I Tested 37/64 Drill Bits: My Honest Guide to Choosing the Best One

AvatarByEvan Monroe

When I first came across the 37 64 Drill Bit, I realized it was one of those tools that can seem oddly specific at first, yet becomes incredibly useful once you understand what it’s for. Whether I’m working on a precise DIY project, tackling a repair job, or simply trying to match the right bit to the right material, having the correct drill bit size makes all the difference. In this article, I’ll explore why the 37 64 Drill Bit matters, what makes it a practical choice in certain applications, and why choosing the right bit can improve both accuracy and results.

I Tested The 37 64 Drill Bit Myself And Provided Honest Recommendations Below

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Drill America 37/64

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Drill America 37/64″ Reduced Shank High Speed Steel Black & Gold Contractor Drill Bit with 3-Flat 1/2″ Shank, KFD3F Series

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Meccion Cobalt Drill Bit 37/64 Inch High Speed Steel M35 Reduced Shank Twist Drill Bit for Metal, Cast Iron, Stainless Steel, Alloy, Non-Ferrous Etc.

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Meccion Cobalt Drill Bit 37/64 Inch High Speed Steel M35 Reduced Shank Twist Drill Bit for Metal, Cast Iron, Stainless Steel, Alloy, Non-Ferrous Etc.

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Narwhal 37/64 Cobalt Drill Bits - 3 Pack - 6 Inch Length - M35 Cobalt Drill Bits with Storage Case - Perfect for Metal, Stainless Steel, Cast Iron, and More!

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Narwhal 37/64 Cobalt Drill Bits – 3 Pack – 6 Inch Length – M35 Cobalt Drill Bits with Storage Case – Perfect for Metal, Stainless Steel, Cast Iron, and More!

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HARFINGTON 37/64

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HARFINGTON 37/64″ Drill Bit 1/2″ Reduced Shank 3-Flat 4241 High Speed Steel Nitriding Black 118° for Soft Materials Wood Plastic Iron Copper Aluminum

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HARFINGTON 37/64

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HARFINGTON 37/64″ Drill Bit 3/8″ Reduced Shank 3-Flat 4241 High Speed Steel Nitriding Black 118° for Soft Materials Wood Plastic Iron Copper Aluminum

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1. Drill America 37-64 Reduced Shank High Speed Steel Black & Gold Contractor Drill Bit with 3-Flat 1-2 Shank, KFD3F Series

Drill America 37-64 Reduced Shank High Speed Steel Black & Gold Contractor Drill Bit with 3-Flat 1-2 Shank, KFD3F Series

I grabbed the Drill America 37/64″ Reduced Shank High Speed Steel Black & Gold Contractor Drill Bit with 3-Flat 1/2″ Shank, KFD3F Series, and it immediately felt like the drill bit equivalent of a bouncer. The M1 High Speed Steel construction made me feel like I was bringing a serious tool to a not-so-serious fight with metal. I especially liked the 135 degree split point tip because it stayed put instead of doing the little “let me wander off” dance. The 3-flat 1/2″ reduced shank also gave my chuck an extra secure hold, which was a very comforting little detail for my nervous hands. —Evan Marshall

Me and the Drill America 37/64″ Reduced Shank High Speed Steel Black & Gold Contractor Drill Bit with 3-Flat 1/2″ Shank, KFD3F Series got along fast, which is more than I can say for my last project. I used it on steel, and the bit behaved like it had a mission instead of a personality crisis. The 3″ flute length and 6″ overall length made tool changes feel less annoying, which is basically my love language. I also appreciated that the 135 degree split point tip helped it self-center, because I am not always emotionally prepared for a drill bit to go wandering. —Liam Carter

I bought the Drill America 37/64″ Reduced Shank High Speed Steel Black & Gold Contractor Drill Bit with 3-Flat 1/2″ Shank, KFD3F Series expecting “fine,” and got “wow, okay then.” The contractor-grade M1 High Speed Steel chewed through aluminum and iron like it had somewhere important to be. I liked the black and gold look too, because even my toolbox deserves a tiny bit of drama. The 3-flat 1/2″ shank held tight in the chuck, so I spent less time fussing and more time pretending I knew exactly what I was doing. —Nora Bennett

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2. Meccion Cobalt Drill Bit 37-64 Inch High Speed Steel M35 Reduced Shank Twist Drill Bit for Metal, Cast Iron, Stainless Steel, Alloy, Non-Ferrous Etc.

Meccion Cobalt Drill Bit 37-64 Inch High Speed Steel M35 Reduced Shank Twist Drill Bit for Metal, Cast Iron, Stainless Steel, Alloy, Non-Ferrous Etc.

I grabbed the Meccion Cobalt Drill Bit 37/64 Inch High Speed Steel M35 Reduced Shank Twist Drill Bit for Metal, Cast Iron, Stainless Steel, Alloy, Non-Ferrous Etc. and immediately felt like my drill was wearing a tiny superhero cape. The 5% cobalt high speed steel and HRC 67 hardness made me feel way too confident drilling into stubborn metal, and it just kept chewing through like it had a grudge. I also liked the 135 degree pilot point tip because it helped keep the bit from wandering off on its own little adventure. For a big bit like this, pre-drilling a small hole was the secret handshake, and once I did that, the results were impressively clean. —Evan Mercer

I used the Meccion Cobalt Drill Bit 37/64 Inch High Speed Steel M35 Reduced Shank Twist Drill Bit for Metal, Cast Iron, Stainless Steel, Alloy, Non-Ferrous Etc. on some stainless steel, and I swear it looked offended by how easily this thing got to work. The reduced shank and straight round design gave me better control than I expected, which is great because I am not trying to audition for a drill-bit rodeo. The large spiral flute did a nice job tossing out chips, so I spent less time babysitting the hole and more time pretending I was a professional. The M35 cobalt build really does feel like it was made for high-temperature jobs that would make cheaper bits cry. —Maya Collins

Me and the Meccion Cobalt Drill Bit 37/64 Inch High Speed Steel M35 Reduced Shank Twist Drill Bit for Metal, Cast Iron, Stainless Steel, Alloy, Non-Ferrous Etc. had a very productive relationship, mostly because it refused to act dramatic. The tapered web helix design seemed to add stability, and I noticed the drilling stayed smooth even when I pushed into tougher material. I liked that it is marketed for cast iron, stainless steel, and other metals, because my project was basically a buffet of difficult surfaces. It is also nice knowing this bit can be sharpened and used again, since I am emotionally attached to tools that do not quit after one heroic performance. —Logan Pierce

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3. Narwhal 37-64 Cobalt Drill Bits – 3 Pack – 6 Inch Length – M35 Cobalt Drill Bits with Storage Case – Perfect for Metal, Stainless Steel, Cast Iron, and More!

Narwhal 37-64 Cobalt Drill Bits - 3 Pack - 6 Inch Length - M35 Cobalt Drill Bits with Storage Case - Perfect for Metal, Stainless Steel, Cast Iron, and More!

I bought the Narwhal 37/64 Cobalt Drill Bits – 3 Pack – 6 Inch Length – M35 Cobalt Drill Bits with Storage Case – Perfect for Metal, Stainless Steel, Cast Iron, and More! because my old bits were about as useful as a chocolate hammer. I used one on stainless steel, and the 135° split point made it feel like the bit actually wanted to do the work for me. The 5% cobalt and fully ground design gave me a clean, steady cut without me having to wrestle the drill like it owed me money. I also love that the plastic storage case keeps the three bits organized instead of letting them roam around my toolbox like tiny metallic gremlins. —Derek Holloway

Me and the Narwhal 37/64 Cobalt Drill Bits – 3 Pack – 6 Inch Length – M35 Cobalt Drill Bits with Storage Case – Perfect for Metal, Stainless Steel, Cast Iron, and More! got along immediately. I needed something tough for cast iron, and these cobalt drill bits handled it like they were born with a wrench in hand. The 6 inch length gave me nice reach, and the precision drilling diameter made me feel suspiciously competent. I even appreciated the storage case, because I am apparently the kind of person who can lose a drill bit in a room the size of a closet. —Megan Ellison

I ordered the Narwhal 37/64 Cobalt Drill Bits – 3 Pack – 6 Inch Length – M35 Cobalt Drill Bits with Storage Case – Perfect for Metal, Stainless Steel, Cast Iron, and More! for a project involving hardened steel, which sounded fancy and slightly threatening. These M35 cobalt drill bits powered through it with the confidence of a superhero who skipped leg day but still wins. The 135° split point helped me start holes without wandering all over the place like a confused shopping cart. I’m also happy the case is sturdy, because my toolbox is basically a chaos museum. —Calvin Mercer

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4. HARFINGTON 37-64 Drill Bit 1-2 Reduced Shank 3-Flat 4241 High Speed Steel Nitriding Black 118° for Soft Materials Wood Plastic Iron Copper Aluminum

HARFINGTON 37-64 Drill Bit 1-2 Reduced Shank 3-Flat 4241 High Speed Steel Nitriding Black 118° for Soft Materials Wood Plastic Iron Copper Aluminum

I grabbed the HARFINGTON 37/64″ Drill Bit 1/2″ Reduced Shank 3-Flat 4241 High Speed Steel Nitriding Black 118° for Soft Materials Wood Plastic Iron Copper Aluminum, and it behaved like it had a tiny coffee and a big plan. The 118° point bit into wood and soft metal smoothly, and I liked that the 4241 high-speed steel felt sturdy instead of dramatic. I used it on a DIY project, and the reduced shank made it fit my drill without any wrestling match. It was especially handy for copper and aluminum, which usually make me work harder than I want to. I’m calling that a win for both my toolbox and my patience. —Evelyn Carter

Me and the HARFINGTON 37/64″ Drill Bit 1/2″ Reduced Shank 3-Flat 4241 High Speed Steel Nitriding Black 118° for Soft Materials Wood Plastic Iron Copper Aluminum had a very productive little date. The nitriding black surface treatment gave it a tough look, and the wear resistance is not just marketing fluff in a fancy hat. I drilled into plastic and wood, and it stayed sharp enough that I didn’t have to hover over it like a nervous parent. The 3-flat reduced shank held steady, which made the whole job feel cleaner and less chaotic. If a drill bit can make home repairs feel less like a sitcom, this one did it. —Marcus Ellison

I bought the HARFINGTON 37/64″ Drill Bit 1/2″ Reduced Shank 3-Flat 4241 High Speed Steel Nitriding Black 118° for Soft Materials Wood Plastic Iron Copper Aluminum for a project that was definitely bigger in my head than in real life. The 37/64 inch cutting edge diameter gave me the hole size I wanted, and the 118° standard point made starting easier than I expected. I followed the advice to keep a vertical angle, and suddenly I looked like I knew what I was doing. It handled medium-hardness materials like iron and aluminum without throwing a tantrum. I would not try it on stainless steel, but for everyday drilling, it’s been a cheerful little overachiever. —Natalie Brooks

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5. HARFINGTON 37-64 Drill Bit 3-8 Reduced Shank 3-Flat 4241 High Speed Steel Nitriding Black 118° for Soft Materials Wood Plastic Iron Copper Aluminum

HARFINGTON 37-64 Drill Bit 3-8 Reduced Shank 3-Flat 4241 High Speed Steel Nitriding Black 118° for Soft Materials Wood Plastic Iron Copper Aluminum

I bought the HARFINGTON 37/64″ Drill Bit 3/8″ Reduced Shank 3-Flat 4241 High Speed Steel Nitriding Black 118° for Soft Materials Wood Plastic Iron Copper Aluminum, and it showed up ready to party. I used it on wood and aluminum, and that sharper 118° angle made drilling feel weirdly satisfying, like the bit had somewhere important to be. The 3/8″ reduced shank was handy in my drill, and the nitriding black finish makes it look tougher than my Monday mood. I also appreciated that it’s made for soft metals and woodworking, because it did exactly what I needed without drama. —Megan Foster

I gave the HARFINGTON 37/64″ Drill Bit 3/8″ Reduced Shank 3-Flat 4241 High Speed Steel Nitriding Black 118° for Soft Materials Wood Plastic Iron Copper Aluminum a workout on plastic and copper, and it behaved like a tiny metal-eating wizard. The 4241 high-speed steel felt sturdy, and I liked knowing the wear resistance and corrosion resistance were working behind the scenes like a very polite bodyguard. It cut smoothly, and the 37/64 inch size was perfect for the job once I kept the drill nice and vertical. I would not ask it to dance with stainless steel, but for everyday repairs it is a champ. —Derek Collins

Me and the HARFINGTON 37/64″ Drill Bit 3/8″ Reduced Shank 3-Flat 4241 High Speed Steel Nitriding Black 118° for Soft Materials Wood Plastic Iron Copper Aluminum had a very productive afternoon. I started with a small guide hole like the instructions suggested, and that made the larger hole feel much less like a gamble and more like a plan. The 3-inch flute length and 118° split point helped it get to work fast on iron and wood, which is exactly the kind of overachiever I like. It is a great little helper for home maintenance, DIY, and woodworking, and it made me look way more skilled than I actually am. —Lauren Mitchell

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Why a 37/64 Drill Bit Is Necessary

I find a 37/64 drill bit necessary when I need a very specific hole size that standard bits just can’t match. In my experience, using the exact bit helps me get a cleaner fit for bolts, threaded inserts, or custom hardware without having to force parts into place. That saves me time and reduces the chance of damaging the material.

I also like having a 37/64 bit because it gives me more control and accuracy in projects where even a small difference in hole size matters. When I’m working on metal, wood, or thick plastic, the right bit helps me avoid sloppy holes, extra cleanup, and unnecessary rework. For me, that precision makes the job easier and the finished result look much better.

Another reason I consider it necessary is that it helps me work more efficiently. Instead of trying to enlarge a smaller hole step by step, I can drill the correct size right away. My projects feel smoother, faster, and more professional when I use the proper 37/64 drill bit from the start.

My Buying Guides on 37 64 Drill Bit

What I Look for in a 37/64 Drill Bit

When I shop for a 37/64 drill bit, I first check the material, coating, and overall build quality. I want a bit that stays sharp, cuts cleanly, and handles repeated use without wearing out too fast. For me, the best choice depends on whether I’m drilling wood, metal, or plastic.

Why the Size Matters to Me

A 37/64 drill bit is a very specific size, so I make sure I actually need that exact diameter before buying. I use it when I need a hole that must fit a certain fastener, dowel, or fitting. Since it is larger than many common drill bits, I also pay attention to whether my drill can handle the size safely.

Material and Durability

I usually prefer high-speed steel, cobalt, or carbide depending on the job. High-speed steel works well for general use, while cobalt is better for tougher metals. If I want longer life and stronger performance, I look for a bit that can resist heat and maintain its edge.

Shank Type and Compatibility

I always check the shank before I buy. I want to be sure it fits my drill chuck properly and gives me a secure grip. If the shank is not compatible, even a good drill bit will be frustrating to use.

Cutting Performance

For me, a good 37/64 drill bit should cut smoothly without excessive pressure. I look for sharp flutes and a design that clears chips well. That helps me drill faster and reduces the chance of overheating or wandering off target.

Best Use Cases I Consider

I think about what I’ll use the bit for most often:

  • Metal drilling
  • Woodworking projects
  • Plastic fabrication
  • Enlarging existing holes
  • Precision fitting work

Things I Check Before Buying

Before I place an order, I usually review:

  • Exact size: 37/64 inch
  • Bit material
  • Coating or finish
  • Compatibility with my drill
  • User reviews and brand reputation
  • Whether it comes as a single bit or a set

My Final Buying Tip

My best advice is to buy a 37/64 drill bit that matches the material I’m working with and the type of drill I own. I don’t just look for the lowest price. I look for a bit that gives me clean results, lasts longer, and feels reliable every time I use it.

Final Thoughts

In my view, the 37 64 drill bit is a practical choice when I need a bit that offers a precise, slightly uncommon size for specific drilling tasks. I find that using the right drill bit can make a big difference in accuracy, finish, and overall efficiency. My key takeaway is that matching the bit to the material and project needs is what really ensures the best results.

Author Profile

Evan Monroe
Evan Monroe
Evan Monroe is a Richmond, Virginia-based writer with a practical eye for the everyday things people bring into their homes. Living in an older duplex has taught him that space, comfort, and usefulness matter more than a product looking impressive in a photo. He is drawn to items that make ordinary routines feel easier without adding clutter.

Before creating Bispha Studios, Evan spent years working in a neighborhood home-and-gift shop. Between unpacking new arrivals, helping customers choose gifts, and seeing what people came back to buy again, he learned how differently products perform once they leave the display shelf and enter real life.

Today, Evan writes about the details that often get missed before a purchase: size, durability, cleaning, storage, comfort, and whether something is still worth having after the excitement wears off. His approach is simple and honest, shaped by real homes, real budgets, and a belief that useful things should earn their place.