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Best Drill Bit For 1 8 Angle Iron

Tom Woodward

Senior reporter

★★★★★5.0

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Today

6 min read

Looking for the best drill bit for 1 8 angle iron in March 2026? We reviewed 8 popular options from brands like 1/8", Bosch, Narwhal, ForgeWorx, Carbide, Drill, Solid, Greycore 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 1 8 angle iron that performs well and holds up over time, this shortlist will help you choose with confidence.

Our Top Picks

Best Overall

1/8" Solid Carbide Jobber Drill Bits with Straight Shank and 118° Point Angle, Made from Tungsten Carbide Material,2-Pieces

★★★★★★4.8

Material:Tungsten Carbide

Point Angle:118° Point

Shank Type:Straight Shank

Flute / Overall Length:0.98" Flute, 1.69" Overall

Diameter:0.125" Diameter

Coating:Uncoated Surface

Ultra‑rigid 1/8" carbide bits drill stainless steel, alloy steel, and hard plastics with unmatched precision and longevity.

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Best Value

Bosch CO2135B 1/8 in. X 2-3/4 in. Cobalt M42 Drill Bit

★★★★★★4.7

Material:M42 Cobalt

Point Angle:135° Split

Shank Type:Straight Shank

Flute / Overall Length:2.75" Overall

Diameter:0.125" Diameter

Coating:Uncoated Surface

Bosch M42 cobalt 1/8" bit resists heat, drills stainless steel and titanium cleanly, delivering premium performance at a budget price.

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Best Premium

Narwhal 1/8 Inch Cobalt Drill Bits (13 Pack - Industrial Grade M35 Cobalt) 2.55" Length & 135 Degree Split Point for Drilling Into Metal, Hardened & Stainless Steel, Cast Iron, & More!

★★★★★★4.8

Material:M35 Cobalt

Point Angle:135° Split

Shank Type:Straight Shank

Flute / Overall Length:1.38" Flute, 2.55" Overall

Diameter:0.125" Diameter

Coating:Uncoated Surface

Narwhal 13‑piece M35 cobalt set offers fully‑ground 135° split‑point bits, delivering clean entry and value for frequent metal drilling.

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Detailed Reviews

What to Look For Drill Bit For 1 8 Angle Iron

Material

Determines rigidity and wear resistance; carbide offers superior longevity for hard steels, while HSS is cheaper but dulls faster under high loads.

Point Angle

Affects cutting efficiency on metal; 118° provides balanced thrust for general steel, whereas 135° reduces thrust for tougher alloys and minimizes burrs.

Shank Type

Ensures compatibility with the chuck and torque transfer; straight shanks fit standard chucks, while SDS or quick‑change shanks may improve grip and speed.

Flute / Overall Length

Longer flutes allow deeper hole drilling and better chip evacuation; overall length must suit the machine’s depth capacity and provide stability.

Diameter

Specifies the hole size; for 1/8" angle iron the exact 0.125" (or 3.2 mm) diameter is critical to maintain structural integrity and fit fasteners.

Coating

Reduces friction and heat buildup; TiN or TiAlN coatings extend tool life and improve performance on stainless or hardened steels compared with uncoated bits.

by 1/8"

X Score

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

★★★★★

4.8 / 5.0

1/8" Solid Carbide Jobber Drill Bits with Straight Shank and 118° Point Angle, Made from Tungsten Carbide Material,2-Pieces

BEST OVERALL

These solid carbide bits deliver exceptional stiffness and wear resistance, making them ideal for drilling stainless steel, alloy steel, and hard plastics. The 118° point starts quickly while the straight shank fits standard chucks. Their 0.125" diameter and 0.98" flute length provide precise, deep holes. Though pricier than HSS, performance justifies the expense for professional machining and repair tasks everyday.

Key Specifications

Material

✓Tungsten Carbide

Point Angle

✓118° Point

Shank Type

✓Straight Shank

Flute / Overall Length

✓0.98" Flute, 1.69" Overall

Diameter

✓0.125" Diameter

Coating

✓Uncoated Surface

Reasons to Buy

✓Extreme rigidity
✓Long tool life
✓Versatile material range
✓Jobber length convenient

Reasons Not to Buy

✗Higher cost than HSS
✗Limited to small diameters

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by Bosch

X Score

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

★★★★★

4.7 / 5.0

Bosch CO2135B 1/8 in. X 2-3/4 in. Cobalt M42 Drill Bit

BEST VALUE

The Bosch CO2135B cobalt bit offers M42 alloy strength with eight percent cobalt, resisting heat and wear during prolonged stainless steel or titanium drilling. Its 0.125" diameter and 2.75" overall length fit most hand drills, while the 135° split tip starts cleanly. The lack of coating may reduce lifespan in abrasive applications, but value remains strong for everyday projects anywhere.

Key Specifications

Material

✓M42 Cobalt

Point Angle

✓135° Split

Shank Type

✓Straight Shank

Flute / Overall Length

✓2.75" Overall

Diameter

✓0.125" Diameter

Coating

✓Uncoated Surface

Reasons to Buy

✓High heat resistance
✓Extended tool life
✓Excellent for stainless steel
✓Affordable price

Reasons Not to Buy

✗No coating for wear
✗Limited to small lengths

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by Narwhal

X Score

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

★★★★★

4.8 / 5.0

Narwhal 1/8 Inch Cobalt Drill Bits (13 Pack - Industrial Grade M35 Cobalt) 2.55" Length & 135 Degree Split Point for Drilling Into Metal, Hardened & Stainless Steel, Cast Iron, & More!

BEST PREMIUM

Narwhal 13‑piece M35 cobalt set provides a cost‑effective solution for frequent metal drilling. Each 0.125" bit is fully ground with a 135° split point, delivering clean entry and reduced walking in hardened steel, cast iron, and titanium. The 1.38" flute length allows moderate depth, while the uncoated surface may wear faster under heavy use for professional workshops and DIY projects everywhere.

Key Specifications

Material

✓M35 Cobalt

Point Angle

✓135° Split

Shank Type

✓Straight Shank

Flute / Overall Length

✓1.38" Flute, 2.55" Overall

Diameter

✓0.125" Diameter

Coating

✓Uncoated Surface

Reasons to Buy

✓Pack of 13 saves money
✓Fully ground precision
✓Split point reduces walking
✓Durable plastic case

Reasons Not to Buy

✗No coating wears faster
✗Limited to small holes

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ForgeWorx 1/8 Inch Cobalt Drill Bits 2pcs Heavy-Duty Metal Drill Bit Set for Steel, Cast Iron, TiAlN Coating, 1/4" Hex Shank (1/8" x 4")

by ForgeWorx

X Score

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

★★★★★

4.7 / 5.0

ForgeWorx 1/8 Inch Cobalt Drill Bits 2pcs Heavy-Duty Metal Drill Bit Set for Steel, Cast Iron, TiAlN Coating, 1/4" Hex Shank (1/8" x 4")

BEST RUNNER UP

The ForgeWorx duo offers 0.125" M35 cobalt bits with a durable TiAlN coating that lowers temperature and extends life during steel, cast iron, and titanium drilling. Their 1/4" hex shank fits securely in impact drivers, while the 4" overall length reaches deep passages. Limited to two pieces and lacking a case, they remain a solid professional choice for demanding jobs.

Key Specifications

Material

✓M35 Cobalt

Point Angle

✓118° Point

Shank Type

✓1/4" Hex Shank

Flute / Overall Length

✓4" Overall

Diameter

✓0.125" Diameter

Coating

✓TiAlN Coating

Reasons to Buy

✓TiAlN coating reduces heat
✓Hex shank prevents wobble
✓Long 4" length for deep holes
✓M35 cobalt durability

Reasons Not to Buy

✗Only two pieces
✗No storage case

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Carbide Drill Bit Set for Hardened Steel Stainless Steel Hot Working Steel Metal 1/16 3/16 1/8 1/4 Inch 4 Pcs CNC Tungsten Solid Carbide Twist Drill Bits Set 135° Point Angle

by Carbide

X Score

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

★★★★★

4.4 / 5.0

Carbide Drill Bit Set for Hardened Steel Stainless Steel Hot Working Steel Metal 1/16 3/16 1/8 1/4 Inch 4 Pcs CNC Tungsten Solid Carbide Twist Drill Bits Set 135° Point Angle

BEST PREMIUM PICK

These four carbide drills cover sizes from 1/16 to 1/4 inch and feature a 135° tip that cuts hard stainless and hot‑working steel with reduced walk. The TiAlSi coating endures temperatures above 1300°C, preserving edge sharpness. Rigid solid carbide ensures tolerance within ±0.003 mm, making the set ideal for precision machining tasks. It performs reliably in both manual and CNC operations.

Key Specifications

Material

✓Solid Tungsten Carbide

Point Angle

✓135° Point Angle

Shank Type

✓Straight Shank

Flute / Overall Length

✓Varied Lengths

Diameter

✓1/16 to 1/4

Coating

✓TiAlSi Coating

Reasons to Buy

✓Excellent rigidity
✓Long tool life
✓Precise tolerance
✓Effective in hard steel

Reasons Not to Buy

✗Higher cost
✗Limited to small diameters

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Drill America - KFD1/8P12 1/8" High Speed Steel Black & Gold KFD Split Point Drill Bit (Pack of 12), KFD Series

by Drill

X Score

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

★★★★★

4.3 / 5.0

Drill America - KFD1/8P12 1/8" High Speed Steel Black & Gold KFD Split Point Drill Bit (Pack of 12), KFD Series

BEST BUDGET

The Drill America split‑point HSS set offers twelve 1/8 inch bits at an affordable price. A 135° split tip stops walking on wood, metal and even stainless surfaces, while the round shank fits most chucks. No coating keeps cost low, but the bits wear faster in hardened steel. Ideal for general workshop use. They also handle plastics and composites adequately.

Key Specifications

Material

✓High Speed Steel

Point Angle

✓135° Split Point

Shank Type

✓Round Shank

Flute / Overall Length

✓Assorted Lengths

Diameter

✓1/8 Inch

Coating

✓No Coating

Reasons to Buy

✓Affordable
✓Good for wood and metal
✓Split point reduces walking
✓Pack of twelve

Reasons Not to Buy

✗Lower durability in hardened steel
✗No coating

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Solid Carbide 1/8 Drill Bit for Hardened Steel Stainless Steel Hot Working Steel Metal CNC Tungsten Carbide Jobber Drill Bits 135° Point Angle 5PCS

by Solid

X Score

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

★★★★★

4.3 / 5.0

Solid Carbide 1/8 Drill Bit for Hardened Steel Stainless Steel Hot Working Steel Metal CNC Tungsten Carbide Jobber Drill Bits 135° Point Angle 5PCS

BEST FOR BEGINNERS

YFTOOL provides five solid carbide 1/8 inch drills designed for stainless and hot‑working steels. The 135° geometry reduces cutting forces, while TiAlSi coating resists heat and abrasion above 1300°C. Tight ±0.003 mm tolerance delivers accurate holes in demanding applications. Although single size limits versatility, the durability justifies the premium price. Consistent performance in CNC and manual drills yields clean holes every.

Key Specifications

Material

✓Solid Tungsten Carbide

Point Angle

✓135° Point Angle

Shank Type

✓Straight Shank

Flute / Overall Length

✓Standard Length

Diameter

✓1/8 Inch

Coating

✓TiAlSi Coating

Reasons to Buy

✓High hardness coating
✓Consistent 135° geometry
✓Tight tolerance
✓Ideal for stainless

Reasons Not to Buy

✗Single size only
✗Expensive for one bit

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Greycore Tools 1/8 Inch x 6 Inch Cobalt Aircraft Extension Bit – 2 Pack M35 Cobalt Drill Bit, Industrial Titanium Coating – Drill Bits for Steel, Hard Metal, Cast Iron, Wood, Plastic (1/8" x 6")

by Greycore

X Score

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

★★★★★

4.5 / 5.0

Greycore Tools 1/8 Inch x 6 Inch Cobalt Aircraft Extension Bit – 2 Pack M35 Cobalt Drill Bit, Industrial Titanium Coating – Drill Bits for Steel, Hard Metal, Cast Iron, Wood, Plastic (1/8" x 6")

BEST FOR PROFESSIONALS

Greycore offers two 1/8 × 6 inch M35 cobalt bits with a titanium coating for deep drilling. The 118° point angle and cobalt alloy handle high heat, allowing fast penetration in steel, cast iron and hard metal. The long shank reaches deep slots, but the bits are heavier than standard HSS and limited to a single diameter. Sharpness endures through repeated drilling cycles.

Key Specifications

Material

✓M35 Cobalt Steel

Point Angle

✓118° Point Angle

Shank Type

✓Straight Shank

Flute / Overall Length

✓6‑Inch Length

Diameter

✓1/8 Inch

Coating

✓Titanium Coating

Reasons to Buy

✓Extended length for deep holes
✓Cobalt resists heat
✓Titanium coating adds wear resistance
✓Durable in cast iron

Reasons Not to Buy

✗Heavier than HSS
✗Limited to 1/8 inch

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Buying Guide

Key Features to Consider

When drilling 1/8" angle iron, prioritize a high‑speed steel (HSS) or cobalt‑based bit with a split‑point tip for precise entry and reduced wandering. A 90° or 135° split‑point geometry minimizes the need for pilot holes, while a reinforced shank—either a solid round or a hex‑fit—prevents wobble in high‑torque applications. Look for bits with a carbide‑tipped edge if you frequently work with hardened steel, as they retain sharpness longer under heat.

Budget Recommendations

For occasional DIY projects, a 3‑piece HSS set priced between $15‑$30 offers sufficient durability without breaking the bank. Professionals handling larger volumes should invest in a cobalt‑based 5‑piece set ranging from $45‑$70; the extra cost pays off in longer tool life and smoother cuts. If you need the utmost performance, a premium carbide‑tipped single‑bit can run $20‑$35 per piece, delivering the best edge retention for hardened angle iron.

Common Pitfalls to Avoid

Do not use standard wood or masonry bits; they lack the hardness and geometry needed for steel and will dull quickly. Avoid excessive feed pressure—forcing the bit can cause heat buildup, loss of sharpness, and work‑piece deformation. Finally, neglecting proper lubrication, such as cutting oil, leads to premature wear and may jam the bit, compromising both safety and accuracy.

How We Test Best Drill Bit For 1 8 Angle Iron

Our team has spent years researching and evaluating drill bit for 1 8 angle iron 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 1 8 angle iron 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 1/8‑inch angle iron for structural components and need a bit that can handle the hardness and thin profile.

DIY home‑renovation enthusiasts

When building custom shelving, frames, or brackets, a 1/8 angle‑iron drill bit lets them create clean, accurate holes without splintering the metal.

Automotive mechanics

Repairing or fabricating brackets, roll cages, and exhaust supports often involves drilling thin angle iron to mount parts securely.

Construction contractors

They need to pre‑drill holes in lightweight steel angles for fasteners during framing, ensuring alignment and reducing on‑site rework.

Frequently Asked Questions

What type of drill bit is best for drilling 1/8‑inch angle iron?

A high‑speed steel (HSS) or cobalt (M42) twist drill with a 135° split‑point tip works best. For tougher stainless‑steel angles, a carbide‑tipped bit is preferred.

Should I use a drill press or a hand drill for 1/8 angle iron?

A drill press is recommended because it provides consistent pressure, precise alignment, and better chip evacuation, reducing the risk of the bit wandering or breaking.

What drill speed (RPM) is optimal for a 1/8‑inch angle iron?

For HSS or cobalt bits, keep the speed between 1,000–1,500 RPM. If you’re using carbide bits, you can increase to 2,000–2,500 RPM. Always start slower and adjust based on chip formation.

Do I need to lubricate or cool the drill bit when drilling angle iron?

Yes. Apply a few drops of cutting oil or a light coolant before starting and re‑apply every few seconds. This reduces heat, prolongs bit life, and improves hole quality.

How can I prevent the bit from breaking or the hole from being crooked?

Clamp the angle iron securely, center‑punch the start point, use a pilot hole (¼‑inch or smaller) before the final size, and feed the bit at a steady, moderate pressure while maintaining the recommended RPM.