance Drill Size: The size of the drill required for a given threaded hole. The hole is drilled to this size before it is tapped.
Plug Tap: A type of hand tap that has 3 to 5 tapered threads and is often used second in the sequence of hand taps used to tap blind holes. Plug taps can be used in place of taper taps.
Straight Handle Tap Wrench: A type of tap wrench often used to hold taps with larger diameters. A straight-handle tap wrench gives more leverage and is easier to turn.
T-Handle Tap Wrench: A type of tap wrench often used to hold taps with smaller diameters. A T-handle tap wrench is turned with the palm of the hand and often requires more pressure.
Tap Wrench: A type of wrench that holds the square end of a tap in order to turn it. Tap wrenches are also used with hand reamers.
Taper Tap: A type of hand tap that has 8 to 10 tapered threads and is often used to tap through holes. A taper tap is the first tap used in a tapping sequence when tapping blind holes.
Through Hole: A hole that begins on one side of a work piece and extends through and exits another surface of the work piece.
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page_397.pdf
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drill bit, HSS, Number 7, .2010" diameter, tap drill 1/4-20 thread
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drill bit, HSS, Letter F, .2570" diameter, tap drill 5/16-18 thread
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Tap, 10-32 thread, high carbon steel, bottom tap, to finish a blind holeTap, high carbon steel, 1/4-20 thread, bottom tap
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Tap, high carbon steel, 1/4-20 thread, plug tap
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Tap handle, accepts 1/4" to 1/2" diameter taps
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