Best Drill Bits for Galvanized Steel: Five Sets Compared
M35 or M42 cobalt bits are the strongest choices in this group for drilling galvanized steel, particularly when durability and heat resistance matter. The BOSCH set is best for buyers prioritizing M42 cobalt, while the two MACXCOIP sets offer M35 cobalt across either a compact or broad size range. NordWolf is better for tight spaces, and DEWALT is a general-purpose option for buyers who also drill wood and plastic.
| Product | Best For | Notable Feature |
|---|---|---|
| BOSCH CO14B | Durability-focused metal drilling | M42 cobalt alloy |
| MACXCOIP 29-Piece | More hole-size options | Sizes from 1/16 to 1/2 inch |
| MACXCOIP 13-Piece | Common smaller holes | Sizes from 1/16 to 1/4 inch |
| NordWolf 5-Piece | Tight or hard-to-reach spaces | Short bits with 1/4-inch hex shanks |
| DEWALT DW1361 | Mixed-material projects | Titanium nitride coating and pilot point |
BOSCH CO14B 14-Piece Cobalt Drill Bit Set
Best for: Buyers who want a cobalt set specified for demanding metal drilling. The BOSCH CO14B uses M42 cobalt alloy with 8% cobalt, and the listed features describe high heat resistance and use with stainless steel, cast iron, titanium, light-gauge metal, and aluminum. Its jobber-length design and case make it a practical choice for a metal-focused kit.
The surface-hardened tip is intended to penetrate tough, abrasive materials. These stated features make the set a strong candidate for galvanized steel work where a durable metal bit is preferred. However, the listed details do not provide the individual bit sizes, so check the size range before choosing it for a specific hole.
MACXCOIP 29-Piece M35 Cobalt Drill Bit Set
Best for: Buyers who need a wide selection of hole sizes. This M35 cobalt set runs from 1/16 inch to 1/2 inch and includes 29 sizes. Its listed 135-degree point and twist design are intended to self-center and help remove chips. The features also identify use on hard metals, stainless steel, cast iron, wood, and plastic.
This set is a better fit than the 13-piece option when a project may require larger holes or more incremental size choices. Its broad size range is the main reason to select it for varied galvanized steel tasks. A larger set may be unnecessary if you only need small, common holes.
MACXCOIP 13-Piece M35 Cobalt Drill Bit Set
Best for: Buyers who mainly drill smaller holes and want a compact size range. The 13 bits span 1/16 inch to 1/4 inch. The M35 cobalt construction is listed for stainless steel, cast iron, copper, aluminum, and other materials. A 135-degree point and twist design are described as supporting self-centering and chip removal.
Choose this set over the 29-piece version if its smaller range matches your work and you do not need bits larger than 1/4 inch. The included index storage case keeps the set together. Its size range is the limitation: it does not cover larger holes in the other MACXCOIP set.
NordWolf 5-Piece M35 Cobalt Stubby Set
Best for: Buyers drilling galvanized steel in confined spaces. These stubby bits measure 1.83 to 2.32 inches, and the product listing describes them as suited to hard-to-reach areas. The five-piece set has M35 cobalt bits, 135-degree split points, and 1/4-inch hex shanks for standard and quick-change chucks and drivers.
The short length is the key reason to choose NordWolf when a longer bit is difficult to position. The set is listed for stainless steel and several hardened metals. Its five-piece count offers fewer sizes than either MACXCOIP set, so it is less suitable when size variety is the priority.
DEWALT DW1361 21-Piece Titanium Nitride Set
Best for: Buyers who want one listed set for wood, metal, and plastic projects. The 21-piece kit has titanium nitride coating, pilot points described as starting on contact for cleaner holes, and no-spin shanks. These features make it a versatile option for general material drilling.
It may suit occasional galvanized steel work, but the provided product details do not specify cobalt construction or list hardened-metal performance. Choose a cobalt set instead if metal drilling is frequent or durability in tougher metals is the main concern.
Buying Guide: How to Choose Drill Bits for Galvanized Steel
Which bit material should you choose?
For repeated metal drilling, compare the listed cobalt options first. The BOSCH set specifies M42 cobalt alloy, while the MACXCOIP and NordWolf sets specify M35 cobalt. The DEWALT set lists a titanium nitride coating, but its supplied details do not identify cobalt content. Match the material description to how often and how demanding your metal-drilling work is.
What size range do you need?
Plan for the hole diameters in your project before buying. The MACXCOIP 13-piece set covers 1/16 to 1/4 inch; its 29-piece counterpart extends to 1/2 inch. NordWolf prioritizes access and compact length over a large assortment. The BOSCH size range is not stated in the supplied product details.
How can you drill galvanized steel carefully?
Secure the workpiece and use a suitable drill bit for metal. Apply steady pressure rather than forcing the bit, and avoid letting the bit overheat. Drilling can disturb the zinc coating around a hole, so consider how the exposed area will be protected for the application. Follow the tool and workpiece manufacturers’ safety guidance, and wear appropriate eye protection.
Frequently Asked Questions
Are cobalt drill bits suitable for galvanized steel?
Cobalt bits are a reasonable choice for metal drilling, especially when durability and heat resistance are priorities. Confirm that the size and bit style fit the specific task.
Is M42 better than M35 for this use?
The BOSCH listing specifies M42 cobalt with 8% cobalt and high heat resistance. The other cobalt options specify M35. The product details do not provide a direct comparative test, so choose based on stated features and required sizes.
Which set has the most size options?
The MACXCOIP 29-piece set has the broadest stated range, from 1/16 inch through 1/2 inch.
Which set is best for tight spaces?
The NordWolf set is the clearest fit because its bits are described as stubby and measure 1.83 to 2.32 inches.
Can a titanium nitride set drill galvanized steel?
The DEWALT listing includes metal among its intended materials, but the provided details do not specify performance on galvanized steel or hardened metal. Consider a listed cobalt set when metal-focused features are important.