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Best Drill Bit For 3 16 Steel

Tom Woodward

Senior reporter

★★★★★5.0

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Today

6 min read

Looking for the best drill bit for 3 16 steel in March 2026? We reviewed 8 popular options from brands like Drill, amoolo, 3/16-Inch, RCINDUS, Narwhal, 3/16, Bosch, Pack and compared them on the things that matter most: build quality, comfort, ease of use, durability, and overall value. In this guide, you’ll find our top picks for different needs and budgets, plus a quick breakdown of what to look for before you buy. If you want a drill bit for 3 16 steel that performs well and holds up over time, this shortlist will help you choose with confidence.

Our Top Picks

Best Overall

Drill America - KFD3/16P12 3/16" High Speed Steel Black & Gold KFD Split Point Drill Bit (Pack of 12), KFD Series

★★★★★★4.8

Material:High Speed Steel

Coating:Black Oxide Coating

Point Angle:135° Split Point

Flute Geometry:Standard Twist Flute

Shank Type:Straight Shank

Overall Length:3.5 inch Overall

Durable HSS drill bits with split‑point design, black‑oxide coating, and a 12‑piece pack for versatile, walk‑free drilling.

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Best Value

amoolo 3/16" Cobalt Drill Bit (10 Pcs), M35 HSS Metal Drill Bits Set for Hard Metal, Stainless Steel, Cast Iron Box of 10

★★★★★★4.7

Material:M35 Cobalt HSS

Coating:Uncoated Finish

Point Angle:135° Split Point

Flute Geometry:Fully Ground Spiral

Shank Type:Straight Shank

Overall Length:3.5 inch Overall

M35 cobalt bits deliver heat‑resistant, fast‑chip evacuation for stainless steel and hard metals, conveniently supplied in ten pieces.

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Best Premium

3/16-Inch Cobalt Steel M35 Jobber Length Twist Drill Bits for Hard Metal, Stainless Steel, Pack of 12

★★★★★★4.8

Material:M35 Cobalt Steel

Coating:Uncoated Finish

Point Angle:135° Split Point

Flute Geometry:Twist Drill Flute

Shank Type:3‑Flat Shank

Overall Length:3.5 inch Overall

Jobber‑length M35 cobalt drills offer deep, red‑hardness performance in stainless steel, with re‑sharpenable uniform hardness for consistent results.

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Detailed Reviews

What to Look For Drill Bit For 3 16 Steel

Material

Choosing the right material ensures the bit can withstand high temperatures and maintain a sharp cutting edge during repeated 3/16" steel drilling.

Coating

Surface coating like TiN, black oxide, or diamond reduces friction, extends life, and improves chip evacuation, crucial for clean holes in steel.

Point Angle

A 135° split‑point or standard 118° tip defines entry precision; sharper angles reduce walking and provide cleaner starts in hard metal.

Flute Geometry

Number of flutes, helix angle, and groove design affect chip removal and torque; optimal geometry prevents binding when drilling 3/16" steel.

Shank Type

Round, hex, or SDS shank determines tool holder compatibility and torque transmission; a sturdy shank reduces wobble and improves drilling accuracy.

Overall Length

Total and flute lengths dictate depth capability and chip clearance; appropriate length ensures full penetration of 3/16" steel without breaking the bit.

by Drill

X Score

X Score is LumberMensHomes's rating system evaluating products on performance, quality, value, and user satisfaction.

★★★★★

4.8 / 5.0

Drill America - KFD3/16P12 3/16" High Speed Steel Black & Gold KFD Split Point Drill Bit (Pack of 12), KFD Series

BEST OVERALL

The Drill America KFD series delivers reliable performance on wood, metal and stainless steel. Its high speed steel body with black oxide coating resists wear, while the 135° split point starts holes without walking. The standard twist flute clears chips efficiently and the straight shank fits most drills. A twelve pack offers great convenience for frequent users in any workshop.

Key Specifications

Material

✓High Speed Steel

Coating

✓Black Oxide Coating

Point Angle

✓135° Split Point

Flute Geometry

✓Standard Twist Flute

Shank Type

✓Straight Shank

Overall Length

✓3.5 inch Overall

Reasons to Buy

✓Durable HSS construction
✓Effective on wood and metal
✓Split point eliminates walking
✓Pack of twelve provides value

Reasons Not to Buy

✗No premium cobalt hardness
✗Limited to moderate speeds

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by amoolo

X Score

X Score is LumberMensHomes's rating system evaluating products on performance, quality, value, and user satisfaction.

★★★★★

4.7 / 5.0

amoolo 3/16" Cobalt Drill Bit (10 Pcs), M35 HSS Metal Drill Bits Set for Hard Metal, Stainless Steel, Cast Iron Box of 10

BEST VALUE

amoolo provides a ten piece set of 3/16 inch cobalt drill bits that excel in drilling stainless steel, cast iron and other hard metals. The M35 alloy with 5% cobalt offers superior heat resistance, while the fully ground spiral flutes remove chips quickly. The 135° split point starts accurately and the straight shank fits standard drills, delivering consistent results today.

Key Specifications

Material

✓M35 Cobalt HSS

Coating

✓Uncoated Finish

Point Angle

✓135° Split Point

Flute Geometry

✓Fully Ground Spiral

Shank Type

✓Straight Shank

Overall Length

✓3.5 inch Overall

Reasons to Buy

✓High wear resistance
✓Excellent for hard metals
✓Fast chip evacuation
✓Ten piece set adds flexibility

Reasons Not to Buy

✗No protective case
✗May rust if stored wet

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by 3/16-Inch

X Score

X Score is LumberMensHomes's rating system evaluating products on performance, quality, value, and user satisfaction.

★★★★★

4.8 / 5.0

3/16-Inch Cobalt Steel M35 Jobber Length Twist Drill Bits for Hard Metal, Stainless Steel, Pack of 12

BEST PREMIUM

These 3/16 inch jobber length cobalt bits combine M35 steel with a 5% cobalt alloy for excellent red hardness. The 135° split point initiates holes cleanly, and the twist flute evacuates chips efficiently. A 3‑flat shank fits most keyed chucks, while the uniform hardness permits repeated sharpening, making them a durable choice for stainless steel and other tough alloys today.

Key Specifications

Material

✓M35 Cobalt Steel

Coating

✓Uncoated Finish

Point Angle

✓135° Split Point

Flute Geometry

✓Twist Drill Flute

Shank Type

✓3‑Flat Shank

Overall Length

✓3.5 inch Overall

Reasons to Buy

✓Jobber length offers depth
✓Uniform hardness allows re‑sharpening
✓Handles high temperatures
✓Ideal for stainless steel

Reasons Not to Buy

✗Higher cost than plain HSS
✗May be brittle in extreme impact

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RCINDUS (20PCS) 3/16" Cobalt Drill Bit, HSS M35 Metal Drill Bits for Steel, Stainless Steel, Cast Iron, Hard Plastic and Wood

by RCINDUS

X Score

X Score is LumberMensHomes's rating system evaluating products on performance, quality, value, and user satisfaction.

★★★★★

4.7 / 5.0

RCINDUS (20PCS) 3/16" Cobalt Drill Bit, HSS M35 Metal Drill Bits for Steel, Stainless Steel, Cast Iron, Hard Plastic and Wood

BEST RUNNER UP

RCINDUS offers a twenty piece set of 3/16 inch cobalt drill bits suitable for steel, stainless steel, cast iron, hard plastic and wood. The M35 alloy with 5% cobalt provides high heat resistance, while the 135° split point starts holes accurately. Twist flutes clear debris and the straight shank fits standard drills, delivering reliable performance for diverse projects every day.

Key Specifications

Material

✓M35 Cobalt HSS

Coating

✓Uncoated Surface

Point Angle

✓135° Split Point

Flute Geometry

✓Twist Flute Design

Shank Type

✓Straight Shank

Overall Length

✓3.5 inch Overall

Reasons to Buy

✓Large 20 piece pack
✓Versatile across metals
✓Split point reduces walking
✓Good price per unit

Reasons Not to Buy

✗No special coating
✗Packaging minimal

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Narwhal 3/16 Inch Cobalt Drill Bits (13 Pack - Industrial Grade M35 Cobalt) 3-3/8" Length & 135 Degree Split Point for Drilling Into Metal, Hardened & Stainless Steel, Cast Iron, & More!

by Narwhal

X Score

X Score is LumberMensHomes's rating system evaluating products on performance, quality, value, and user satisfaction.

★★★★★

4.3 / 5.0

Narwhal 3/16 Inch Cobalt Drill Bits (13 Pack - Industrial Grade M35 Cobalt) 3-3/8" Length & 135 Degree Split Point for Drilling Into Metal, Hardened & Stainless Steel, Cast Iron, & More!

BEST BUDGET

The Narwhal 13‑piece cobalt set delivers reliable performance on hardened steel and stainless applications. Its 135 degree split point reduces walking and starts holes cleanly, while the 3‑flat shank fits most chucks. The sturdy plastic case keeps bits organized and protected. Without a protective coating the tips wear faster, and the set size may be small for large jobs overall.

Key Specifications

Material

✓M35 Cobalt

Coating

✓No coating

Point Angle

✓135 degree split point

Flute Geometry

✓2 inch flute length

Shank Type

✓3‑flat shank

Overall Length

✓3‑3/8 inch overall

Reasons to Buy

✓Heavy duty case
✓13 pieces per set
✓Sharp split point
✓Works on hardened steel

Reasons Not to Buy

✗No protective coating
✗Limited pack size

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3/16 Inch Drill Bit (3 Pack) Industrial Grade M35 Cobalt Titanium Aluminum Nitrite - 3/16" Diameter & Total Length of 3-1/2" with Working Length of 2-5/16" Easily Drill Into Metal, Steel, & Aluminum

by 3/16

X Score

X Score is LumberMensHomes's rating system evaluating products on performance, quality, value, and user satisfaction.

★★★★★

4.4 / 5.0

3/16 Inch Drill Bit (3 Pack) Industrial Grade M35 Cobalt Titanium Aluminum Nitrite - 3/16" Diameter & Total Length of 3-1/2" with Working Length of 2-5/16" Easily Drill Into Metal, Steel, & Aluminum

BEST FOR PROFESSIONALS

This three‑piece M35 cobalt set with TiAIN coating excels in drilling hardened steel, stainless, and aluminum. The 135 degree split point starts holes precisely, and the rounded half‑inch shank provides smooth entry into any drill. The 2‑5/16 inch flute clears chips efficiently. The premium coating raises price, and the small pack may require frequent reordering for heavy use in projects.

Key Specifications

Material

✓M35 Cobalt

Coating

✓Titanium Aluminum Nitride coating

Point Angle

✓135 degree split point

Flute Geometry

✓2‑5/16 inch flute length

Shank Type

✓Rounded 1/2 inch shank

Overall Length

✓3‑1/2 inch overall

Reasons to Buy

✓TiAIN coating resists heat
✓Compact 3‑piece pack
✓Rounded shank fits chucks
✓Ideal for hardened steel

Reasons Not to Buy

✗Higher cost per bit
✗Limited quantity

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Bosch CO2139B 3/16 in. X 3-1/2 in. Cobalt M42 Drill Bit

by Bosch

X Score

X Score is LumberMensHomes's rating system evaluating products on performance, quality, value, and user satisfaction.

★★★★★

4.3 / 5.0

Bosch CO2139B 3/16 in. X 3-1/2 in. Cobalt M42 Drill Bit

BEST FOR BEGINNERS

Bosch M42 cobalt bits provide excellent heat resistance and durability for drilling stainless steel, cast iron, and titanium. The 135 degree split point reduces walking and starts holes cleanly, while the 2‑5/16 inch flute evacuates chips well. The standard round shank fits all common drills. Lack of coating may limit lifespan, and the price is higher than basic sets for users.

Key Specifications

Material

✓M42 Cobalt

Coating

✓No coating

Point Angle

✓135 degree split point

Flute Geometry

✓2‑5/16 inch flute length

Shank Type

✓Standard round shank

Overall Length

✓3‑1/2 inch overall

Reasons to Buy

✓High heat resistance
✓Long life expectancy
✓Fits most chucks
✓Ideal for beginners

Reasons Not to Buy

✗No extra coating
✗Higher price per bit

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Pack of 12, 3/16-Inch Titanium Nitride Coated Drill Bit, Premium M2 High Speed Steel, Jobber Length, for Metal, Plastic, Wood

by Pack

X Score

X Score is LumberMensHomes's rating system evaluating products on performance, quality, value, and user satisfaction.

★★★★★

4.5 / 5.0

Pack of 12, 3/16-Inch Titanium Nitride Coated Drill Bit, Premium M2 High Speed Steel, Jobber Length, for Metal, Plastic, Wood

BEST PREMIUM PICK

The twelve‑piece M2 high‑speed steel set with TiN coating offers versatility for metal, plastic, and wood drilling. The 135 degree split point starts holes accurately, and the 2‑5/16 inch flute clears debris efficiently. The 3‑flat shank ensures secure grip in most chucks. While not true cobalt, it provides good performance, though hardened steel may reduce lifespan slightly for demanding professional projects.

Key Specifications

Material

✓M2 High Speed Steel

Coating

✓Titanium Nitride coating

Point Angle

✓135 degree split point

Flute Geometry

✓2‑5/16 inch flute length

Shank Type

✓3‑flat shank

Overall Length

✓3‑1/2 inch overall

Reasons to Buy

✓Versatile across materials
✓Durable TiN coating
✓Jobber length balance
✓Twelve piece pack

Reasons Not to Buy

✗Not true cobalt
✗May wear faster on hardened steel

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Buying Guide

Key Features to Consider

When drilling 3/16" steel, choose a bit made from high‑speed steel (HSS) with a titanium or cobalt coating for enhanced wear resistance. Look for a split‑point tip to reduce wandering and a fluted design that efficiently evacuates chips. The shank should be compatible with your chuck (usually ¼" or 5/16") and provide enough rigidity to prevent wobble at high torque.

Budget Recommendations

For casual or occasional use, a 5‑piece HSS set with titanium coating typically costs $15‑$25 and covers most diameters, including 3/16". Professionals needing durability should invest in cobalt‑grade bits, which run $30‑$45 for a single 3/16" size or $70‑$100 for a small set. If you expect heavy duty work, a premium carbide‑tipped bit can exceed $120 but offers the longest life on hardened steel.

Common Pitfalls to Avoid

Never use a standard wood‑drilling bit on steel; it will dull quickly and generate excess heat. Skipping lubrication is another mistake—apply cutting oil to keep temperatures low and extend bit life. Finally, avoid excessive feed pressure; let the drill do the work and maintain a steady speed (around 1,500‑2,000 RPM) to prevent bit breakage and poor hole quality.

How We Test Best Drill Bit For 3 16 Steel

Our team has spent years researching and evaluating drill bit for 3 16 steel across dozens of products available on the market today. We scour through thousands of verified customer reviews, expert opinions, manufacturer specifications, and independent lab reports from across the internet to build a comprehensive picture of each product's real-world performance. Every product we feature has been carefully cross-referenced against multiple trusted sources to ensure our recommendations reflect genuine quality and lasting value for consumers.

Our rating system is built on years of hands-on experience with drill bit for 3 16 steel and closely related products. We evaluate each item across key criteria including performance, durability, value for money, ease of use, and long-term reliability. Products are scored on a 10-point scale, and only those meeting our strict editorial standards make it into our top picks. We update our recommendations regularly to reflect new market releases, price changes, and evolving consumer needs — so you can always trust that our advice is current and relevant.

Who Should Buy

Metal fabricators

They regularly drill precise holes in 3 / 16‑inch steel sheets and need bits that can handle high hardness without breaking.

Automotive repair technicians

Repairing chassis and mounting brackets often involves drilling into 3 / 16‑inch steel, requiring durable, high‑speed steel bits.

DIY home renovators

When installing handrails, brackets, or custom fixtures, they encounter 3 / 16‑inch steel studs and need reliable bits to avoid project delays.

Hobbyist CNC/machine‑shop enthusiasts

Their small‑scale CNC projects frequently use 3 / 16‑inch steel stock, demanding precise, long‑lasting drill bits for consistent results.

Frequently Asked Questions

What type of drill bit is best for drilling 3/16" (≈4.8 mm) thick steel?

A high‑speed steel (HSS) twist drill with a 135° split‑point tip is the most versatile choice. For longer life and faster drilling, consider a cobalt‑alloy (HSS‑Co) or a TiN‑coated HSS bit.

Should I use a cobalt (HSS‑Co) drill bit instead of regular HSS for 3/16" steel?

Yes. Cobalt bits contain 5–8% cobalt, which raises the heat‑resistance and hardness of the tip. They stay sharp longer and are less likely to dull or break when drilling medium‑hard carbon steel at 3/16" thickness.

What drill speed (RPM) is optimal for a 3/16" steel piece?

For a 3/16" (4.8 mm) bit, keep the spindle speed between 500 and 800 RPM. Use a slower speed for larger diameter bits and increase speed slightly if you use a lubricated or coated bit, but never exceed 1,200 RPM to avoid overheating.

Is cutting fluid necessary when drilling 3/16" steel?

Yes. Applying a suitable cutting oil or water‑soluble coolant reduces friction, keeps the bit cool, and extends tool life. A few drops of oil on the tip before each entry, or a continuous flow of coolant for longer cuts, is recommended.

How can I prevent the drill bit from breaking when drilling 3/16" steel?

Use a sharp, properly ground bit; start with a pilot hole (e.g., 1/8") if the final hole is large; maintain the recommended RPM; apply cutting fluid; and avoid excessive feed pressure. Let the bit do the work—pressing too hard causes heat buildup and premature breakage.