COBALT DRILL BITS
FRACTIONAL SIZES BY
135° Split Point Heavy Duty Drills - Gold Oxide
COBALT STEEL
Decimal
Flute
Overall
Dia.
Equiv.
Length
Length
Part No.
1/16
.0625
7/8
1-7/8
5/64
.0781
1
2
3/32
.0938
1-1/4
2-1/4
7/64
.1094
1-1/2
2-5/8
1/8
.1250
1-5/8
2-3/4
29 Piece Set
1/16 to 1/2 by 64ths
9/64
.1406
1-3/4
2-7/8
part# CH-129CO
5/32
.1562
2
3-1/8
11/64
.1719
2-1/8
3-1/4
3/16
.1875
2-5/16
3-1/2
21 Piece Set
1/16 to 3/8 by 64ths
13/64
.2031
2-7/16
3-5/8
part# CH-121CO
7/32
.2188
2-1/2
3-3/4
15/64
.2344
2-5/8
3-7/8
1/4
.2500
2-3/4
4
15 Piece Set
1/16 to 1/2 by 32ths
17/64
.2656
2-7/8
4-1/8
part# CH-115CO
9/32
.2812
2-15/16
4-1/4
19/64
.2969
3-1/16
4-3/8
5/16
.3125
3-3/16
4-1/2
13 Piece Set
1/16 to 1/4 by 64ths
21/64
.3281
3-5/16
4-5/8
part# CH-113CO
11/32
.3438
3-7/16
4-3/4
23/64
.3594
3-1/2
4-7/8
3/8
.3750
3-5/8
5
25/64
.3906
3-3/4
5-1/8
COBALT BITS - TYPE J
13/32
.4062
3-7/8
5-1/4
FOR DRILLING TOUGH MATERIALS
» Stainless Steel
27/64
.4219
3-15/16
5-3/8
12
» Titanium
7/16
.4375
4-1/16
5-1/2
» Iron Base Alloys
29/64
.4531
4-3/16
5-5/8
» Cobalt or Nickel Alloys
15/32
.4688
4-5/16
5-3/4
31/64
.4844
4-3/8
5-7/8
135° SPLIT POINTS
1/2
.5000
4-1/2
6
» No Walk - Self Starting
» Non-Skidding
Order by the full pack or individually.
» Eliminates Center Punching
1/16 thru 9/32, 12 per pack;
» Surface Treated Hardened Steel
19/64 thru 1/2, 6 per pack.
12-9
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