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 | ||
Purpose-built for shops that drill metal every day, the XRTOOLS 21-piece M35 cobalt set pairs hot-hard M35 HSS-Co (~5% Co) with a 135° split-point and fully ground flutes to keep holes straight, chips moving, and cycle times down. The black & gold finish helps manage friction and makes edge wear easy to see, while a steel index box protects and organizes the whole kit.
1.Process integrity: Blanks are normalized, CNC flute-ground, and vacuum heat-treated before finish grinding for consistent hardness and runout.
2.Edge that lasts: M35 retains hardness at temperature—ideal for stainless, carbon & alloy steels and cast iron—so you sharpen less and drill more.
3.Fast, clean starts: The 135° split-point self-centers, reduces thrust, and cuts down on walk even on curved or coated surfaces.
4.Real chip control: Fully ground, polished flutes evacuate chips smoothly; margin relief lowers friction on the hole wall for a better finish.
5.Ready for work: Jobber length, round shank fits any 3-jaw chuck (corded, cordless, press). Labeled metal case speeds size selection and inventory.
Fabrication & frames: Brackets, channels, angle, base plates.
Electrical/HVAC: Panel work, pilot holes for knockouts, enclosures.
Automotive/MRO: Mounting, upfit holes, fastener prep, stainless trim.
General shop: Fixtures, guards, jigs, and small batch production.
For thick austenitic stainless, use cutting oil, lower RPM, and peck to control heat.
Feature | Detail |
|---|---|
Substrate | M35 HSS-Co (~5% cobalt), fully ground |
Point | 135° split-point, web-thinned (self-centering) |
Flutes | Precision-ground twist, polished for chip flow |
Finish | Black & Gold (steam-treated/oxide + polished lands) |
Length | Jobber |
Shank | Round, 3-jaw chuck compatible |
Sizes (inch) | 21 pcs: 1/16, 5/64, 3/32, 7/64, 1/8, 9/64, 5/32, 11/64, 3/16, 13/64, 7/32, 15/64, 1/4, 17/64, 9/32, 19/64, 5/16, 21/64, 11/32, 23/64, 3/8 |
Case | Heavy-duty metal index box, size callouts, snug wells |
Resharpenable | Yes—maintain split-point geometry |
1.Mild steel: 15–25 m/min surface speed; steady feed; coolant optional.
2.Stainless (304/316): 8–12 m/min with cutting oil; peck on deep holes.
3.Aluminum/brass: 60–90 m/min; light oil improves finish (optional).
1.Runout & concentricity checked 100% on sampled lots.
2.Hardness verified post-treat to M35 spec; edges micro-honed to reduce chipping.
3.Lot traceability on case label; optional EN/RU bilingual labeling for export.
1.Retail-ready steel index box (sleeved & barcoded); master cartons for distributors.
2.Private label: your logo laser-etched, custom assortments (metric/imperial), custom finish (black oxide or black-&-gold), data sheets with your brand.
Will these replace my titanium-coated HSS set?
Yes—on steel and stainless you’ll see longer life and cleaner holes versus TiN-only HSS.
Impact-driver compatible?
Round shank is for 3-jaw chucks. Ask about our hex-shank cobalt line for impact use.
Can I mix sizes (custom 21-pc map)?
Absolutely—OEM assortments and mixed metric/imperial maps are available.
How often should I resharpen?
When lip wear reaches ~0.5–1.0 mm or chip color stays dark at normal feeds. Keep the split-point geometry.
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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