To cut an internal thread, select the tap of the desired size, tap wrench, proper drill size or hole size, and lubricating or cutting oil. The proper hole size is very important in the formation of good threads. An oversized hole results in reduced thread height, an undersized hole will overload the tap and cause undue breakage. Refer to the required drill size permanently marked on the end of each tap and drill the hole to desired depth.
To cut an external thread, such as on a bolt, select the correct die for the rod being threaded, die stock, and lubricating or cutting oil. Size of the rod or bolt, is of great importance. It must be no larger than the desired thread, and preferably 005" to 010" undersized. Oversized work may damage the die and will make turning very difficult. Slightly undersized work is easier to thread and furnishes enough thread height for normal use. After securing the part being threaded, insert the die into the die stock and run the screw snugly into one of the recesses in the outside surface of the die. (The recess and slot pattern of dies allows use with a variety of die stocks.)
The chamfered side of the die is used for starting the threading operation. Always bevel the end of the piece to be threaded to make angles starting easier. This filed or ground chamfer also helps in starting at right to the work which is of great importance. Start the die on the rod with clockwise rotation until it begins cutting onto the work piece. Chips will flow into the holes provided and should be broken by reversing the action every 1/4 to 1/2 turn depending upon tightness encountered.
METRIC Tap and Die size: M3-0.5, M 4-0.7, M 5-0.8, M 6-1.0, M 7-1.0, M 8-1.0, M 8-1.25, M 9-1.25, M 10-1.5, M 10-1.25, M 11-1.5, M 11-1.25, M 12-1.75, M 12-1.5, M 14-2, M 14-1.5, M 16-2, M16-1.5 ；SAE Tap and Die size: 1/8"-27NPT, 4-40, 6-32, 8-32, 10-32, 10-24, 12-24, 1/4"-20, 1/4"-28, 5/16"-18, 5/16-24,3/8"-16,3/8"-24, 7/16"-14, 7/16"-20, 1/2"-13, 1/2"-20, 9/16"-12, 9/16"-18, 5/8"-11, 5/8"-18
The tap and Die are designed to thread cutting: tap is used to process internal thread, while the die is for external thread.
This is accomplished by reversing the tap direction every 1/4 to 1/2 revolution depending on the tightness encountered providing lubrication to the cutting edges while tapping will result in smoother threads and longer tap life
This kit comes with a full range of most popular metric taps & dies with both coarse and fine sizes, plus all needed wrenches, handles, a gauge and a storage case
Perfect to create new threads or repair damaged threads on most metals like carbon steel, cast iron, aluminum, brass, copper and stainless steel
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