Twist Drill :

 
High Speed Steel Center Drills
 

High Speed Steel Center Drills
 
 
Pilot Diameter K12 Body
Diameter H9
Overall Length Pilot Length
Max Min Max Min
1.0 3.15 33.5 29.5 1.9 1.3
1.25 3.15 33.5 29.5 2.2 1.6
1.6 4.0 37.5 33.5 2.8 2.0
2.0 5.0 42 38 3.3 2.5
2.5 6.3 47 43 4.1 3.1
3.15 8.0 52 48 4.9 3.9
4.0 10.0 59 53 6.2 5.0
5.0 12.5 66 60 7.5 6.3
6.3 16.0 74 68 9.2 8.0
8.0 20.0 83 77 11.5 10.1
10.0 25.0 103 97 14.2 12.8


Dimension in mm.

Specifications conform to IS:6708-1977/ISO 866-1975

B.S. No.

B.S. No Body
Diameter
Pilot
Diameter
Pilot Length Overall Length
Max Min Size Tot
1 1/8 3/64 5/64 1/16 1.1/2 1/32
2 3/16 1/16 3/32 5/64 1.3/4 1/32
3 1/4 3/32 5/32 1/8 2 1/16
4 5/16 1/8 3/16 5/32 2.1/4 1/16
5 7/16 3/16 9/32 1/4 2.1/2 3/32
6 5/8 1/4 3/8 5/16 3 3/32

7

3/4 5/16 15/32 13/32 3.1/2 3/32

Dimension in inches.

Specifications conform to BS 328 Part 2-1950

Type -B

Body
Diameter K12
Pilot
Diameter H9
Pilot Length Overall Length
Max Min Size Tot
1.6 6.3 47 43 2.8 2.0
2 8 52 48 3.3 2.5
2.5 10 59 53 4.1 3.1
3.15 11.2 63 57 4.9 3.9
4 14 70 64 6.2 5.0
5 18 78 72 7.5 6.3
6.3 20 83 77 9.2 8.0
8 25 103 97 11.5 10.1
10 31.5 128 122 14.2 12.8


Dimension in mm

Specification Conform to IS : 1977 / ISo 2540 - 1973

Specification conform to IS:7823-1983/ISO 3292-1975

FL=flute length     OAL= overall length

 


 
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