Best 37/64 Drill Bit Options for Metal Working and Precision Drilling
If you’re drilling 37/64″ holes, you need strong guidance on the right cobalt and high-speed steel bits for metal, stainless steel, and other alloys. This guide highlights five top 37/64 drill bits, each suited to different job types—from general-purpose metal drilling to hard materials. Read on to identify which bit excels for your project, whether you’re a professional fabricator, a hobbyist, or a maintenance technician.
| Product | Best For | Key Benefit | Tip |
|---|---|---|---|
| Drill America KFD3F | General metal drilling | 135° split point for self-centering | Wont walk on hard metals |
| Narwhal 3-Pack | Hard metals and precision work | 5% cobalt for heat resistance | Includes plastic storage case |
| Satcrft 37/64 | Stainless steel and alloys | 135° split point, smooth hole | Balanced for accuracy |
| Meccion Cobalt 37/64 | Cast iron, stainless steel, hard metals | 5% cobalt with M35 alloy | Long life and precision |
| Miskamro 37/64 TiAlN | High-temp metal drilling | TiAlN coating for wear protection | Hard coating supports high speeds |
Drill America 37/64″ Reduced Shank High Speed Steel KFD3F
Brand: Drill America
What it is best for: General metal drilling across aluminum, iron, steel, and other alloys. The contractor-grade bit is designed for repeated use in tougher materials.
Why chosen: It features a 135-degree split point that centers itself and reduces thrust, helping to prevent walking on hard metals. The reduced shank fits common drill chucks and promotes stability during deep drilling.
Caution: As with all high-speed steel bits used on hard metals, heat buildup can occur. Use appropriate lubrication and avoid forcing the bit through extremely hard materials without pecking.
Narwhal 37/64 Cobalt Drill Bits — 3 Pack
Brand: Narwhal
What it is best for: Hard metals like stainless steel and cast iron, where heat resistance is crucial. The 5% cobalt content enhances edge retention during ambitious drilling tasks.
Why chosen: The 135° split point minimizes walking, and the bits arrive fully ground for precise hole placement. A plastic storage case helps keep the bits organized between jobs.
Caution: Cobalt bits are sharper and more brittle than standard HSS—avoid abusing the edge by applying side pressure or drilling through extremely thick, layered materials without proper coolant.
Satcrft 37/64 Inch Cobalt Drill Bit — M35 HSS
Brand: Satcrft
What it is best for: Stainless steel, cast iron, and other hardened metals where heat resistance matters. Its M35 cobalt composition supports longer life under demanding drilling conditions.
Why chosen: The 135-degree split point and straight shank deliver stable and precise results, reducing wandering and ensuring concentric holes in tough metals.
Caution: Higher cobalt content can make the bit a bit tougher to sharpen and more prone to chipping if mishandled during aggressive drilling.
Meccion Cobalt Drill Bit 37/64” — M35
Brand: Meccion
What it is best for: Drilling in cast iron and stainless steel, with broad applicability to copper and non-ferrous alloys. The 5% cobalt alloy is designed for extended service life under heat.
Why chosen: The 135° pilot point helps reduce walking, while the straight round shank improves concentricity for precise results in metal drilling tasks.
Caution: As with many cobalt bits, avoid overheating without proper lubrication, especially during fast drilling in very hard materials.
Miskamro 37/64 M35 Cobalt Drill Bit, TiAlN Coated
Brand: Miskamro
What it is best for: Metals requiring high-temperature resistance and wear protection. TiAlN coating provides a thermal shield for extended cutting life.
Why chosen: The 5% cobalt content (M35) and the TiAlN coating together offer strong performance for heavy-duty metal drilling, particularly in high-speed applications.
Caution: Coatings can wear with aggressive use; avoid unnecessary high-speed drilling in soft materials that could undermine edge precision.
Buying Guide: Key Considerations For 37/64 Drill Bits
- Material compatibility: Choose cobalt (5% Co) for stainless steel and hard alloys; high-speed steel is suitable for general metal drilling but wears faster on hard metals.
- Tip design: A 135° split point minimizes walking and improves center-punch accuracy in hard metals. A good tip design reduces chatter and increases first-pass success.
- Shank type and compatibility: Ensure your drill chuck accepts a 3/8″ shank or 1/2″ reduced shank as needed. A straight shank improves concentricity in many drill holders.
- Coatings and heat resistance: TiAlN coatings offer heat protection and extended life for high-speed metal drilling. Cobalt alloy bits resist heat better than standard HSS.
- Size and length: Longer bits can reach deeper holes in metal, but shorter bits often provide more rigidity for precision work. Balance length with the drill’s capacity.
- Storage and organization: A case or labeled storage helps prevent loss and damage, especially for multi-packs like Narwhal’s).
Frequently Asked Questions
What does 37/64″ refer to? It is the diameter of the drill bit in inches, used for drilling holes with that specific width.
When should I use cobalt vs HSS bits? Cobalt bits excel in hard metals like stainless steel and cast iron, especially under heat. HSS bits are adequate for general metal drilling and lightweight metals.
Do coated bits really last longer? Coatings like TiAlN reduce wear and heat buildup, potentially extending life in demanding drilling, but performance also depends on material and speed.
What is a split point and why care? A 135° split point helps the bit start cutting immediately, reducing wandering and improving hole accuracy in hard metals.
How should I lubricate during drilling? Use cutting oil or compatible lubricants to reduce heat and extend bit life, especially on stainless steel and hard alloys.
Is it better to buy a 3-pack or single bits? A multi-pack is cost-effective and convenient for frequent users, ensuring you have the right bit on hand for different materials.