Hole Machining Specifications

For Inch Thickness Sheetmetal

  • Friction Drilled/Tapped Holes
  • -> Not Applicable for Inch Thickness Sheetmetal
  • Countersunk Holes
  • Metric standard (ISO10642)
  • *Will be manufactured so that the head section does not protrude when using hex-socket countersunk bolts (JIS-B1194).
  • The screw will be threaded through to check that it is the correct size.

Metric standard (ISO10642) * Unit: Metric

No. Nominal Diameter M3 M4 M5 M6 M8 M10 M12 M14 M16 Example
1 Countersink Diameter (D) (Min) 5.54 7.53 9.43 11.34 15.24 19.22 23.12 26.52 29.01 Example
(Max) 6.72 8.96 11.20 13.44 17.92 22.40 26.88 30.80 33.60
2 Pilot Hole Diameter (d) (Min) 2.87 3.83 4.83 5.83 7.79 9.79 11.74 13.74 15.74
(Max) 3.30 4.40 5.50 6.60 8.54 10.62 13.50 15.50 17.50
3 Countersink Height (t) Reference Dimensions 1.86 2.48 3.10 3.72 4.96 6.20 7.44 8.40 8.80
Inch standard (ASME B 18.3)
  • *Will be manufactured so that the head section does not protrude when using hex-socket countersunk bolts (ASME B 18.3).
  • The screw will be threaded through to check that it is the correct size.
Inch standard (ASME B 18.3) * Unit: Inch
No. Nominal Diameter #0 #1 #2 #3 #4 #5 #6 #8 #10 #12 1/4 5/16 3/8 7/16 1/2 5/8 3/4 7/8 Example
1 Countersink Diameter (D) (Min) 0.117 0.143 0.168 0.193 0.218 0.24 0.263 0.311 0.359 0.41 0.48 0.6 0.72 0.781 0.872 1.112 1.355 1.604 Example
(Max) 0.138 0.168 0.197 0.226 0.255 0.281 0.307 0.359 0.411 0.45 0.531 0.656 0.781 0.844 0.938 1.118 1.438 1.688
2 Pilot Hole Diameter (d) (Min) 0.0568 0.0695 0.0822 0.0949 0.1075 0.1202 0.1329 0.1585 0.184 0.2102 0.2435 0.3053 0.3678 0.4294 0.4919 0.6163 0.7406 0.8647
(Max) 0.06 0.073 0.086 0.099 0.112 0.125 0.138 0.164 0.19 0.2158 0.25 0.3125 0.375 0.4375 0.5 0.625 0.75 0.875
3 Countersink Height (t) Reference Dimensions 0.045 0.055 0.064 0.073 0.082 0.09 0.097 0.112 0.127 0.135 0.162 0.198 0.234 0.234 0.252 0.284 0.396 0.468

For Metric Thickness Sheetmetal

Friction Drilled/Tapped Holes
No. Standard Part Standard Value Example
1 Flange thickness 1/2 of Sheet Thickness (reference value) Example
2 Flange height Equal to Sheet Thickness (reference value)
Countersunk Holes
No. Nominal Diameter M3 M4 M5 M6 M8 M10 M12 M14 M16 Example
1 Countersink Diameter (D) Standard Dimensions 6.3 8.3 10.4 12.5 16.5 20.0 24.5 28.5 32.5 Example
Maximum 6.9 9.6 11.1 13.3 17.8 22.4 26.5 30.5 34.5
2 Pilot Hole Diameter (d) Standard Dimensions 3.4 4.3 5.3 6.5 8.5 10.5 12.5 14.5 16.5
Maximum 4.7 7.0 8.4 9.9 13.8 14.2 14.5 16.5 18.5
3 Countersink Height (t) Reference Dimensions 1.5～1.6 2.0～2.3 2.5～2.7 2.2～2.9 3.2～3.8 4.9～5.1 6.0 7.0 8.0
*Will be manufactured so that the head section does not protrude when using hex-socket countersunk bolts (JIS-B1194).
Press-fit nut
No. Nominal diameter M3 M4 M5 M6 M8 M10 M12 Example
1 Width of two face 5.5 7.0 8.0 10.0 13.0 15.0 17.0
2 Hight of nut 2.1 2.3 3.1 4.1 4.6 6.1 7.1
  • *The values of press-fit nut are for reference only.
  • *The mounting angle (angle between one corner of the nut and the edge) of the nut (press-fit) is optional.
Weld (spot) nut
No. Nominal diameter M4 M5 M6 M8 M10 M12 Example
1 Width of two face 11.0 11.0 13.0 15.0 17.0 19.0
2 Hight of nut 4.2 4.2 5.2 6.7 8.2 9.8
  • *The values of weld (spot) nut are for reference only.
  • Nuts will be used equivalent to the values in the table above.
  • For weld (spot) nut, nuts with strength category 5 in accordance with JIS B1196:2010 are used.
  • *The mounting angle (angle between one corner of the nut and the edge) of the nut (spot weld) is optional.

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