Top 5 Drill Bits For Stainless Steel 2026: Best Guide

The best stainless steel drill bits for 2026 combine cobalt, sharp split points, strong shanks, and heat control.

Drilling stainless steel can turn a simple repair into a slow, noisy job. The bit may skid, heat up, or lose its edge if you use the wrong type. I reviewed five options for different needs, from large reduced-shank bits to a replaceable-tip industrial drill. These picks focus on material, point design, shank size, hole depth, and practical value. Always use cutting oil, steady pressure, and a low speed when drilling stainless steel.

See the differences between my top picks at a glance.

VALYRIANTOOL Cobalt 3-Piece 5/8-Inch Set

The VALYRIANTOOL set is my strongest all-around choice when a stainless steel job needs a large 5/8-inch hole. It uses M35 cobalt high-speed steel, often called cobalt HSS. Cobalt adds heat resistance compared with standard HSS, which matters because stainless steel creates a great deal of heat during cutting. The set includes three bits, so it can suit repeat work or serve as a useful spare supply.

Its 135-degree split point helps the bit start with less walking on flat metal. The reduced 1/2-inch shank also lets the bit fit a chuck that cannot hold a full 5/8-inch shank. I still recommend a pilot hole, cutting oil, and slow speed for the best result. This is a large bit, so use a drill with enough torque and keep the workpiece clamped.

Pros:

• M35 cobalt construction suits heat-prone stainless steel work
• 135-degree split point helps reduce wandering at startup
• 5/8-inch diameter covers a common large-hole requirement
• Reduced shank fits many 1/2-inch drill chucks
• Three-piece quantity gives useful backup for repeated jobs
• Suitable for thicker metal when used with proper feed and oil

Cons:

• A 5/8-inch bit needs a strong drill and careful handling
• Large cobalt bits cost more than basic HSS options
• The set does not provide a range of smaller hole sizes

What Amazon Buyers Are Saying

Buyer feedback should always be checked on the current Amazon listing because ratings and comments can change. The product information clearly appeals to customers who need a large stainless steel hole, a reduced shank, and cobalt construction in one package. The main points to watch in user comments are edge life, shank fit, and whether buyers used enough oil and pressure. Complaints about slow cutting or early dulling may also reflect high speed, light feed pressure, or a loose workpiece rather than the bit alone.

My Recommendation

I recommend this set for serious home workshops, metal repair, and occasional fabrication. It offers the most reassuring material choice in this group for stainless steel, but it still needs correct technique. Buy it when 5/8-inch holes are central to your work and you want spares. My overall rating is 4.5 out of 5.

2-Pack 5/8-Inch Reduced-Shank HSS Bits

This two-pack targets shoppers who need a large hole without buying a premium cobalt set. Each bit measures 5/8 inch and uses a reduced shank. That design allows a smaller chuck to hold a larger cutting diameter. The listing positions these bits for hard metals, stainless steel, and alloy steel, so they fit users who want one size for demanding metal work.

Standard HSS can drill stainless steel, but it needs more care than cobalt HSS. Keep the bit cool with cutting fluid and use a slow drill setting. A two-pack is useful because large bits can suffer if a user overheats the edge or lets the bit rub without cutting. I see this set as a practical choice for maintenance work, brackets, plates, and occasional shop projects.

Pros:

• Two bits provide a useful backup for repeated 5/8-inch holes
• Reduced shank can fit many common 1/2-inch chucks
• Large diameter suits hardware and fabrication tasks
• Designed for hard metals and stainless steel applications
• Usually offers a lower entry cost than cobalt alternatives
• Simple twist-bit shape is familiar to most drill users

Cons:

• Standard HSS has less heat tolerance than M35 cobalt
• Only one hole diameter is included
• Requires careful speed control to prevent rapid edge wear

What Amazon Buyers Are Saying

Check the current listing for verified buyer comments before ordering. The clearest value of this pack is its two-bit format and reduced-shank design. Buyers who need a large hole may appreciate having a spare, while users seeking a broad size range may find the pack limited. When reviewing customer feedback, pay close attention to reports about chuck grip, tip sharpness, and use on thin versus thick stainless steel.

My Recommendation

This pack makes sense for a budget-minded buyer who needs 5/8-inch holes only now and then. It is not my first choice for long production runs or repeated work in thick stainless steel. It can deliver good value when you use low speed, firm pressure, and coolant. My overall rating is 4.1 out of 5.

HeeHoo 20 mm Replaceable-Tip Drill

The HeeHoo drill serves a different purpose from the other four picks. It is a 5xD replaceable-tip drill with a 20 mm diameter and a stated 100 mm drilling depth. Its H13 tool steel body and internal coolant design point toward deeper, more controlled drilling than a basic twist bit. The product also lists a 25 mm shank, so buyers must confirm that their machine accepts this size.

The replaceable tip can reduce waste when the cutting section wears, but it also adds a more industrial setup. This is not the simple bit I would choose for a small cordless drill. It makes more sense for a rigid drill press, machining setup, or production-minded user who values depth and coolant delivery. Follow the seller’s cutting data and confirm the holder, coolant path, and replacement-tip availability before purchase.

Pros:

• Designed for deep holes up to the listed 100 mm drilling depth
• Replaceable tip may reduce the cost of replacing the full body
• Internal coolant design supports heat control in deep cuts
• 20 mm diameter suits large metric holes
• H13 tool steel body is aimed at demanding metal work
• 5xD format offers more depth than a typical short twist bit

Cons:

• 25 mm shank limits compatibility with ordinary handheld drills
• Higher setup demands than a standard HSS twist bit
• Buyers should confirm replacement-tip and coolant-system details
• Overkill for thin sheet metal or occasional household repairs

What Amazon Buyers Are Saying

This newer, specialized product needs careful listing review because long-term customer feedback may be more limited than with common twist bits. The key buying questions concern tip replacement, shank fit, coolant connection, and performance in a rigid machine. I would not treat a lack of complaints as proof of production performance. Instead, compare verified reviews with the seller’s current specifications and contact the seller if your setup has unusual tooling requirements.

My Recommendation

I recommend the HeeHoo only for a machinist or serious metalworker who needs a deep 20 mm hole. Its internal coolant and replaceable-tip format give it the most specialized design here. For a home repair, choose a smaller and simpler bit. For the right machine, this is an impressive option. My overall rating is 4.2 out of 5.

5/8-Inch Reduced-Shank HSS Metal Bit

This single 5/8-inch reduced-shank bit is a straightforward option for users who do not need a multi-piece set. It uses high-speed steel and is listed for hard metals, stainless steel, and alloy steel. The reduced shank keeps the large cutting diameter while making the bit easier to use with many smaller chucks. That balance makes it practical for a one-off repair or a shop that needs one dedicated size.

The key difference from the cobalt pick is the material. HSS can work well, but stainless steel punishes poor technique. Use a firm feed so the edge cuts rather than rubs, and stop often if heat builds up. I also advise marking the depth and securing the metal before drilling. A single bit can be a better value than a set if 5/8 inch is the only size you need.

Pros:

• Single-bit purchase avoids paying for unused sizes
• 5/8-inch cutting diameter handles large fastening holes
• Reduced shank improves compatibility with smaller chucks
• HSS design suits general metal repair and fabrication
• Listed for stainless steel and other hard metal work
• Simple format makes it easy to store and replace

Cons:

• Standard HSS needs more heat control than cobalt HSS
• One bit offers no spare if the cutting edge is damaged
• Large size may be too demanding for a light cordless drill

What Amazon Buyers Are Saying

Review the live Amazon page for current verified buyer experiences. The main practical appeal is clear: one large bit, one reduced shank, and a focus on hard metals. Customer comments are most useful when they explain the drill type, metal thickness, speed, and lubricant used. I would give less weight to reviews that only say a bit was sharp without explaining how it performed after several holes.

My Recommendation

This is a sensible pick for a buyer who needs one 5/8-inch bit at a controlled cost. I would choose the cobalt set for repeated stainless work, but this HSS bit can serve well for occasional drilling. It offers good flexibility if your chuck accepts a 1/2-inch shank. My overall rating is 4.0 out of 5.

20.5 mm HSS 9341 Reduced-Shank Bit

The 20.5 mm HSS 9341 bit is the best fit here for a buyer who works in metric sizes. It uses a 1/2-inch shank and is listed for aluminum, copper, wood, and stainless steel. That material range makes it more versatile than a bit aimed only at one metal. The 20.5 mm diameter is close to 13/16 inch, but it is not the same as a 5/8-inch bit, so measure your fastener and hole requirement first.

The reduced shank helps a standard drill hold this large cutting diameter. Still, the bit needs a stable setup, low speed, and lubricant when cutting stainless steel. Its HSS 9341 construction may suit general workshop use, but I would not expect cobalt-level heat endurance. This is a good choice when metric accuracy matters more than having several inch-size bits.

Pros:

• 20.5 mm size meets a specific metric hole requirement
• 1/2-inch shank fits many common drill chucks
• Listed for stainless steel and several other materials
• Useful for mixed workshop and repair tasks
• Large diameter supports bigger clearance holes
• Single-bit format keeps the purchase focused

Cons:

• Metric size may not suit inch-based hardware
• HSS 9341 is not the same as a cobalt stainless bit
• Large holes require more drill torque and careful alignment

What Amazon Buyers Are Saying

Check the current Amazon review section for verified comments about size accuracy, edge condition, and shank fit. The strongest reason to consider this product is its less common 20.5 mm size. Buyers should compare their actual bolt, bushing, or clearance-hole measurement before ordering. Comments about use in wood or softer metals may not predict performance in stainless steel, so focus on reviews that describe stainless work and the cutting method.

My Recommendation

I recommend this bit for metric fabrication, equipment repair, and mixed-material jobs. It is a practical choice when 20.5 mm is the exact size you need. I would select a cobalt bit for frequent stainless production, but this one offers useful versatility at a likely lower cost. My overall rating is 4.1 out of 5.

How to Choose the Top 5 Drill Bits for Drilling Stainless Steel 2026

Choosing the top 5 drill bits for drilling stainless steel 2026 starts with the hole size and the job setup. Stainless steel can harden when the bit rubs instead of cuts. Heat then rises fast. The right bit helps, but technique matters just as much. The guidance below follows basic metalworking practice: use a sharp bit, slow the speed, apply steady pressure, and use a suitable cutting fluid. Always follow the drill maker’s instructions and wear eye protection.

1. Match the Bit Material to the Heat

Cobalt HSS is the strongest choice in this group for repeated stainless steel work. M35 cobalt HSS contains cobalt within the steel and offers better heat resistance than ordinary HSS. It does not make the bit immune to damage. A cobalt bit can still lose its edge if you run it too fast or allow it to rub.

Standard HSS can work for occasional holes. It often costs less and can handle many workshop materials. However, stainless steel needs a controlled cut. If you only drill one or two holes, HSS may offer good value. If you drill many holes, cobalt usually gives you more margin for error.

The HeeHoo drill uses a different approach. Its replaceable tip and internal coolant design target deeper, more demanding work. That design matters only if your machine can support the shank and coolant setup. Do not buy an industrial-style drill for a small hand drill without checking every connection and size.

2. Check Point Shape, Shank Size, and Hole Depth

A split point helps a bit start on flat metal with less walking. The VALYRIANTOOL bit lists a 135-degree split point, which is useful for a large hole. A center punch can also create a small starting mark. For very large holes, drill a pilot hole first. The pilot hole reduces the cutting load and makes it easier to keep the final bit centered.

Shank size matters more than many buyers expect. A 5/8-inch cutting diameter may use a 1/2-inch reduced shank. That lets a 1/2-inch chuck hold the bit. The HeeHoo model lists a 25 mm shank, which calls for a larger and more specialized tool. Confirm the chuck capacity before you order.

Next, measure the required depth. A short twist bit may work for a thin plate. A 5xD drill suits deeper holes, but deep drilling creates more heat and makes chip removal harder. Withdraw the bit as needed to clear chips. Never force a deep bit through packed chips.

3. Compare the Full Cost of the Job

Price alone does not show value. A two-pack can make sense if you need a spare. A single reduced-shank HSS bit may be better if you need one exact size. A cobalt set costs more, but its heat resistance may help during repeated stainless work. A replaceable-tip drill may lower future body replacement costs, yet its holder and machine needs can raise the total investment.

Also check whether the product includes the size you need. A 5/8-inch bit does not replace a 20.5 mm bit. The difference can matter when a bolt, bushing, or pass-through hole has a strict measurement. Use a caliper when possible. Do not rely on a product name alone.

Finally, plan for cutting oil, clamps, and safe work support. A good bit cannot correct a loose workpiece. Secure the metal, keep your hands away from the cutting path, and let the tool do the work. The best top 5 drill bits for drilling stainless steel 2026 will perform better when you use the right speed and feed.

Final Verdict: Which Should You Buy?

For most stainless steel users, I would buy the VALYRIANTOOL M35 cobalt set. Its 135-degree split point, reduced shank, and three-bit format make it the best overall pick.

The top 5 drill bits for drilling stainless steel 2026 also include strong budget, metric, and deep-hole choices. Match the bit to your chuck, hole size, and work volume.

FAQs Of top 5 drill bits for drilling stainless steel 2026

What type of drill bit is best for stainless steel?

Cobalt HSS is usually the best choice for repeated stainless steel drilling. It handles heat better than basic HSS. Use low speed, steady pressure, and cutting oil.

Can I use a regular HSS bit on stainless steel?

Yes, a regular HSS bit can drill stainless steel for occasional work. Keep the speed low and prevent rubbing. Cobalt HSS is better for frequent or deep holes.

Why do drill bits get hot when drilling stainless steel?

Stainless steel creates heat when the bit cuts or rubs against it. High speed, light pressure, and a dull edge make the problem worse. Cutting fluid and proper feed help control heat.

Do I need a reduced-shank drill bit for a 5/8-inch hole?

You need one if your drill chuck cannot accept a full 5/8-inch shank. A reduced shank keeps the larger cutting diameter while using a smaller chuck size. Check the stated shank measurement before buying.

Should I drill a pilot hole in stainless steel?

A pilot hole is helpful for large holes. It reduces the load on the final bit and improves starting control. Clamp the workpiece and clear chips during the cut.