Centre Drill

Making this the first true uses a dictionary of over combined with a handful to generate which looks reasonable.

Dedicated Impex Co.(DIC) has been family owned and in full operation for over many years as they proudly manufacture solid carbide cutting tools, CNC Solutions, Woodworking Tools, Gear Cutting Tools etc. for a vast variety of industries.

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Centre Drill

Centre Drill


IS 6708 - 1977

Pilot Drill Body Diameter Overall Length
1.6 4.0 37.5
2.0 5.0 42.0
2.5 6.3 47.0
3.15 8.0 52.0
4.0 10.0 59.0
5.0 12.5 66.0
6.3 16.0 74.0
8.0 20.0 83.0
10.0 25.0 103.0

BS 328 - Part :2 : 1950

B.S. No. Pilot Drill Body Diameter Overall Length
1 3/64 1/8 1.1/2
2 1/16 3/16 1.3/4
3 3/32 1/8 2
4 1/8 5/16 2.1/4
5 3/16 7/16 2.1/2
6 1/4 5/8 3
7 5/16 3/4 3.1/2

IS 6709 - 1977

Pilot Drill Body Diameter Bell Diameter Overall Length
1.6 6.3 3.35 47.0
2.0 8.0 4.25 52.0
2.5 10.0 5.30 59.0
3.15 11.2 6.80 63.0
4 14.0 8.50 70.0
5 18.0 10.60 78.0
6.3 20.0 13.20 83.0
8 25.0 17.0 103.0
10 31.5 21.20 126.0