Best 17/32 Inch Drill Bits for Metal and Stainless Steel
Answering the question often asked by DIYers and professionals alike: which 17/32 inch drill bit performs best on hard metals? This guide highlights top options designed for tough materials like stainless steel, cast iron, and hardened alloys. Each selected bit is best for precision work, long-lasting wear resistance, and secure chuck fits. Use cases range from automotive repairs to fabrication projects, with clear notes on who benefits most from each pick.
Below is a quick summary of five strong 17/32″ drill bit choices, focusing on cobalt and high-speed steel (HSS) builds, coatings, and shank design for versatile toolholding. The table helps compare core traits at a glance and informs the buying decision.
| Product | Material Focus | Best For | Shank Type | Notable Pros |
|---|---|---|---|---|
| Drill America KFD | HSS with gold/black surface | General metalworking and stainless drilling | 1/2″ shank | Good wear resistance; versatile toolholding |
| VALYRIANTOOL 3-Pack | M35 cobalt HSSCO | Stainless steel and hard metals | 1/2″ reduced | 135° split point; lubricant pockets |
| Satcrft 17/32 | M35 cobalt HSS | Hard metals and stainless steel | 1/2″ shank | 135° split point; efficient chip removal |
| Narwhal 3-Pack | M35 cobalt | Metal, hardened steel, stainless steel | 1/2″ shank | Fully ground; includes storage case |
| BECOLLO 2-Pack | 5% cobalt HSS | Stainless and hard metals | 1/2″ reduced with 3 flats | 135° split point; secure chuck grip |
Drill America KFD 17/32″ Reduced Shank HSS Bit
This high-speed steel bit combines a durable KFD series design with a 1/2″ shank for wide compatibility in varied chucks. The gold and black surface treatment supports drilling in stainless steel and other hard metals, while maintaining toughness for general purpose use. Best for metalworking tasks that require a balance of wear resistance and accessibility in common drill chucks.
Who it’s best for: apprentices and automotive/machining hobbyists seeking a resilient, versatile drill bit with broad compatibility. Why selected: solid wear resistance and practical coating choices make it a reliable first choice for mixed metal drilling. Caution: non-coated areas may wear faster when drilling very hard alloys without adequate lubrication.
VALYRIANTOOL 3-Pack 17/32″ Cobalt Bits
These bits use M35 cobalt HSSCO to deliver enhanced wear resistance and longer life in hard metals. The 135-degree split point helps center holes quickly on stainless steel and other tough materials, while the round shank provides broad compatibility with many toolholding systems. Best for: users drilling repeatedly into stainless steel or hardened alloys where edge retention matters. Better for: longer multi-hole tasks compared to standard HSS bits. Limitation: the 3-flat shank requires compatible chucks or adaptors for optimal grip.
Satcrft 17/32″ Cobalt Drill Bit, 135° Split
Made from 5% cobalt (M35) and heat-treated to high hardness, this bit is designed for stubborn materials that heat up quickly. The 135° split point minimizes wandering and starts holes cleanly on smooth metal and stainless steel. The large spiral flute aids in chip removal, enabling faster drilling. Best for: high-temperature stainless steel drilling and long, accurate holes. Caution: expect higher initial cost than standard HSS bits, but with longer service life in demanding tasks.
Narwhal 3-Pack 17/32″ Cobalt Bits
Narwhal’s trio emphasizes industrial-grade M35 cobalt with fully ground bits and a 135-degree split point for precise starting holes in hard metals. The included plastic storage case helps keep bits organized for repeated use in workshops or job sites. Best for: professional settings where consistent precision is required across multiple stainless or hardened metal projects. Limitation: the three-piece set may be overkill for casual, single-task users.
BECOLLO 2-Pack 17/32″ Cobalt Drill Bit
BECOLLO offers a 1/2″ reduced shank with 3 flats, designed to secure an extra-tight grip in your chuck. The 5% cobalt content improves wear and heat resistance, while a 135° split point helps keep cuts centered. Best for: repeated drilling in hard metals where chuck stability matters. Caution: ensure your drill chuck accepts reduced 1/2″ shanks and 3-flat designs for best performance.
Buying Guide: Key Considerations for 17/32″ Cobalt and HSS Bits
- Material and cobalt content: Higher cobalt (5%) enhances heat resistance and life in stainless steel and hardened metals. Choose M35 cobalt for challenging drilling tasks.
- Tip design: A 135-degree split point reduces wandering and improves starting accuracy, especially on smooth or polished metals.
- Coatings: Gold/black or TiAlN coatings reduce friction, improve lubricity, and extend bit life in high-temperature drilling. Coated bits can be more forgiving in stainless.
- Shank and chuck compatibility: Full round shanks fit most drill chucks; reduced shanks with flats or 3-flats require compatible chucks for best grip. Ensure shank size matches your drill inventory.
- Bit length and flute design: Longer flute or tapered web designs aid chip removal, enabling faster drilling in metals that clog or heat quickly.
- Set vs. single bits: Sets are useful for professionals and shops needing multiple bits; individuals drilling varied metals may prefer a few top-performing bits rather than a larger assortment.
- Application notes: For hard metals like stainless steel, choose cobalt alloys with high heat resistance. For general-purpose metal drilling, high-speed steel variants may suffice but wear lifetimes will be shorter.
Frequently Asked Questions
- What does 17/32 inch refer to on drill bits?
- Are cobalt bits worth the extra cost?
- Why choose a 135-degree split point?
- What is a reduced shank?
- How should I care for cobalt bits?
- Can I use these bits in standard home drill presses?
It denotes the diameter of the drill bit’s cutting edge. For holes that size, ensure your drill and workpiece can accommodate the diameter safely.
Yes for hard metals and stainless steel, where edge retention and reduced wear justify the higher price through longer bit life.
It helps prevent walking during starting holes, improving precision on smooth metal surfaces.
A reduced shank is smaller than the cutting portion, designed to fit smaller chucks while maintaining bit diameter for the cut. Ensure your chuck supports it.
Use proper lubrication, avoid overheating, and store bits in their case or organizers to prevent chipping and corrosion.
Yes, provided the chuck accepts 1/2″ shanks or reduced shank configurations listed by the product, and the drill is rated for metal drilling tasks.