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Center Drills

Quick links: Plain Bell Metric

Plain Type

Plain Center Drill

Size Drill Diameter D1 Body Diameter D2 Drill Length L1 Overall Length L2
inch mm inch mm inch mm inch mm
00 0.025 0.64 1/8 3.18 0.030 0.76 1-7/32 30.95
0 1/32 0.79 1/8 3.18 3/64 0.97 1-7/32 30.95
1 3/64 1.19 1/8 3.18 3/64 1.19 1-1/4 31.75
2 5/64 1.98 3/16 4.76 5/64 1.98 1-7/8 47.62
3 7/64 2.78 1/4 6.35 7/64 2.78 2 50.80
4 1/8 3.18 5/16 7.94 1/8 3.18 2-1/8 53.97
5 3/16 4.76 7/16 11.11 3/16 4.76 2-3/4 69.85
6 7/32 5.56 1/2 12.70 7/32 5.56 3 76.20
7 1/4 6.35 5/8 15.88 1/4 6.35 3-1/4 82.55
8 5/16 7.94 3/4 19.05 5/16 7.94 3-1/2 88.90
9 11/32 8.73 7/8 22.22 11/32 8.73 3-5/8 92.07
10 3/8 9.52 1 25.40 3/8 9.52 3-3/4 95.25

Bell Type

Bell Center Drill

Size Drill Diameter D1 Body Diameter D2 Bell Diameter D3 Drill Length L1 Overall Length L2
inch mm inch mm inch mm inch mm inch mm
11 3/64 1.19 1/8 3.18 0.100 2.54 3/64 1.19 1-1/4 30.95
12 1/16 1.59 3/16 4.76 0.150 3.81 1/16 1.59 1-7/8 47.62
13 3/32 2.38 1/4 6.35 0.200 5.08 3/32 2.38 2 50.80
14 7/64 2.78 5/16 7.94 0.250 6.35 7/64 2.78 2-1/8 53.97
15 5/32 3.97 7/16 11.11 0.350 8.89 5/32 3.97 2-3/4 69.85
16 3/16 4.76 1/2 12.70 0.400 1.02 3/16 4.76 3 76.20
17 7/32 5.56 5/8 15.88 0.500 1.27 7/32 5.56 3-1/4 82.55
18 1/4 6.35 3/4 19.05 0.600 1.52 1/4 6.35 3-1/2 88.90

Metric

Metric Center Drill

Size Drill Diameter
D1 		Body Diameter
D2 		Drill Length
L1 		Overall Length
L2
mm mm mm mm
1.6mm 1.60 4.00 4.25 35.5
2mm 2.00 5.00 5.30 40.0
2.5mm 2.50 6.30 6.70 45.0
3.15mm 3.15 8.00 8.50 50.0
4mm 4.00 10.00 10.60 56.0
5mm 5.00 12.50 13.20 63.0
6.3mm 6.30 16.00 17.00 71.0
8mm 8.00 20.00 21.20 80.0
10mm 10.00 25.00 26.50 100.0

 

 
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