Counterbored (Counter-Bored) Holes

CounterboredHolesChart.pdf

COUNTERBORED (COUNTER-BORE) HOLES
USA SOCKET-HEAD CAP SCREWS
SCREW  DIAA
COUNTERBORE DIA
B
COUNTERBORE DEPTH
C
COUNTERSINK DIA
D
CLEARANCE DIA
Normal FitClose Fit
#01/8.060.074#49#51
#23/16.086.102#363/32
#47/32.112.130#291/8
#51/4.125.145#239/64
#69/32.138.158#18#23
#85/16.164.188#10#15
#103/8.190.218#2#5
1/47/16.250.2789/3217/64
5/1617/32.312.34611/3221/64
3/85/8.375.41513/3225/64
7/1623/32.438.48315/3229/64
1/213/16.500.55217/3233/64
5/81.625.68921/3241/64
3/41-3/16.750.82825/3249/64
7/81-3/8.875.96329/3257/64
11-5/81.0001.1001-1/321-1/64
1-1/421.2501.3701-5/161-9/32
1-1/22-3/81.5001.6401-9/161-17/32
1-3/42-3/41.7501.9101-13/161-25/32
23-1/82.0002.1802-1/162-1/32
COUNTERBORED (COUNTER-BORE) HOLES
METRIC SOCKET-HEAD CAP SCREWS
M1.63.50mm1.6mm2.0mm1.95mm1.80mm
M24.40mm2mm2.6mm2.40mm2.20mm
M2.55.40mm2.5mm3.1mm3.00mm2.70mm
M36.50mm3mm3.6mm3.70mm3.40mm
M48.25mm4mm4.7mm4.80mm4.40mm
M59.75mm5mm5.7mm5.80mm5.40mm
M611.20mm6mm6.8mm6.80mm6.40mm
M814.50mm8mm9.2mm8.80mm8.40mm
M1017.50mm10mm11.2mm10.80mm10.50mm
M1219.50mm12mm14.2mm13.00mm12.50mm
M1422.50mm14mm16.2mm15.00mm14.50mm
M1625.50mm16mm18.2mm17.00mm16.50mm
M2031.50mm20mm22.4mm21.00mm20.50mm
M2437.50mm24mm26.4mm25.00mm24.50mm
M3047.50mm30mm33.4mm31.50mm31.00mm
M3656.50mm36mm39.4mm37.50mm37.00mm
M4266.00mm42mm45.6mm44.00mm43.00mm
M4875.00mm48mm52.6mm50.00mm49.00mm

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