PREMIUM QUALITY AMERICAN-MADE CUTTING TOOLS Technical Information
THREAD FORMING TAPS
PRE TAP HOLE SIZE
PRE TAP HOLE SIZE - METRIC
TAP SIZE
75% THREAD
65% THREAD
NEAREST DRILL SIZE
TAP SIZE
75% THREAD
65% THREAD
NEAREST DRILL SIZE
TPI
PITCH
0.057 0.061 0.072 0.091 0.110 0.128 0.145 0.183 0.218 0.291 0.365 0.439
80 64 72 56 64 48 56 40 48 40 44 32 40 32 36 24 32 24 28 20 28 18 24 16 24 14 20 13
0.054 0.066 0.067 0.078 0.079 0.090 0.091 0.100 0.103 0.113 0.114 0.124 0.126 0.149 0.151 0.170 0.175 0.196 0.199 0.225 0.233 0.285 0.292 0.344 0.355 0.402 0.414 0.462
0.055 0.067 0.068 0.079 0.080 0.091 0.092 0.101 0.104 0.114 0.115 0.125 0.127 0.150 0.152 0.172 0.176 0.198 0.201 0.227 0.235 0.287 0.294 0.347 0.357 0.405 0.416 0.466
#54 or 1.4mm #51 or 1.7mm #51 or 1.75mm #47 or 2.0mm
0.35 0.35 0.4 0.45 0.5 0.6 0.7 0.8 1 1.25 1.5 1.75
0.058 0.062 0.073 0.092 0.111 0.129 0.146 0.184 0.220 0.294 0.368 0.442
1.45 mm 1.55 mm 1.85 mm 2.30 mm #35 #30 3.70 mm #14 5.50 mm 7.40 mm 9.30 mm 7/16”
0 1 1 2 2 3 3 4 4 5 5 6 6 8 8
M1.6 M1.7 M2 M2.5 M3 M3.5
2.0 mm 2.3 mm 2.3 mm
M4 M5 M6 M8
#39 #37
#33 or 2.9mm #33 or 2.9mm 3.1 mm 1/8” or 3.2mm #25 or 3.8mm #24 11/64” #16 or .176” #9 or 5.0mm #7 or 5.1mm 5.75 mm A˝ 7.25 mm .293” S˝ or 11/32” 9.0 mm Y˝ Z˝ or 10.5mm .463”
M10 M12
WHERE TO USE THREAD FORMING TAPS Materials particularly well suited for thread forming include aluminum, brass, copper, lead, stainless steel, carbon steel, cast steel, leaded steel and zinc. In general, any material which produces a stringy chip is a good candidate for cold forming threads. If the chips are powdery, the material may be too brittle. Forming taps generate threads without producing chips. The threads produced are much stronger than those created by cut taps because of the displacements of the grain of the metal in the workpiece. Cutting taps produce chips which may interfere with the tapping process.
10 10 12 12
1/4 1/4
5/16 5/16
3/8 3/8
7/16 7/16 1/2
MAJOR ADVANTAGES TO THREAD FORMING
• Chipless Tapping – no chip removal problems in blind holes. • Stronger Threads – the grain flow of formed threads follows the contour of the thread in steel and stainless steel, resulting in greater thread strength. • Better Thread Gaging – forming taps create their own lead therefore the possibility of producing oversized threads is greatly reduced. • Stronger Taps – the absence for the need for flutes results in a stronger more solid tap. • Longer Tap Life – forming taps last 3 to 20 times longer because they have no cutting edge to dull. • More Efficient Production – longer tap life, less tap breakage and faster tapping speeds (up to 2X faster than cutting taps). • Ideal for Non-Lead Screw Tappers – the ability to form their own lead makes forming taps well suited for NC machines or other machines without lead screws.
MADE IN THE USA
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