ZHANGJIAGANG FLAME MACHINERY CO.,LTD.
| Payment Terms | L/C, D/P, T/T, Western Union |
| Supply Ability | 300,0000PCS PER MOUTH |
| Delivery Time | 30-45days |
| Packaging Details | metal box |
| Type | Twist Drill Bit |
| Use | Metal Drilling |
| Material | HSS-M35 |
| Product name | 21PCS Drill Bit Set |
| Application | Drilling Holes,Stainless Steel,concrete etc. |
| Shank | Round/Three-flatted/Hex shank and so on |
| Process | Fully Ground |
| Color | Amber color |
| Feature | Sharpness,High Speed.Straight Smooth Edge,Longer Working Life |
| Packing | Aluminium case or as your request |
| Brand Name | XRTOOLS |
| Model Number | 21PC |
| Certification | ISO9000 |
| Place of Origin | CHINA |
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Product Specification
| Payment Terms | L/C, D/P, T/T, Western Union | Supply Ability | 300,0000PCS PER MOUTH |
| Delivery Time | 30-45days | Packaging Details | metal box |
| Type | Twist Drill Bit | Use | Metal Drilling |
| Material | HSS-M35 | Product name | 21PCS Drill Bit Set |
| Application | Drilling Holes,Stainless Steel,concrete etc. | Shank | Round/Three-flatted/Hex shank and so on |
| Process | Fully Ground | Color | Amber color |
| Feature | Sharpness,High Speed.Straight Smooth Edge,Longer Working Life | Packing | Aluminium case or as your request |
| Brand Name | XRTOOLS | Model Number | 21PC |
| Certification | ISO9000 | Place of Origin | CHINA |
| High Light | m35 drill bit set ，m35 drill set twist ，round drill bit set | ||
Built for shops that can’t afford to slow down, the XRTOOLS 21-Pc M35 Cobalt Drill Bit Set combines a 135° split-point tip with HSS-Co (M35, ~5% cobalt) substrate to slice through tough metals with less walking, lower thrust, and cleaner holes. Each bit is precision-ground for concentricity, then matched to a labeled index case so the right size is always within reach—on the bench, in the truck, or at the jobsite.
| Feature | Details |
|---|---|
| Material | HSS-Co M35 (~5% cobalt), fully ground |
| Tip Geometry | 135° split point (self-centering; reduced walking) |
| Flutes | Precision-ground twist flutes, optimized chip evacuation |
| Length Type | Jobber length |
| Shank | Straight round; fits 3-jaw chucks |
| Finish | Bright ground (options: black oxide, black & gold) |
| Hardness | ≥ HRC 66 (typical for M35 after heat treatment) |
| Recommended Materials | Stainless (304/316), carbon & alloy steel, cast iron, brass/bronze |
| Coolant Use | Cutting oil recommended on stainless & thick stock; peck for heat control |
| Included Count | 21 pieces (fractional sizes; see map below) |
| Case | Heavy-duty metal index case with size-stamped wells |
| Compliance | Manufactured to tight concentricity and run-out tolerances |
Cut quality & accuracy: The 135° split point self-centers and reduces burrs, improving hole roundness and surface finish in steel and stainless.
Throughput & uptime: Cobalt hot-hardness resists edge softening at elevated temps, enabling slower change-outs and fewer regrinds.
Longevity & TCO: M35’s wear resistance + fully ground flutes deliver long life, lowering cost per hole over standard HSS.
Operator friendly: Lower feed pressure and reduced walking mean faster starts and safer handling on hand drills and presses.
Shop-ready packaging: Metal index case with clear size callouts speeds tool selection and inventory counting.
Metals: stainless (304/316), carbon steel, alloy steel, cast iron, and hard non-ferrous (bronze/brass).
Fabrication & MRO: brackets, channel, plate, enclosures, frames, handrails, fastener prep.
Electrical/HVAC/Auto: panel work, conduit knockouts (pilot), mounting holes, vehicle upfits.
Note: For thick austenitic stainless, use cutting oil and lower RPM; peck to manage chips and heat.
| Size (in) | Decimal (in) | Metric (mm) |
|---|---|---|
| 1/16 | 0.06250 | 1.59 |
| 5/64 | 0.07812 | 1.98 |
| 3/32 | 0.09375 | 2.38 |
| 7/64 | 0.10938 | 2.78 |
| 1/8 | 0.12500 | 3.17 |
| 9/64 | 0.14062 | 3.57 |
| 5/32 | 0.15625 | 3.97 |
| 11/64 | 0.17188 | 4.37 |
| 3/16 | 0.18750 | 4.76 |
| 13/64 | 0.20312 | 5.16 |
| 7/32 | 0.21875 | 5.56 |
| 15/64 | 0.23438 | 5.95 |
| 1/4 | 0.25000 | 6.35 |
| 17/64 | 0.26562 | 6.75 |
| 9/32 | 0.28125 | 7.14 |
| 19/64 | 0.29688 | 7.54 |
| 5/16 | 0.31250 | 7.94 |
| 21/64 | 0.32812 | 8.33 |
| 11/32 | 0.34375 | 8.73 |
| 23/64 | 0.35938 | 9.13 |
| 3/8 | 0.37500 | 9.52 |
Material: M35 Cobalt HSS (≈5% Co)
Tip geometry: 135° split point (self-centering)
Flutes: Fully ground twist, optimized for chip evacuation
Shank: Straight round, 3-jaw chuck compatible
Finish: Bright ground; black oxide or black-and-gold options available
Recommended use: Ferrous & non-ferrous metals; use lubricant/coolant for stainless & thick stock
Speed & feed guidance (rule-of-thumb)
Mild steel: ~15–25 m/min surface speed (reduce for larger diameters)
Stainless: ~8–12 m/min with cutting oil; peck drill to control heat
Aluminum/brass: ~60–90 m/min; light oil optional
Index case: Heavy-duty metal box with size-stamped wells
Retail & bulk: Shrink-sleeved case for retail; master cartons for distributors
OEM options: Private label, custom assortments (metric/imperial mix), custom finish, barcode + bilingual labels (EN/RU)
Q1. Will these drill stainless steel?
Yes—M35 cobalt and a 135° split point are made for stainless. Use lower RPM and cutting oil for best life.
Q2. Are they impact-driver compatible?
These have round shanks for 3-jaw chucks. For hex/impact use, ask about our hex-shank SKUs.
Q3. Can I resharpen them?
Absolutely. M35 grinds cleanly; keep the split-point geometry when regrinding.
Q4. What if I need other sizes or step increments?
We support custom assortments and full fractional or metric maps for OEM/wholesale.
Q5. Do you offer black & gold finish?
Yes—black oxide and black-and-gold finishes are available upon request.
Company Details
Business Type:
Manufacturer,Exporter,Trading Company
Year Established:
2018
Total Annual:
500-600
Employee Number:
135~150
Ecer Certification：
Verified Supplier
Jiangsu Xing Rui Precision Tools Co., Ltd. is a leading manufacturer of high-quality cutting tools in China, established in 2008 and located in Danyang, Jiangsu Province—a major hub for cutting tool production with convenient transportation for global logistics. Main Products We speciali... Jiangsu Xing Rui Precision Tools Co., Ltd. is a leading manufacturer of high-quality cutting tools in China, established in 2008 and located in Danyang, Jiangsu Province—a major hub for cutting tool production with convenient transportation for global logistics. Main Products We speciali...
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