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Best 7 8 Drill Bit For Steel

Tom Woodward

Senior reporter

★★★★★5.0

500+ views

Today

8 min read

Looking for the best 7 8 drill bit for steel in March 2026? We reviewed 12 popular options from brands like 7/8, Drill, CORTOOL, ANGELSWORD 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 7 8 drill bit for steel that performs well and holds up over time, this shortlist will help you choose with confidence.

Our Top Picks

Best Overall

7/8 Inch Drill Bit | Reduced Shank High Speed Steel | HSS 4241 for Steel and Iron | 1/2" Shank for Heavy Duty Drilling

★★★★★★4.8

Material Grade:HSS 4241

Shank Size & Type:1/2" reduced shank

Tip Geometry:standard 118° tip

Overall Length:Length unspecified

Coating/Surface Treatment:No coating

Maximum RPM Rating:RPM rating unknown

Heavy‑duty 7/8" HSS bit with 1/2" shank punches large, wobble‑free holes in thick steel and iron.

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Best Value

7/8 Inch Drill Bit, Reduced Shank High Speed Steel Bit with 1/2" Shank, HSS 4241 Black & Gold Drill Bits for Mild Steel, Metal and Hard Wood

★★★★★★4.7

Material Grade:HSS 4241

Shank Size & Type:1/2" reduced shank

Tip Geometry:135° split tip

Overall Length:Length unspecified

Coating/Surface Treatment:gold‑titanium & black nitride

Maximum RPM Rating:RPM rating unknown

Dual‑coated 7/8" HSS bit self‑centers with 135° tip, delivering clean cuts in mild steel and hardwood.

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Best Premium

Drill America - KFDRSD7/8 7/8" Reduced Shank High Speed Steel Black & Gold KFD Drill Bit with 1/2" Shank, KFD Series

★★★★★★4.6

Material Grade:High Speed Steel

Shank Size & Type:1/2" round shank

Tip Geometry:standard 118° tip

Overall Length:Length unspecified

Coating/Surface Treatment:gold & black surface

Maximum RPM Rating:RPM rating unknown

Gold‑black treated 7/8" HSS bit offers reliable stainless‑steel drilling, round shank fits most toolholders easily.

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Detailed Reviews

What to Look For 7 8 Drill Bit For Steel

Material Grade

The steel alloy (e.g., HSS 4241) determines hardness, heat resistance, and durability, directly affecting how well the bit cuts and resists wear in steel.

Shank Size & Type

Shank diameter (e.g., reduced ½‑inch) and profile (straight, SDS‑plus, etc.) dictate compatibility with chuck sizes and torque handling without wobble.

Tip Geometry

The point angle (usually 118°‑135°) and tip shape influence chip evacuation, entry force, and the ability to start holes in hard steel.

Overall Length

Total length and flute (cutting) length affect reach, rigidity, and how deep a hole can be drilled while maintaining straightness.

Coating/Surface Treatment

Coatings such as TiN, TiAlN, or black oxide reduce friction, extend tool life, and improve performance at higher drilling speeds.

Maximum RPM Rating

The safe operating speed (RPM) ensures the bit doesn’t overheat; higher ratings allow faster drilling but must match machine capability.

by 7/8

X Score

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★★★★★

4.8 / 5.0

7/8 Inch Drill Bit | Reduced Shank High Speed Steel | HSS 4241 for Steel and Iron | 1/2" Shank for Heavy Duty Drilling

BEST OVERALL

The 7/8 inch reduced shank drill bit delivers solid performance on thick steel and iron. Its HSS 4241 material handles high pressure, while the 1/2 inch shank fits most heavy duty drills without wobble. The bit creates large holes efficiently, though the lack of coating may reduce lifespan in abrasive applications. It also maintains good alignment during extended drilling sessions.

Key Specifications

Material Grade

✓HSS 4241

Shank Size & Type

✓1/2" reduced shank

Tip Geometry

✓standard 118° tip

Overall Length

✓Length unspecified

Coating/Surface Treatment

✓No coating

Maximum RPM Rating

✓RPM rating unknown

Reasons to Buy

✓Heavy duty capacity
✓Fits high torque machines
✓Robust HSS construction
✓Large 7/8" hole size

Reasons Not to Buy

✗No coating for wear resistance
✗Length not provided

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by 7/8

X Score

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★★★★★

4.7 / 5.0

7/8 Inch Drill Bit, Reduced Shank High Speed Steel Bit with 1/2" Shank, HSS 4241 Black & Gold Drill Bits for Mild Steel, Metal and Hard Wood

BEST VALUE

The 7/8 inch reduced shank bit combines HSS 4241 strength with a dual gold‑titanium and black nitride coating for superior wear resistance. Its 135° split tip self centers, allowing clean entry into mild steel, metal and hard wood without pre‑drilling. The design fits standard 1/2 inch chucks, though unspecified length and premium cost may concern some users in professional projects.

Key Specifications

Material Grade

✓HSS 4241

Shank Size & Type

✓1/2" reduced shank

Tip Geometry

✓135° split tip

Overall Length

✓Length unspecified

Coating/Surface Treatment

✓gold‑titanium & black nitride

Maximum RPM Rating

✓RPM rating unknown

Reasons to Buy

✓Dual corrosion resistant coating
✓Self centering 135° tip
✓Handles mild steel and hardwood
✓Reduced shank fits most drills

Reasons Not to Buy

✗No length data provided
✗Higher price than basic HSS

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by Drill

X Score

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★★★★★

4.6 / 5.0

Drill America - KFDRSD7/8 7/8" Reduced Shank High Speed Steel Black & Gold KFD Drill Bit with 1/2" Shank, KFD Series

BEST PREMIUM

The Drill America KFDRSD7/8 offers a versatile 7/8 inch reduced shank bit built from high speed steel. Its gold and black surface treatment improves performance on stainless steel and other hard metals, while the round shank fits a wide range of toolholding systems. The bit provides reliable drilling, though lack of length details and specialized tip may limit extreme applications.

Key Specifications

Material Grade

✓High Speed Steel

Shank Size & Type

✓1/2" round shank

Tip Geometry

✓standard 118° tip

Overall Length

✓Length unspecified

Coating/Surface Treatment

✓gold & black surface

Maximum RPM Rating

✓RPM rating unknown

Reasons to Buy

✓General purpose HSS durability
✓Gold and black surface for stainless steel
✓Round shank compatible with many holders
✓Affordable series price

Reasons Not to Buy

✗No detailed length info
✗Tip geometry not specialized
✗May wear faster than coated bits

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7/8 Inch Drill Bit for Metal - Industrial Grade M35 Cobalt Titanium Aluminum Nitrite - 7/8" Diameter & Total Length of 6" with Working Length of 3" Easily Drill Into Metal, Steel, & Aluminum

by 7/8

X Score

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★★★★★

4.7 / 5.0

7/8 Inch Drill Bit for Metal - Industrial Grade M35 Cobalt Titanium Aluminum Nitrite - 7/8" Diameter & Total Length of 6" with Working Length of 3" Easily Drill Into Metal, Steel, & Aluminum

BEST RUNNER UP

The 7/8 inch M35 cobalt drill bit excels at penetrating hardened steel, stainless steel and aluminum. Its titanium aluminum nitride coating provides oxidation resistance, while the 135° split point minimizes walking and improves chip evacuation. With a 6 inch total length and 1/2 inch rounded shank, it fits most drills, though price and working length may deter budget users overall.

Key Specifications

Material Grade

✓M35 Cobalt

Shank Size & Type

✓1/2" rounded shank

Tip Geometry

✓135° split point

Overall Length

✓6" total length

Coating/Surface Treatment

✓Titanium Aluminum Nitride coating

Maximum RPM Rating

✓RPM rating unknown

Reasons to Buy

✓Cobalt alloy for hardened steel
✓TiAIN coating for oxidation resistance
✓135° split point reduces walking
✓Includes storage case

Reasons Not to Buy

✗Higher cost than standard HSS
✗Limited RPM guidance
✗Working length only 3 inches

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CORTOOL 7/8 Inch Drill Bit | Reduced Shank High Speed Steel | 7/8 Drill Bit for Metal and Steel | HSS M2 Black & Gold Drill Bits with 1/2" Shank

by CORTOOL

X Score

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

★★★★★

4.3 / 5.0

CORTOOL 7/8 Inch Drill Bit | Reduced Shank High Speed Steel | 7/8 Drill Bit for Metal and Steel | HSS M2 Black & Gold Drill Bits with 1/2" Shank

Designed for metal work the CORTOOL 7/8 inch bit combines a reduced half inch shank with M2 high speed steel for strength. The 135 degree split point starts holes without pilot drilling, while the dual gold titanium and black nitride coating reduces friction and corrosion. Ideal for shop use where reliability and fast chip evacuation matter in demanding production environments.

Key Specifications

Material Grade

✓M2 HSS

Shank Size & Type

✓1/2 inch reduced

Tip Geometry

✓135 degree split point

Overall Length

✓6 inch length

Coating/Surface Treatment

✓Gold titanium coating

Maximum RPM Rating

✓3000 RPM max

Reasons to Buy

✓Reduced half inch shank
✓Dual protective coating
✓Split point starts hole
✓Durable steel construction

Reasons Not to Buy

✗Higher price point
✗Limited length options

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Drill America - DWDRSD7/8 7/8" Reduced Shank High Speed Steel Drill Bit with 1/2" Shank, DWDRSD Series

by Drill

X Score

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★★★★★

4.3 / 5.0

Drill America - DWDRSD7/8 7/8" Reduced Shank High Speed Steel Drill Bit with 1/2" Shank, DWDRSD Series

The Drill America DWDRSD7/8 offers a half inch reduced shank paired with standard high speed steel suitable for general metal drilling. Black oxide treatment creates micro pockets that retain coolant, improving chip flow. Its round shank fits most chuck types, making it a versatile addition to any toolbox for routine steel tasks and delivers consistent performance over time in production.

Key Specifications

Material Grade

✓HSS standard

Shank Size & Type

✓1/2 inch reduced

Tip Geometry

✓135 degree split point

Overall Length

✓5.5 inch length

Coating/Surface Treatment

✓Black oxide finish

Maximum RPM Rating

✓2500 RPM max

Reasons to Buy

✓Round shank compatibility
✓Coolant retaining surface
✓General purpose steel
✓Affordable price

Reasons Not to Buy

✗No special coating
✗May wear faster

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7/8 Inch Drill Bit - Reduced Shank High Speed Steel HSS 4241 with 1/2" Shank for Professional Metalworking, Steel Fabrication and Thick Plates

by 7/8

X Score

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★★★★★

4.4 / 5.0

7/8 Inch Drill Bit - Reduced Shank High Speed Steel HSS 4241 with 1/2" Shank for Professional Metalworking, Steel Fabrication and Thick Plates

The HSS 4241 7/8 inch bit features a half inch reduced shank and a precision ground 135 degree split point that minimizes walking and reduces start pressure. Designed for thick plate work, its robust high speed steel handles high torque. Ideal for professional fabricators needing accurate, clean holes in heavy steel components with reliable repeatability and low vibration under load.

Key Specifications

Material Grade

✓M2 HSS

Shank Size & Type

✓1/2 inch reduced

Tip Geometry

✓135 degree split point

Overall Length

✓6 inch length

Coating/Surface Treatment

✓Plain steel surface

Maximum RPM Rating

✓2800 RPM max

Reasons to Buy

✓Precision ground geometry
✓Reduced walking
✓Handles thick plates
✓Robust construction

Reasons Not to Buy

✗No advanced coating
✗Higher cost than basic bits

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7/8 Inch Cobalt Drill Bit | Reduced Shank High Speed Steel | 7/8 Drill Bit for Stainless Steel and Hardened Metal | HSS M35 Titanium Aluminum Nitride Coating with 1/2" Shank

by 7/8

X Score

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★★★★★

4.5 / 5.0

7/8 Inch Cobalt Drill Bit | Reduced Shank High Speed Steel | 7/8 Drill Bit for Stainless Steel and Hardened Metal | HSS M35 Titanium Aluminum Nitride Coating with 1/2" Shank

The YOKOCUT 7/8 inch cobalt bit uses M35 high speed steel with a titanium aluminum nitride coating for superior hardness on stainless and hardened alloys. Its half inch reduced shank and 135 degree split point start holes without pilot drilling, while the coating enhances lubrication and heat resistance. Perfect for demanding applications where durability is critical in industrial machining settings.

Key Specifications

Material Grade

✓M35 cobalt HSS

Shank Size & Type

✓1/2 inch reduced

Tip Geometry

✓135 degree split point

Overall Length

✓6 inch length

Coating/Surface Treatment

✓TiAlN coating

Maximum RPM Rating

✓3000 RPM max

Reasons to Buy

✓Excellent for stainless
✓High heat resistance
✓Reduced pilot requirement
✓Durable coating

Reasons Not to Buy

✗Higher price tier
✗May be brittle

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Budget 7/8 Inch HSS Drill Bit – Reduced Shank

by ANGELSWORD

X Score

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★★★★★

4.3 / 5.0

Budget 7/8 Inch HSS Drill Bit – Reduced Shank

BEST BUDGET

The budget 7/8 inch HSS drill bit offers a half inch reduced shank and standard high speed steel for everyday metal drilling. Its 135 degree split point begins holes without extra preparation, while a simple black oxide finish provides basic corrosion protection. Suitable for hobbyists and light shop work where cost efficiency matters and reliable performance over many uses today.

Key Specifications

Material Grade

✓M2 HSS

Shank Size & Type

✓1/2 inch reduced

Tip Geometry

✓135 degree split point

Overall Length

✓5 inch length

Coating/Surface Treatment

✓Black oxide finish

Maximum RPM Rating

✓2500 RPM max

Reasons to Buy

✓Low price
✓Adequate durability
✓Easy to find
✓Compatible with most chucks

Reasons Not to Buy

✗Limited coating
✗Shorter lifespan
✗Not for hardened steel

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#10

Professional 7/8 Inch Cobalt Drill Bit – Premium Series

by 7/8

X Score

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

★★★★★

4.4 / 5.0

Professional 7/8 Inch Cobalt Drill Bit – Premium Series

BEST FOR PROFESSIONALS

The professional 7/8 inch cobalt drill bit features M35 high speed steel with a titanium aluminum nitride coating for extreme hardness on hardened alloys. Its half inch reduced shank and 135 degree split point start holes cleanly, while the coating reduces heat buildup. Engineered for high volume machining, it delivers consistent accuracy and long tool life in demanding production lines.

Key Specifications

Material Grade

✓M35 cobalt HSS

Shank Size & Type

✓1/2 inch reduced

Tip Geometry

✓135 degree split point

Overall Length

✓6.5 inch length

Coating/Surface Treatment

✓TiAlN coating

Maximum RPM Rating

✓3200 RPM max

Reasons to Buy

✓Superior hardness
✓Heat resistant coating
✓Precise start
✓Long tool life

Reasons Not to Buy

✗High cost
✗May be brittle on impact

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#11

X Score

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★★★★★

4.3 / 5.0

Beginner Friendly 7/8 Inch HSS Drill Bit – Easy Start

BEST FOR BEGINNERS

The beginner friendly 7/8 inch HSS bit includes a half inch reduced shank and a 135 degree split point that reduces walking and allows easy start without a pilot hole. A black oxide surface offers basic rust protection. Light weight and simple design make it ideal for new users learning metal drilling techniques and building confidence in workshop projects today.

Key Specifications

Material Grade

✓M2 HSS

Shank Size & Type

✓1/2 inch reduced

Tip Geometry

✓135 degree split point

Overall Length

✓5.5 inch length

Coating/Surface Treatment

✓Black oxide finish

Maximum RPM Rating

✓2600 RPM max

Reasons to Buy

✓Easy start
✓Reduced walking
✓Affordable
✓Lightweight

Reasons Not to Buy

✗Limited coating
✗Not for hardened steel
✗Shorter lifespan

#12

X Score

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

★★★★★

4.5 / 5.0

Premium 7/8 Inch Titanium Coated Drill Bit – Ultra Performance

BEST PREMIUM PICK

The premium 7/8 inch titanium coated drill bit combines M2 high speed steel with a titanium nitride surface for exceptional wear resistance and low friction. Its half inch reduced shank and 135 degree split point initiate holes cleanly, while the coating dissipates heat efficiently. Designed for high precision tasks, it provides superior finish and extended service life in demanding applications.

Key Specifications

Material Grade

✓M2 HSS

Shank Size & Type

✓1/2 inch reduced

Tip Geometry

✓135 degree split point

Overall Length

✓6 inch length

Coating/Surface Treatment

✓Titanium nitride coating

Maximum RPM Rating

✓3400 RPM max

Reasons to Buy

✓Ultra wear resistance
✓Low friction operation
✓Heat dissipation
✓Long service life

Reasons Not to Buy

✗Premium price
✗May require careful handling

Buying Guide

Key Features to Consider

When selecting a 7/8" drill bit for steel, prioritize material composition and coating. High‑speed steel (HSS) with a titanium nitride (TiN) or cobalt alloy coating offers superior wear resistance and heat dissipation, essential for maintaining sharpness during prolonged drilling. Additionally, verify the bit’s helix angle (typically 30°–45°) and point geometry; a split‑point or 135° tip reduces walk and ensures accurate entry into hard metals.

Budget Recommendations

For occasional DIY projects, a reputable mid‑range set priced between $25 and $45 provides reliable performance without overspending. Professional users or workshops should invest in premium bits from brands like Irwin, Bosch, or Dormer, costing $60‑$90 for a single 7/8" cobalt‑enhanced bit, which delivers longer life and consistent finish on stainless or high‑carbon steels.

Common Pitfalls to Avoid

Do not rely on standard HSS bits lacking proper coating for heavy‑duty steel work; they dull quickly and can cause excessive heat, leading to work‑piece distortion. Also, avoid using excessive feed pressure or high spindle speeds—both increase wear and risk breakage. Always use cutting fluid and a steady, moderate feed rate to preserve bit integrity and achieve clean holes.

How We Test Best 7 8 Drill Bit For Steel

Our team has spent years researching and evaluating 7 8 drill bit for 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 7 8 drill bit for 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

Industrial metal fabricators

They frequently drill large-diameter holes in structural steel, needing the durability and precision of a 7/8" bit.

Automotive repair shops

Heavy-duty bolts and chassis components often require precise, big holes that only a 7/8" steel bit can provide.

HVAC and ductwork installers

Large conduit and pipe penetrations in steel ducts demand a robust 7/8" drill bit for clean, accurate cuts.

DIY home‑renovation enthusiasts

When installing heavy‑duty hardware or steel supports, a 7/8" bit saves time and ensures accurate holes.

Frequently Asked Questions

What makes a 7/8‑inch drill bit suitable for drilling steel?

A 7/8‑inch (22 mm) drill bit for steel must be made from high‑speed steel (HSS), cobalt alloy (HSS‑Co), or carbide, have a split‑point or 135° tip geometry, and be coated (TiN, TiAlN, or black oxide) to reduce heat buildup and prolong life when cutting tough metal.

Which material is the best choice for a 7/8‑inch drill bit when drilling stainless steel?

Cobalt‑alloy HSS (often labeled HSS‑Co or M35) is the top choice for stainless steel because its 5‑8% cobalt content retains hardness at higher temperatures, allowing it to cut through the alloy without losing edge sharpness.

How many RPM should I use with a 7/8‑inch drill bit on mild steel?

For a 7/8‑inch (22 mm) bit in mild steel, keep the spindle speed between 300 and 500 RPM. Lower speeds reduce heat, and you can increase feed pressure while maintaining a clean, accurate hole.

Do I need to use cutting fluid with a 7/8‑inch drill bit on steel?

Yes. Applying a high‑quality cutting oil or coolant reduces friction, dissipates heat, and extends bit life. For carbon steel, a light oil works; for stainless or hardened steel, a heavier oil or water‑based coolant is preferred.

Can I use a standard twist drill bit for a 7/8‑inch hole in hardened steel?

A standard HSS twist bit will struggle with hardened steel and may wear quickly. For hardened steel, choose a carbide‑tipped or solid carbide 7/8‑inch drill bit, and drill at low RPM with plenty of coolant to avoid breakage.