Best 27/64 Drill Bit Sets for Metal, Stainless Steel, and Hardwood Projects
Need a reliable 27/64 inch drill bit for metalworking, stainless steel, or tough alloys? This guide identifies five top options from reputable brands, explains who each product is best for, and highlights key features to help you choose quickly. Whether you’re a DIYer, a professional tradesperson, or a hobbyist tackling hardened metals, these bits offer durability, speed, and precision.
Product Quick Reference
- BECOLLO 27/64 Inch Cobalt Drill Bit Set — Best for hard metals and long life
- Drill America KFDRSD3/8X27/64 27/64″ Reduced Shank — Best for general-purpose use with robust shank
- Drill America 27/64″ High Speed Steel Black & Gold KFD Split Point — Best for versatility across materials
- 27/64 Inch Drill Bit (3 Pack) Industrial Grade M35 Cobalt Titanium Nitride Coating — Best value in a multi-pack
- Bosch BL2154 27/64 in. x 5-3/8 in. Jobber Black Oxide — Best for fast drilling and longevity in metal
BECOLLO 27/64 Inch Cobalt Drill Bit Set
What it is: A 3-piece cobalt alloy twist drill bit set designed for hard metals, including stainless steel and cast iron. Brand: BECOLLO. Data: 5% cobalt HSS, smooth surface due to full grinding, 135° split point for fast self-centering.
Best for: Metalworkers who need longer bit life and improved heat resistance for frequent drilling in hard alloys. The 5% cobalt composition boosts wear and heat resistance, making these bits suitable for stainless steel and cast iron.
Why chosen: The combination of cobalt hardening, refined grinding, and a 135° split point reduces walking and increases cutting speed in tough metals. The small 3-piece set makes it ideal as a starter cobalt option or for stocking a metal workshop with reliable drill bits.
Caution: As with cobalt bits, they can be more brittle in extremely thin materials; use steady feeds and avoid overheating in thin metals.
Drill America KFDRSD3/8X27/64 27/64″ Reduced Shank High Speed Steel
What it is: A KFD Series 27/64″ drill bit with a 3/8″ shank and black/gold coating for hard materials. Brand: Drill America.
Best for: Users needing a versatile, wear-resistant bit that fits standard drill chucks and works well in stainless steel and other hard metals.
Why chosen: The gold/black surface treatment implies improved performance in harder metals, and the round shank supports a wide range of toolholding systems—helpful for those who switch between machines.
Caution: Reduced shank may limit compatibility with some very high-torque setups; verify shank fit for your specific chuck type before use.
Drill America 27/64″ High Speed Steel KFD Split Point (Pack of 6)
What it is: A six-pack of HSS drill bits with KFD black/gold coating and a 135° split point. Brand: Drill America.
Best for: General purpose drilling across wood, metal, and stainless steel, especially when you need a reliable pack for mixed projects.
Why chosen: The 135° split point helps prevent walking, making it a practical choice for hobbyists and professionals who work with varied materials and want dependable performance in one purchase.
Caution: While versatile, HSS with black/gold coating may show wear sooner than cobalt options in extremely hard metals; consider cobalt for frequent stainless drilling.
27/64 Inch Drill Bit (3 Pack) Industrial Grade M35 Cobalt TiN
What it is: A three-pack of M35 cobalt bits with titanium aluminum nitride (TiAIN) coating for enhanced hardness and wear resistance. Brand: Yellow Paw.
Best for: Budget-conscious users needing multiple cobalt-coated bits for metal drilling, especially into stainless steel and hardened materials.
Why chosen: The TiAIN coating reduces oxidation and increases durability, while the 135° split point minimizes walking on harder metals. The three-pack offers good value for stocking a metal shop or toolbox.
Caution: Coated bits can be more brittle if overheated; maintain steady feed rates and avoid excessive drilling speeds in thick metals.
Bosch BL2154 27/64 in. Jobber Black Oxide
What it is: A Bosch 27/64 in. jobber drill bit with black oxide finish. Brand: Bosch.
Best for: Fast drilling with reduced heat buildup, particularly when working with metal and stainless steel, where longevity and speed matter.
Why chosen: Bosch’s Speed Helix design promises faster drilling and longer life than standard bits, making it a solid pick for frequent metal drilling. The 5-3/8 in. length supports deeper drilling in metal.
Caution: Black oxide bits can wear more quickly in very hard metals; consider cobalt-coated options for frequent stainless drilling or extended use.
Buying Guide: How to Choose Your 27/64 Drill Bit
What material will you drill? For hard metals like stainless steel or cast iron, cobalt alloys (M35) deliver higher heat resistance and longer life than standard high-speed steel. For mixed tasks, high-speed steel with coating can cover many needs at a lower cost.
What is your drilling environment? If you work with noisy impact drivers or quick-change setups, a hex shank or split-point design can help prevent walking and improve speed.
Coatings matter. TiN/TiAIN coatings reduce wear and friction, extending life in tough metals. Black oxide finishes can improve corrosion resistance and cutting efficiency on certain metals but may wear faster under heavy use.
Shank and chuck compatibility. Ensure your drill or impact driver accepts the shank size and profile (round vs. multi-flat) listed. A reduced shank may offload chuck capacity in smaller tools, while hex shanks are designed for quick-change systems.
Pack size and value. If you’re building a metal workshop, multi-pack options offer value but verify that the included bits meet your most common diameters and lengths. For professional work, consider a cobalt-heavy option for longevity in stainless steel work.
FAQ
- What does 27/64 inch mean? It refers to the drill bit’s diameter. The 27/64 inch size is common for metal drilling and is compatible with many standard drill chucks.
- When should I choose cobalt vs. high-speed steel? Choose cobalt (M35) for frequent drilling in hard metals like stainless steel and cast iron. High-speed steel is adequate for general-purpose metal and wood drilling, typically at a lower cost.
- What is a split point and why is it useful? A split point (commonly 135°) helps the bit self-center and reduces walking, particularly when drilling into metal or hardened surfaces.
- Are coated bits better? Coatings like TiN or TiAIN improve hardness and reduce friction, extending bit life in tough materials. For the hardest metals, cobalt-coated bits often perform best.
- Can I use these bits in a hand drill? Yes, most 27/64″ bits with round shanks fit standard hand drills, but verify compatibility with your chuck size and torque to avoid slipping or breakage.
- How many bits should I start with? A small starter set (2–3 bits) for different metals works well, while a larger pack is better for ongoing projects or professional use.