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Tapping Metric Coarse Data

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Heli-Coil taps in various types and styles produce holes for Tolerance Classes 4H5H or 3B and 5H or 2B for use in the general range of aluminums, magnesiums, mild steels, free machining stainless steels and other free machining materials. Conventional shop practice and production procedures, speeds, feeds and lubricants should be used in combination with proper fixturing and good tapping machines or tapping heads. The tapped hole must be held within the stated pitch diameter limits for the required Tolerance Class of fit for the installed Heli-Coil insert. For Standard (free running inserts), a tolerance class 5H or 2B is recommended. For Screw-Locking inserts, a tolerance class 4H5H or 3B is recommended in order to develop higher locking torques




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  Results 1 - 23 of 23 1 

Item #

Nominal Thread Size

Minimum Countersink "M" Diameter (120º ± 5º included angle)

Maximum Countersink "M" Diameter (120º ± 5º included angle)

Minimum Pitch Diameter

4H Maximum Pitch Diameter

5H Maximum Pitch Diameter

M2x0.42.30 M2X0.4 2.30 in 2.70 in 2.260 in 2.295 in 2.310 in
M2.2x0.452.40 M2.2x0.45 2.40 in 2.90 in 2.492 in 2.532 in 2.547 in
M2.5x0.452.90 M2.5x0.45 2.90 in 3.40 in 2.792 in 2.832 in 2.847 in
M3x0.53.40 M3x0.5 3.40 in 4.00 in 3.325 in 3.367 in 3.384 in
M3.5x0.64.10 M3.5x0.6 4.10 in 4.70 in 3.890 in 3.940 in 3.959 in
M4x0.74.70 M4x0.7 4.70 in 5.30 in 4.455 in 4.509 in 4.529 in
M5x0.85.80 M5x0.8 5.80 in 6.40 in 5.520 in 5.577 in 5.597 in
M6x17.10 M6x1 7.10 in 7.70 in 6.650 in 6.719 in 6.742 in
M7x18.10 M7x1 8.10 in 8.70 in 7.650 in 7.719 in 7.42 in
M8x1.259.50 M8x1.25 9.50 in 10.10 in 8.812 in 8.886 in 8.911 in
M10x1.511.80 M10x1.5 11.80 in 12.40 in 10.974 in 11.061 in 11.089 in
M12x1.7514.20 M12x1.75 14.20 in 14.80 in 13.137 in 13.236 in 13.271 in
M14x216.50 M14x2 16.50 in 17.10 in 15.299 in 15.406 in 15.444 in
M16x218.50 M16x2 18.50 in 19.10 in 17.299 in 17.406 in 17.444 in
M18x2.521.20 M18x2.5 21.20 in 21.80 in 19.624 in 19.738 in 19.778 in
M20x2.523.20 M20x2.5 23.20 in 23.80 in 21.624 in 21.738 in 21.778 in
M22x2.525.20 M22x2.5 25.20 in 25.50 in 23.624 in 23.738 in 23.778 in
M24x327.90 M24X3 27.90 in 28.50 in 25.948 in 26.093 in 26.135 in
M27x330.90 M27X3 30.90 in 31.50 in 28.948 in 29.093 in 29.135 in
M30x3.534.60 M30X3.5 34.60 in 35.20 in 32.273 in 32.428 in 32.472 in
M33x3.537.60 M33x3.5 37.60 in 38.20 in 35.273 in 35.428 in 32.472 in
M36x441.30 M36X4 41.30 in 41.90 in 38.598 in 38.763 in 38.809 in
M39x444.30 M39X4 44.30 in 44.90 in 41.598 in 41.763 in 41.809 in
  Results 1 - 23 of 23 1