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CO18
CO4029
Cobalt Drill Bit Sets
Bosch cobalt drill bits offer the best heat resistance and rigid thick web design for
drilling in extremely hard and abrasive materials such as treated stainless steel
(precipitation-hardened), cast iron and titanium.
• A tough cobalt alloy delivers heat resistance up to 1100° Fahrenheit allowing
the bit to perform for extended periods of time in the most abrasive materials
without failing due to the high heat levels. Overall bit hardness of 66-68 HRC from
the cobalt formulation gives the ability to penetrate exceptionally tough materials
• 135° split point starts on contact with no walking or skating and no center
punch is required
Item #
# of Pieces
CO10
10
CO4013
13
CO18
18
CO4029
29
Reversible Geared Three-Jaw Chuck Kits
• Kits include: chuck key; metric and standard
mounting screws – coated and hardened and
complete instructions.
Chuck
Item #
Size#
Rating
Capacity
CKK002
3/8"
Heavy
1/16" - 3/8"
CKK003
3/8"
Extra-Heavy
1/16" - 3/8"
CKK004
3/8"
Heavy
1/16" - 3/8"
CKK005
1/2"
Heavy
5/64" - 1/2"
200
Boschtools.com
Dr illi ng
M eta l
Description
10 pc. set in blow-molded plastic case
Fractional jobber length 1/16" to 1/4" by
64ths in metal index
18 pc. set in blow-molded plastic case
Fractional jobber length 1/16" to 1/2" by
64ths in metal index
Bit
Mount
Application
Fits all brands
3/8" - 24
of cordless and
corded drills.
Fits all brands
3/8" - 24
of cordless and
1/2" - 20
corded drills and
1/2" - 20
hammer drills.
Toll Free: 877-BOSCH-99
Cobalt Drill Bits
Overall
Item #
Diameter
Length
Carded Items
CO2131
1/16"
1-7/8"
CO2132
5/64"
CO2133
3/32"
2-1/4"
CO2134
7/64"
2-5/8"
CO2135
1/8"
2-3/4"
CO2136
9/64"
2-7/8"
CO2137
5/32"
3-1/8"
CO2138
11/64"
3-1/4"
CO2139
3/16"
3-1/2"
CO2140
13/64"
3-5/8"
CO2141
7/32"
3-3/4"
CO2142
15/64"
3-7/8"
CO2143
1/4"
CO2144
17/64"
4-1/8"
CO2145
9/32"
4-1/4"
CO2146
19/64"
4-3/8"
CO2147
5/16"
4-1/2"
CO2148
21/64"
4-5/8"
CO2149
11/32"
4-3/4"
CO2150
23/64"
4-7/8"
CO2151
3/8"
CO2152
25/64"
5-1/8"
CO2153
13/32"
5-1/4"
CO2154
27/64"
5-3/8"
CO2155
7/16"
5-1/2"
CO2156
29/64"
5-5/8"
CO2157
15/32"
5-3/4"
CO2158
31/64"
5-7/8"
CO2159
1/2"
Bulk Items
CO4128
1/64"
3/4"
CO4129
1/32"
1-3/8"
CO4130
3/64"
1-3/4"
CO4131
1/16"
1-7/8"
CO4132
5/64"
CO4133
3/32"
2-1/4"
CO4134
7/64"
2-5/8"
CO4135
1/8"
2-3/4"
CO4136
9/64"
2-7/8"
CO4137
5/32"
3-1/8"
CO4138
11/64"
3-1/4"
CO4139
3/16"
3-1/2"
CO4140
13/64"
3-5/8"
CO4141
7/32"
3-3/4"
CO4142
15/64"
3-7/8"
CO4143
1/4"
CO4144
17/64"
4-1/8"
CO4145
9/32"
4-1/4"
CO4146
19/64"
4-3/8"
CO4147
5/16"
4-1/2"
CO4148
21/64"
4-5/8"
CO4149
11/32"
4-3/4"
CO4150
23/64"
4-7/8"
CO4151
3/8"
CO4152
25/64"
5-1/8"
CO4153
13/32"
5-1/4"
CO4154
27/64"
5-3/8"
CO4155
7/16"
5-1/2"
CO4156
29/64"
5-5/8"
CO4157
15/32"
5-3/4"
CO4158
31/64"
5-7/8"
CO4159
1/2"
Shank
Diameter
Quantity
1/16"
1
2"
5/64"
1
3/32"
1
7/64"
1
1/8"
1
9/64"
1
5/32"
1
11/64"
1
3/16"
1
13/64"
1
7/32"
1
15/64"
1
4"
1/4"
1
17/64"
1
9/32"
1
19/64"
1
5/16"
1
21/64"
1
11/32"
1
23/64"
1
5"
3/8"
1
25/64"
1
13/32"
1
27/64"
1
7/16"
1
29/64"
1
15/32"
1
31/64"
1
6"
1/2"
1
1/64"
12
1/32"
12
3/64"
12
1/16"
12
2"
5/64"
12
3/32"
12
7/64"
12
1/8"
12
9/64"
12
5/32"
12
11/64"
12
3/16"
12
13/64"
12
7/32"
12
15/64"
12
4"
1/4"
12
17/64"
6
9/32"
6
19/64"
6
5/16"
6
21/64"
6
11/32"
6
23/64"
6
5"
3/8"
6
25/64"
6
13/32"
6
27/64"
6
7/16"
6
29/64"
6
15/32"
6
31/64"
6
6"
1/2"
6
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