Cylindrical shank compatible with three-jaw drill chucks.
LONG LIFETIME WHEN DRILLING STAINLESS STEEL
The Cobalt Drill Bit provides long-lasting performance when drilling stainless steel. This extended lifetime results from a cobalt alloy content of 5% and fully ground HSS (high-speed steel), which provides excellent surface quality, wear resistance and heat protection. Equipped with two cutters and two flutes, chips are removed quickly to make the bit last even longer. This drill bit works with alloyed and non-alloyed steel, stainless steel, cast iron, cast steel and acid- and heat-resistant steels.
Bosch cobalt drill bits are specially designed for drilling in hard steel. Thick web helix delivers fast material removal combined with increased durability for maximum efficiency and performance. Each bit is manufactured to exacting specifications and features a split point that starts on contact with no walking or skating, eliminating the need for a center punch.
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Product Options
Available product options:53
Model number
Diameter (D) Inch
Working length (L1) Inch
Total length (L2) Inch
Pack quantity
CO2131
1/16
15/16
1 7/8
1
CO2132
5/64
-
2
1
CO2133
3/32
1 1/4
2 1/4
1
CO2134
7/64
1 1/2
2 5/8
1
CO2135
1/8
1 5/8
2 3/4
1
CO2136
9/64
1 3/4
2 7/8
1
CO2137
5/32
2
3 1/8
1
CO2138
11/64
2 1/8
3 1/4
1
CO2140
13/64
2 7/16
3 5/8
1
CO2142
15/64
2 5/8
3 7/8
1
CO2144
17/64
2 7/8
4 1/8
1
CO2145
9/32
3
4 1/4
1
CO2146
19/64
3
4 3/8
1
CO2147
5/16
3 3/16
4 1/2
1
CO2148
21/64
3 5/16
4 5/8
1
CO2149
11/32
3
4 3/4
1
CO2150
23/64
3 1/2
4 7/8
1
CO2151
3/8
3 5/8
5
1
CO2152
25/64
3 11/32
5 1/8
1
CO2153
13/32
3 11/32
5 1/4
1
CO2154
27/64
15/32
5 3/8
1
CO2155
7/16
3 1/2
5 1/2
1
CO2157
15/32
3 3/4
5 3/4
1
CO2158
31/64
3 7/8
5 7/8
1
CO2159
1/2
4
6
1
CO4128
1/64
3/16
3/4
12
CO4130
3/64
3/4
1 3/4
12
CO4131
1/16
7/8
1 7/8
12
CO4132
5/64
1
2
12
CO4133
3/32
1 1/4
2 1/4
12
CO4134
7/64
1 1/2
2 5/8
12
CO4135
1/8
1 5/8
2 3/4
12
CO4136
9/64
1 3/4
2 7/8
12
CO4137
5/32
2
3 1/8
12
CO4138
11/64
2 1/8
3 1/4
12
CO4140
13/64
2 1/2
3 5/8
12
CO4141
7/32
2
3 3/4
12
CO4142
15/64
2 3/4
3 7/8
12
CO4143
1/4
2 3/4
4
12
CO4144
17/64
2 7/8
4 1/8
6
CO4145
9/32
2 61/64
4 1/4
6
CO4146
19/64
3
4 3/8
6
CO4147
5/16
3 3/16
4 1/2
6
CO4148
21/64
3 5/16
4 5/8
6
CO4149
11/32
3 15/32
4 3/4
6
CO4150
23/64
3 1/2
4 7/8
6
CO4152
25/64
3 1/4
5 1/8
6
CO4154
27/64
3 15/32
5 3/8
6
CO4155
7/16
3 1/2
5 1/2
6
CO4156
29/64
3 1/2
5 5/8
6
CO4157
15/32
3 3/4
5 3/4
6
CO4158
31/64
3 7/8
5 7/8
6
CO4159
1/2
4
6
6
out of products
1/16 In. x 1-7/8 In. Cobalt Drill Bit
Model number CO2131
Pack quantity
1
CO2131 1/16 In. x 1-7/8 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
1/16
Working length (L1) Inch
15/16
Total length (L2) Inch
1 7/8
5/64 In. x 2 In. Cobalt Drill Bit
Model number CO2132
Pack quantity
1
CO2132 5/64 In. x 2 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
5/64
Working length (L1) Inch
-
Total length (L2) Inch
2
3/32 In. x 2-1/4 In. Cobalt Drill Bit
Model number CO2133
Pack quantity
1
CO2133 3/32 In. x 2-1/4 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
3/32
Working length (L1) Inch
1 1/4
Total length (L2) Inch
2 1/4
7/64 In. x 2-5/8 In. Cobalt Drill Bit
Model number CO2134
Pack quantity
1
CO2134 7/64 In. x 2-5/8 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
7/64
Working length (L1) Inch
1 1/2
Total length (L2) Inch
2 5/8
1/8 In. x 2-3/4 In. Cobalt Drill Bit
Model number CO2135
Pack quantity
1
CO2135 1/8 In. x 2-3/4 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
1/8
Working length (L1) Inch
1 5/8
Total length (L2) Inch
2 3/4
9/64 In. x 2-7/8 In. Cobalt Drill Bit
Model number CO2136
Pack quantity
1
CO2136 9/64 In. x 2-7/8 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
9/64
Working length (L1) Inch
1 3/4
Total length (L2) Inch
2 7/8
5/32 In. x 3-1/8 In. Cobalt Drill Bit
Model number CO2137
Pack quantity
1
CO2137 5/32 In. x 3-1/8 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
5/32
Working length (L1) Inch
2
Total length (L2) Inch
3 1/8
11/64 In. x 3-1/4 In. Cobalt Drill Bit
Model number CO2138
Pack quantity
1
CO2138 11/64 In. x 3-1/4 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
11/64
Working length (L1) Inch
2 1/8
Total length (L2) Inch
3 1/4
13/64 In. x 3-5/8 In. Cobalt Drill Bit
Model number CO2140
Pack quantity
1
CO2140 13/64 In. x 3-5/8 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
13/64
Working length (L1) Inch
2 7/16
Total length (L2) Inch
3 5/8
15/64 In. x 3-7/8 In. Cobalt Drill Bit
Model number CO2142
Pack quantity
1
CO2142 15/64 In. x 3-7/8 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
15/64
Working length (L1) Inch
2 5/8
Total length (L2) Inch
3 7/8
17/64 In. x 4-1/8 In. Cobalt Drill Bit
Model number CO2144
Pack quantity
1
CO2144 17/64 In. x 4-1/8 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
17/64
Working length (L1) Inch
2 7/8
Total length (L2) Inch
4 1/8
9/32 In. x 4-1/4 In. Cobalt Drill Bit
Model number CO2145
Pack quantity
1
CO2145 9/32 In. x 4-1/4 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
9/32
Working length (L1) Inch
3
Total length (L2) Inch
4 1/4
19/64 In. x 4-3/8 In. Cobalt Drill Bit
Model number CO2146
Pack quantity
1
CO2146 19/64 In. x 4-3/8 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
19/64
Working length (L1) Inch
3
Total length (L2) Inch
4 3/8
5/16 In. x 4-1/2 In. Cobalt Drill Bit
Model number CO2147
Pack quantity
1
CO2147 5/16 In. x 4-1/2 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
5/16
Working length (L1) Inch
3 3/16
Total length (L2) Inch
4 1/2
21/64 In. x 4-5/8 In. Cobalt Drill Bit
Model number CO2148
Pack quantity
1
CO2148 21/64 In. x 4-5/8 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
21/64
Working length (L1) Inch
3 5/16
Total length (L2) Inch
4 5/8
11/32 In. x 4-3/4 In. Cobalt Drill Bit
Model number CO2149
Pack quantity
1
CO2149 11/32 In. x 4-3/4 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
11/32
Working length (L1) Inch
3
Total length (L2) Inch
4 3/4
23/64 In. x 4-7/8 In. Cobalt Drill Bit
Model number CO2150
Pack quantity
1
CO2150 23/64 In. x 4-7/8 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
23/64
Working length (L1) Inch
3 1/2
Total length (L2) Inch
4 7/8
3/8 In. x 5 In. Cobalt Drill Bit
Model number CO2151
Pack quantity
1
CO2151 3/8 In. x 5 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
3/8
Working length (L1) Inch
3 5/8
Total length (L2) Inch
5
25/64 In. x 5-1/8 In. Cobalt Drill Bit
Model number CO2152
Pack quantity
1
CO2152 25/64 In. x 5-1/8 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
25/64
Working length (L1) Inch
3 11/32
Total length (L2) Inch
5 1/8
13/32 In. x 5-1/4 In. Cobalt Drill Bit
Model number CO2153
Pack quantity
1
CO2153 13/32 In. x 5-1/4 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
13/32
Working length (L1) Inch
3 11/32
Total length (L2) Inch
5 1/4
27/64 In. x 5-3/8 In. Cobalt Drill Bit
Model number CO2154
Pack quantity
1
CO2154 27/64 In. x 5-3/8 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
27/64
Working length (L1) Inch
15/32
Total length (L2) Inch
5 3/8
7/16 In. x 5-1/2 In. Cobalt Drill Bit
Model number CO2155
Pack quantity
1
CO2155 7/16 In. x 5-1/2 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
7/16
Working length (L1) Inch
3 1/2
Total length (L2) Inch
5 1/2
15/32 In. x 5-3/4 In. Cobalt Drill Bit
Model number CO2157
Pack quantity
1
CO2157 15/32 In. x 5-3/4 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
15/32
Working length (L1) Inch
3 3/4
Total length (L2) Inch
5 3/4
31/64 In. x 5-7/8 In. Cobalt Drill Bit
Model number CO2158
Pack quantity
1
CO2158 31/64 In. x 5-7/8 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
31/64
Working length (L1) Inch
3 7/8
Total length (L2) Inch
5 7/8
1/2 In. x 6 In. Cobalt Drill Bit
Model number CO2159
Pack quantity
1
CO2159 1/2 In. x 6 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
1/2
Working length (L1) Inch
4
Total length (L2) Inch
6
12 pieces 1/64 In. x 3/4 In. Cobalt Drill Bit
Model number CO4128
Pack quantity
12
CO4128 12 pc. 1/64 In. x 3/4 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
1/64
Working length (L1) Inch
3/16
Total length (L2) Inch
3/4
12 pieces 3/64 In. x 1-3/4 In. Cobalt Drill Bit
Model number CO4130
Pack quantity
12
CO4130 12 pc. 3/64 In. x 1-3/4 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
3/64
Working length (L1) Inch
3/4
Total length (L2) Inch
1 3/4
12 pieces 1/16 In. x 1-7/8 In. Cobalt Drill Bit
Model number CO4131
Pack quantity
12
CO4131 12 pc. 1/16 In. x 1-7/8 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
1/16
Working length (L1) Inch
7/8
Total length (L2) Inch
1 7/8
12 pieces 5/64 In. x 2 In. Cobalt Drill Bit
Model number CO4132
Pack quantity
12
CO4132 12 pc. 5/64 In. x 2 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
5/64
Working length (L1) Inch
1
Total length (L2) Inch
2
12 pieces 3/32 In. x 2-1/4 In. Cobalt Drill Bit
Model number CO4133
Pack quantity
12
CO4133 12 pc. 3/32 In. x 2-1/4 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
3/32
Working length (L1) Inch
1 1/4
Total length (L2) Inch
2 1/4
12 pieces 7/64 In. x 2-5/8 In. Cobalt Drill Bit
Model number CO4134
Pack quantity
12
CO4134 12 pc. 7/64 In. x 2-5/8 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
7/64
Working length (L1) Inch
1 1/2
Total length (L2) Inch
2 5/8
12 pieces 1/8 In. x 2-3/4 In. Cobalt Drill Bit
Model number CO4135
Pack quantity
12
CO4135 12 pc. 1/8 In. x 2-3/4 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
1/8
Working length (L1) Inch
1 5/8
Total length (L2) Inch
2 3/4
12 pieces 9/64 In. x 2-7/8 In. Cobalt Drill Bit
Model number CO4136
Pack quantity
12
CO4136 12 pc. 9/64 In. x 2-7/8 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
9/64
Working length (L1) Inch
1 3/4
Total length (L2) Inch
2 7/8
12 pieces 5/32 In. x 3-1/8 In. Cobalt Drill Bit
Model number CO4137
Pack quantity
12
CO4137 12 pc. 5/32 In. x 3-1/8 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
5/32
Working length (L1) Inch
2
Total length (L2) Inch
3 1/8
12 pieces 11/64 In. x 3-1/4 In. Cobalt Drill Bit
Model number CO4138
Pack quantity
12
CO4138 12 pc. 11/64 In. x 3-1/4 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
11/64
Working length (L1) Inch
2 1/8
Total length (L2) Inch
3 1/4
12 pieces 13/64 In. x 3-5/8 In. Cobalt Drill Bit
Model number CO4140
Pack quantity
12
CO4140 12 pc. 13/64 In. x 3-5/8 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
13/64
Working length (L1) Inch
2 1/2
Total length (L2) Inch
3 5/8
12 pieces 7/32 In. x 3-3/4 In. Cobalt Drill Bit
Model number CO4141
Pack quantity
12
CO4141 12 pc. 7/32 In. x 3-3/4 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
7/32
Working length (L1) Inch
2
Total length (L2) Inch
3 3/4
12 pieces 15/64 In. x 3-7/8 In. Cobalt Drill Bit
Model number CO4142
Pack quantity
12
CO4142 12 pc. 15/64 In. x 3-7/8 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
15/64
Working length (L1) Inch
2 3/4
Total length (L2) Inch
3 7/8
12 pieces 1/4 In. x 4 In. Cobalt Drill Bit
Model number CO4143
Pack quantity
12
CO4143 12 pc. 1/4 In. x 4 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
1/4
Working length (L1) Inch
2 3/4
Total length (L2) Inch
4
12 pieces 17/64 In. x 4-1/8 In. Cobalt Drill Bit
Model number CO4144
Pack quantity
6
CO4144 12 pc. 17/64 In. x 4-1/8 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
17/64
Working length (L1) Inch
2 7/8
Total length (L2) Inch
4 1/8
12 pieces 9/32 In. x 4-1/4 In. Cobalt Drill Bit
Model number CO4145
Pack quantity
6
CO4145 12 pc. 9/32 In. x 4-1/4 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
9/32
Working length (L1) Inch
2 61/64
Total length (L2) Inch
4 1/4
12 pieces 19/64 In. x 4-3/8 In. Cobalt Drill Bit
Model number CO4146
Pack quantity
6
CO4146 12 pc. 19/64 In. x 4-3/8 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
19/64
Working length (L1) Inch
3
Total length (L2) Inch
4 3/8
12 pieces 5/16 In. x 4-1/2 In. Cobalt Drill Bit
Model number CO4147
Pack quantity
6
CO4147 12 pc. 5/16 In. x 4-1/2 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
5/16
Working length (L1) Inch
3 3/16
Total length (L2) Inch
4 1/2
12 pieces 21/64 In. x 4-5/8 In. Cobalt Drill Bit
Model number CO4148
Pack quantity
6
CO4148 12 pc. 21/64 In. x 4-5/8 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
21/64
Working length (L1) Inch
3 5/16
Total length (L2) Inch
4 5/8
12 pieces 11/32 In. x 4-3/4 In. Cobalt Drill Bit
Model number CO4149
Pack quantity
6
CO4149 12 pc. 11/32 In. x 4-3/4 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
11/32
Working length (L1) Inch
3 15/32
Total length (L2) Inch
4 3/4
12 pieces 23/64 In. x 4-7/8 In. Cobalt Drill Bit
Model number CO4150
Pack quantity
6
CO4150 12 pc. 23/64 In. x 4-7/8 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
23/64
Working length (L1) Inch
3 1/2
Total length (L2) Inch
4 7/8
12 pieces 25/64 In. x 5-1/8 In. Cobalt Drill Bit
Model number CO4152
Pack quantity
6
CO4152 12 pc. 25/64 In. x 5-1/8 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
25/64
Working length (L1) Inch
3 1/4
Total length (L2) Inch
5 1/8
12 pieces 27/64 In. x 5-3/8 In. Cobalt Drill Bit
Model number CO4154
Pack quantity
6
CO4154 12 pc. 27/64 In. x 5-3/8 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
27/64
Working length (L1) Inch
3 15/32
Total length (L2) Inch
5 3/8
12 pieces 7/16 In. x 5-1/2 In. Cobalt Drill Bit
Model number CO4155
Pack quantity
6
CO4155 12 pc. 7/16 In. x 5-1/2 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
7/16
Working length (L1) Inch
3 1/2
Total length (L2) Inch
5 1/2
12 pieces 29/64 In. x 5-5/8 In. Cobalt Drill Bit
Model number CO4156
Pack quantity
6
CO4156 12 pc. 29/64 In. x 5-5/8 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
29/64
Working length (L1) Inch
3 1/2
Total length (L2) Inch
5 5/8
12 pieces 15/32 In. x 5-3/4 In. Cobalt Drill Bit
Model number CO4157
Pack quantity
6
CO4157 12 pc. 15/32 In. x 5-3/4 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
15/32
Working length (L1) Inch
3 3/4
Total length (L2) Inch
5 3/4
12 pieces 31/64 In. x 5-7/8 In. Cobalt Drill Bit
Model number CO4158
Pack quantity
6
CO4158 12 pc. 31/64 In. x 5-7/8 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
Details
Diameter (D) Inch
31/64
Working length (L1) Inch
3 7/8
Total length (L2) Inch
5 7/8
6 pieces 1/2 In. x 6 In. Cobalt Drill Bit
Model number CO4159
Pack quantity
6
CO4159 6 pc. 1/2 In. x 6 In. Cobalt Drill Bit
41 of 41 reviewers received a sample product or took part in a promotion
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