Round Drill Set Twist 115 Piece M35 14mm Drill Bit For Steel
M35 Cobalt Fully-Ground Twist Drill Set – Ideal for Stainless Steel – 115-Piece Round-Shank Kit
Engineered for shops that drill tough metals all day, this 115-piece M35 cobalt HSS (≈5% Co) drill set pairs a fully-ground body with a 135° split point for fast, self-centering starts and cleaner, rounder holes. The round-shank, jobber-length design fits any 3-jaw chuck, while the heavy-duty metal index case keeps every size organized for quick picks on the bench or at the jobsite.
Why it performs
Built for stainless: M35 cobalt maintains edge hardness at high temperature—perfect for 304/316 stainless, carbon & alloy steels, and cast iron.
Clean starts, less walking: 135° split-point reduces thrust, skidding, and burr at breakthrough.
Fully ground flutes: Better concentricity and chip evacuation = smoother holes, longer life.
Complete size coverage: One case covers pilots to large holes—no more hunting for the right bit.
Shop-ready storage: Labeled metal index with tight wells and durable hinge for daily use.
What’s in the 115-piece kit
| Series | Range | Count |
|---|---|---|
| Numbered | #1–#60 | 60 |
| Letter | A–Z | 26 |
| Fractional (inch) | 1/16"–1/2" by 1/64" | 29 |
| Total | 115 |
Technical specifications
| Feature | Details |
|---|---|
| Substrate | M35 Cobalt High-Speed Steel (≈5% Co) |
| Geometry | 135° split-point, web-thinned (self-centering, low thrust) |
| Flutes | Fully ground twist flutes, polished for chip flow |
| Length Type | Jobber (ANSI/DIN 338 equivalent) |
| Shank | Round, 3-jaw chuck compatible |
| Finish | Bright ground (optional Black & Gold / Black Oxide/Gold ) |
| Hardness (typ.) | ≥ HRC 66 after heat treatment |
| Tolerances | Tight runout/concentricity; size laser-marked (option) |
| Recommended Materials | Stainless (304/316), carbon & alloy steel, cast iron, bronze/brass, aluminum |
| Resharpenable | Yes—maintain split-point geometry |
| Storage | Metal index case, labeled trays for Number/Letter/Fractional |
Speed & feed quick guide (rule-of-thumb)
| Material | Surface Speed (SFM) | Notes |
|---|---|---|
| Stainless 304/316 | 25–40 | Use cutting oil; peck on deep holes |
| Carbon/Alloy Steel | 40–70 | Coolant/oil extends life |
| Cast Iron | 50–80 | Dry or minimal oil; avoid rubbing |
| Aluminum/Brass | 150–250 | Light oil optional for finish |
Typical applications
Fabrication & MRO: brackets, channel, plate, frames, handrails
Electrical/HVAC: panels, enclosures, pilot holes for knockouts
Automotive/Upfit: mounts, fastener prep, stainless trim
General workshop: jigs, fixtures, small-batch production
Packaging & OEM options
Case: heavy-gauge metal index, labeled wells, retail sleeve & barcode
Wholesale: master cartons for distributors; spare tray sets available
OEM/Private label: custom assortments (metric/imperial/mixed), finish options, laser-etched sizes, EN/RU bilingual labels, spec sheets with your branding
FAQ
Q1: Will these drill stainless reliably?
Yes—M35 cobalt + 135° split-point are designed for stainless. Use lower RPM, cutting oil, and peck cycles.
Q2: Impact-driver compatible?
Round shanks are for 3-jaw chucks. Ask about hex-shank cobalt variants for impact drivers.
Q3: Can I resharpen them?
Absolutely. Regrind while keeping the split-point geometry; M35 grinds cleanly.
Q4: Metric version available?
Yes—metric and mixed maps are available for OEM orders.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.