Best 35/64 Drill Bits for Metal Tackling Hard Materials With Cobalt
When drilling hard metals, you need a 35/64 drill bit that can hold up under high heat and avoid wandering. The best picks here are cobalt or high-speed steel bits with a 135° split point for precise starts. This guide highlights five top options suitable for stainless steel, cast iron, and other tough alloys. Each product is chosen for durability, ease of use, and suitability for common metalworking tasks. The buyer types best served by these bits range from DIY enthusiasts to professionals handling persistent metalwork challenges.
Summary of selected products:
| Product | Best For | Key Benefit | Shank |
|---|---|---|---|
| Satcrft 35/64 Inch Cobalt Drill Bit | Hard metals, general fabrication | 5% cobalt, HRC 67, self-centering split point | M35 HSS |
| Narwhal 3 Pack 35/64″ Cobalt Bits | Organized metal drilling kits | Three bits with 135° split point | Round shanks |
| Yellow Paw 35/64″ Drill Bit with TiAIN Coating | Stainless and hardened steels | TiAIN coating for wear resistance | Shank 35/64″ |
| Meccion 35/64″ Cobalt Drill Bit | Cast iron and stainless steel | HRC 67 hardness, precise pilot point | Round shank |
| Drill America DWDRSD35/64 | General purpose with reduced shank | Black oxide improves lubricity | 1/2″ shank |
Satcrft 35/64 Inch Cobalt Drill Bit
Product features: Made from M35 HSS with 5% cobalt, heat treated to HRC 67 hardness for outstanding wear resistance and high-temperature stability. The 135° split point provides self-centering action, reducing thrust and preventing walking. Cobalt steel resists overheating, enabling faster drilling speeds on hard metals. Suitable for cast iron, stainless steel, alloy steel, and non-ferrous metals in industrial applications.
Best for: Professionals or serious hobbyists drilling hard metals like stainless steel and cast iron. Why selected: Highest hardness and self-centering geometry reduce wandering. Limitation: May require proper lubrication to maximize life in very tough alloys.
Drill America KFDRSD35/64 35/64″ Reduced Shank Bit
Product features: High-speed steel with a gold and black surface treatment for use in stainless steel and other hard metals. Round shanks enable compatibility with a wide range of toolholding systems. Suitable for general-purpose drilling with a reduced shank for access in tight spaces.
Best for: Shops needing versatile, general-purpose bits that still perform well in harder metals. Why selected: Good balance of toughness and hardness with broad compatibility. Limitation: Not specifically cobalt-rich, so wear resistance is lower than M35 cobalt options.
Narwhal 3 Pack 35/64 Cobalt Drill Bits
Product features: Three cobalt bits, 5% cobalt content, 135° split point for reduced walking. Fully ground for precision drilling and a durable plastic case for organization.
Best for: Those who want a ready-to-use set for metalworking and reliable mid-level wear resistance. Why selected: The 3-pack offers value and quick replacements. Limitation: Case is plastic, which may wear with heavy field use.
Yellow Paw 35/64 Inch Drill Bit with TiAIN Coating
Product features: 35/64″ diameter, total length 6″, with a working length of 3″. M35 cobalt with TiAIN coating, providing oxidation and wear resistance. 135° split point reduces walking on hard materials.
Best for: Users drilling harder steels and aluminum with a need for extended bit life. Why selected: Titanium nitride coating extends life and reduces friction. Limitation: Coating can wear off if aggressively used on very abrasive materials.
Rannb 35/64″/14mm Twist Drill Bit HSS
Product features: High-speed steel with high hardness and good toughness. 14mm shank, total length 6.0″. Flute length 76mm. Applications include aluminum, iron, plastic, and wood when using a drill.
Best for: Mixed-material projects or light fabrication where a standard HSS bit is sufficient. Why selected: Strong balance of cost and performance for general metal and non-metal drilling. Limitation: Not cobalt-rich, so performance may decline in very hard metals.
Meccion 35/64 Inch Cobalt Drill Bit
Product features: 5% cobalt HSS with heat treatment achieving up to HRC 67. 135° pilot point for reduced walking. Straight round shank for better concentricity and precise results.
Best for: Professionals drilling cast iron, stainless steel, and other hard metals. Why selected: High hardness and precise tip help minimize wandering. Limitation: Life expectancy depends on material hardness and use conditions.
Drill America DWDRSD35/64 35/64″ Reduced Shank Bit
Product features: High-speed steel with black oxide treatment for lubricity and coolant retention near the cutting edge. Round shanks for broad compatibility with toolholding systems.
Best for: General-purpose metal drilling with improved lubricity and coolant retention. Why selected: Good all-around performance with enhanced surface lubricity. Limitation: Not specifically cobalt-based, so wear resistance is lower than cobalt variants.
Buying Guide: 35/64 Drill Bits For Metal – Key Considerations
What material will you drill most often? Cobalt bits (5% cobalt) excel in hard metals like stainless steel and cast iron. For softer metals, standard HSS may suffice, but cobalt options still extend life in busy workshops.
Which shank size suits your tooling? Reduced shank bits fit tighter spaces, while full-thickness shanks provide broader compatibility with standard chucks. If you use a compact drill or a drill press with limited quill travel, a reduced shank often helps.
Is the point geometry important? A 135° split point minimizes walking on hard materials and accelerates hole starts. It’s a deciding factor when you work with stainless steel or other tough alloys.
Coatings and coatings life: TiAIN coatings reduce wear and heat buildup, increasing bit life in aggressive drilling. Coatings do not replace proper cutting fluids or lubrication when required by the material.
Set composition matters: Sets (like Narwhal’s 3-pack) provide value and replacement options. Mixed sets can help minimize downtime in busy shops, but ensure each bit’s length and shank fit your machines.
Frequently Asked Questions
- Q: Are cobalt bits worth the extra cost for everyday metal drilling?
- A: For frequent hard-metal work, cobalt bits offer longer life and better heat resistance, which can reduce tool changes and increase productivity.
- Q: What does a 135° split point do?
- A: It helps start holes accurately and reduces wandering, especially in hard materials.
- Q: Should I use lubricant with cobalt bits?
- A: Lubricants or coolants are recommended for hard metals to improve tool life and hole quality, depending on the material and drill size.
- Q: How do I choose between a full shank and reduced shank?
- A: Reduced shanks fit into tight spaces or smaller chucks; full shanks are more versatile with standard toolholding systems.
- Q: Can I use these bits on aluminum?
- A: Yes, many 35/64 cobalt bits perform well on aluminum, but ensure proper feed rate to avoid excessive heat.