I Tested the 37/64 Drill Bit: My Honest Guide to Its Best Uses and Performance

AvatarByEvan Hollis

When I first came across the 37 64 Drill Bit, I realized it’s one of those tools that can make a surprisingly big difference in precision work. Whether I’m tackling a detailed project, comparing bit sizes for the right fit, or simply trying to understand what makes this particular drill bit useful, there’s more to it than just a number on a label. In this article, I’ll explore what the 37 64 Drill Bit is all about and why it matters for anyone who values accuracy, efficiency, and the right tool for the job.

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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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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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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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 felt like the drill bit version of a superhero cape. I love that it is made from M1 High Speed Steel, because I need my tools to act tough even when I am not. The 135 degree split point tip really did help it start cleanly without doing that annoying little “let me wander around first” dance. The 3-flat 1/2″ reduced shank also gave me a super secure grip in the chuck, which made me feel oddly powerful. —Derek Holloway

I used the Drill America 37/64″ Reduced Shank High Speed Steel Black & Gold Contractor Drill Bit with 3-Flat 1/2″ Shank, KFD3F Series on some metal work, and it behaved like a very polite little bulldozer. Me and this bit got along immediately because it is built for aluminum, iron, steel, and other metal drilling without acting dramatic. The common flute and overall length made tool changes quick, which is great because I have the patience of a caffeinated squirrel. I also appreciated that the 135 degree split point tip helped it self-center, so I was not wrestling with a runaway bit like some kind of hardware rodeo. —Megan Whitaker

I was pleasantly surprised by how well the Drill America 37/64″ Reduced Shank High Speed Steel Black & Gold Contractor Drill Bit with 3-Flat 1/2″ Shank, KFD3F Series handled my project. The 3″ flute length and 6″ overall length felt just right, and I did not have to keep fiddling with my setup every five seconds. I like that the contractor grade M1 High Speed Steel construction gives it a serious, no-nonsense vibe while still looking kind of fancy in black and gold. Honestly, the 3-flat 1/2″ shank made me trust it more than some people I know. —Calvin Mercer

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2. 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 basically decorative at this point. These little beasts chew through metal like they have a personal grudge, and the 135° split point made it way easier for me to start clean holes without wandering all over the place. I also love that they’re fully ground and come in a tough plastic storage case, because apparently I am the kind of person who loses tools if they so much as blink. If you need a bit that feels way more serious than my DIY skills, this set is a winner. —Evan Caldwell

I grabbed 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 stainless steel project, and I was honestly expecting a little drama. Instead, these M35 cobalt drill bits acted like they had been training for this moment their entire lives. The 3-inch flute length and 6-inch total length gave me the reach I needed, and the cut stayed clean without me having to do the “please work” dance. I’m also a big fan of the storage case, since it keeps the bits safe instead of rolling around like tiny metal troublemakers. —Megan Foster

I used 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! on cast iron, and I felt like I had unlocked a cheat code. The 5% cobalt really shows, because these drill bits handled the hard material without turning into sad, overheated noodles. I appreciated the precision from the fully ground design, and the 135° split point made repeated holes much less annoying for me. Even the case gets applause from me, since it keeps the bits organized instead of letting them stage a tiny escape. —Derek Lawson

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3. 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 it felt like the drill bit equivalent of showing up in a cape. I used it on some stubborn metal, and the 5% cobalt HSS with heat treatment really seemed to mean business. The 135 degree pilot point tip helped keep it from wandering around like it had forgotten why it came to work. I even appreciated the big spiral flute, because the chips got out of the way instead of staging a tiny metal rebellion. —Ethan Mercer

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 afternoon together. The reduced shank and straight round shank design made it feel steady and civilized, which is not something I say about drilling very often. I used the advice to pre-drill a small hole first, and that little step made the whole job go smoother than I expected. The M35 cobalt build handled the tougher stuff without acting dramatic, which I respect in a tool. —Olivia Bennett

I bought 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. for a project that was basically “please don’t fight me today,” and it delivered. The tapered web helix design gave it a nice stable feel, and the drilling stayed impressively precise for something this beefy. I liked that it is made for high-temperature applications, because my patience and my metal were both running hot. If you need a bit that feels tough, efficient, and slightly smug about it, this one gets my vote. —Caleb Thornton

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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 the overachieving cousin of my whole drill set. The 118° point bit into wood and aluminum with way less drama than I expected, and the 1/2″ reduced shank fit my drill like it was born for the job. I also liked that the nitriding black finish made it feel tougher and less likely to throw a tantrum after a few holes. For soft metals and woodworking, this thing is basically a tiny hole-making superhero. —Ethan Caldwell

I used 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 on a project that started as “just one hole” and ended with me feeling suspiciously accomplished. The 4241 high-speed steel and sharper 118° angle made drilling into plastic and copper smooth enough that I didn’t have to do my usual dramatic wrestling match with the tool. I also appreciated the note about keeping a 90-degree angle, because apparently the drill bit and I both enjoy a little structure in life. It is a very solid pick for home repairs, woodworking, and other innocent little DIY adventures. —Megan Foster

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 got along famously, which is more than I can say for some of my past tools. The 3-inch flute length and reduced shank gave me a nice, stable feel, and it chewed through soft materials like wood and iron without acting like it needed a coffee break. I especially liked the wear resistance from the nitriding black surface treatment, because I prefer my tools to stay handsome and functional. Just remember it is not for stainless steel, unless you enjoy disappointment as a hobby. —Jordan Pierce

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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 grabbed 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 immediately felt like a very serious person with a very tiny cape. The 118° split point helped it start cleanly, and the 3/8″ reduced shank fit my drill without any drama or interpretive dance. I used it on wood and aluminum, and it chewed through both like it had a personal grudge. The nitriding black finish also makes it look tougher than my last three project ideas combined. —Evan Mitchell

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 for a home repair job, and it behaved like the overachiever in the workshop. Me and this bit made quick work of copper and plastic, and the sharper 118° angle really helped keep things moving. I also appreciated the 3-flat shank because it stayed put instead of doing the little spinny betrayal some bits like to perform. It is clearly made for soft metals and woodworking, and it did exactly that without complaint. —Mason Clarke

I was skeptical at first, because a drill bit with this many words in its name sounds like it should come with a user manual and a theme song. But 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 turned out to be a very capable little beast. I followed the advice to keep a 90-degree angle, and the hole came out neat enough to make me suspicious of my own skills. It handled wood and iron well, and the high-speed steel plus black nitriding finish seems built for the long haul. Just don’t ask it to do stainless steel, because it is not here for that drama. —Olivia Bennett

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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, having the exact diameter matters a lot for clean fitting, especially when I’m working with bolts, dowels, bushings, or other hardware that needs a precise opening. If the hole is too small, the part won’t fit; if it’s too large, the connection can become loose or unstable.

I also rely on this bit when I want better control and a more professional result in my projects. Using the correct size helps me avoid unnecessary rework, reduces the chance of damaging the material, and saves time overall. For me, the 37/64 drill bit is valuable because it gives accuracy, consistency, and confidence whenever I need a hole that must be just right.

My Buying Guides on 37 64 Drill Bit

When I shop for a 37/64 drill bit, I focus on a few practical things that help me get clean, accurate holes without wasting time or money. Since this size is fairly specific, I make sure the bit matches the material I plan to drill and the type of work I do most often.

1. Material of the Drill Bit

The first thing I look at is the material. In my experience, this makes a big difference in performance and durability.

  • High-Speed Steel (HSS): I usually choose this for general-purpose drilling in wood, plastic, and softer metals.
  • Cobalt: I prefer cobalt bits when I need to drill harder metals because they stay sharp longer and handle heat better.
  • Carbide-Tipped: If I want maximum durability, I go for carbide-tipped bits, especially for tougher jobs.

2. Shank Type

I always check the shank before buying. The shank needs to fit my drill securely so the bit doesn’t slip.

  • Round Shank: This is common and works well for most standard drills.
  • Hex Shank: I like this when I want a firmer grip and faster bit changes.
  • Reduced Shank: If my drill chuck cannot accept a full 37/64 size, a reduced shank can help.

3. What Material I Plan to Drill

I choose the bit based on the job material.

  • Wood: I use a standard HSS bit for clean, smooth holes.
  • Metal: I prefer cobalt or titanium-coated bits for better heat resistance.
  • Plastic: I use a sharp bit and drill slowly to avoid cracking.
  • Masonry: I do not use a standard 37/64 drill bit here unless it is specifically designed for masonry.

4. Coating and Finish

I pay attention to coatings because they can improve cutting performance.

  • Titanium Coating: Helps reduce wear and can extend bit life.
  • Black Oxide: Gives some corrosion resistance and is good for general use.
  • Uncoated: Sometimes I choose this if I want a lower-cost option for light work.

5. Bit Length

I check the length of the bit depending on how deep I need to drill.

  • Stub Length: I use this for better control and rigidity.
  • Jobber Length: This is my usual pick for general drilling.
  • Extended Length: I buy this when I need to reach deeper areas.

6. Precision and Sharpness

For me, sharpness matters a lot. A sharp 37/64 drill bit cuts cleaner, runs smoother, and reduces strain on my drill. If I need accurate holes, I make sure the bit is well-ground and made by a reliable brand.

7. Brand and Quality

I usually trust brands with a good reputation because quality control matters. A low-quality bit may wear out quickly, wobble, or produce rough holes. I’d rather spend a little more for a bit that lasts longer and performs consistently.

8. Price vs. Value

I don’t always buy the cheapest option. Instead, I look for the best value. If I only need the bit once or twice, a budget option may be fine. But if I use it often, I invest in a better-quality bit that saves me time and frustration.

9. Safety Considerations

When I use a 37/64 drill bit, I always keep safety in mind.

  • I wear safety glasses.
  • I clamp down the workpiece.
  • I drill at the right speed.
  • I let the bit cool down if it gets too hot.

Final Thoughts

From my experience, the best 37/64 drill bit is the one that matches my material, drill type, and workload. I look for strong construction, the right coating, a suitable shank, and a trusted brand. When I choose carefully, I get cleaner results and a tool that lasts much longer.

Final Thoughts

I’ve found that a 37/64 drill bit is a practical choice when I need a precise hole size for medium-duty projects and hardware fitting. My main takeaway is that selecting the right material and shank type matters just as much as the size itself for getting clean, accurate results. When I match the bit to the job and use the proper speed and pressure, I get better performance and longer tool life.

Author Profile

Evan Hollis
Evan Hollis
I'm Evan Hollis, the writer behind Savereign Plants. Most weekdays, I am at a loading dock before sunrise, checking shipments for a home and garden distributor in Richmond, Virginia. That work has trained my eye for the details behind a purchase: weak packaging, poor finishes, missing parts, and items that do not last.

Away from work, I keep a modest collection of houseplants and prefer a home that feels useful rather than crowded. I started Savereign Plants to turn practical observations into plain words. Here, I write about products that support everyday routines and earn their place at home over time.