Engineered for maximum rigidity, zero bell-mouthing, and reamer-free surface finishes (Ra < 0.4 µm) in difficult-to-machine materials like Hardox, Stainless Steel 316L, and Aircraft-Grade Titanium.
Designed for heavy-duty CNC machining centers in Chile's mining pump manufacturing sector. Offers exceptional vibration dampening and rapid chip removal.
Features a 135° split point and double-margin guidance effect for handheld pneumatic and radial drills. Prevents work-hardening in Chilean stainless steel fabrication.
Ultra-fine micrograin carbide geometry ideal for aerospace MRO component repair and electronic enclosure drilling in Santiago industrial parks.
Standard jobber length double-margin configuration providing extreme rigidity and straightness in deep-hole metal drilling applications.
Engineered with secondary margin lands to eliminate drill drift during deep hole drilling (up to 50XD) in heavy copper mining machinery parts.
High-pressure coolant channel combined with four margin burnishing edges delivers instant chip flushing and flawless hole cylindricality.
Optimized core thickness and double margin guide land tailored for 304, 316, and duplex stainless steels used in Chilean pulp & paper mills.
Heavy-duty core drill countersink for multi-stage hole chamfering and deburring in aircraft skin structures and structural steel plates.
In high-demanding machining sectors across Chile—ranging from copper extraction equipment maintenance in Antofagasta to military aircraft maintenance (ENAER) in Santiago—hole quality and dimensional accuracy are non-negotiable. Traditional two-flute twist drills possess a single margin land per flute located at the leading edge. While effective for soft metals and short hole depths, single margin drills frequently suffer from chatter, bell-mouthing, and axial deflection when penetrating hard alloys or stacked materials.
Double Margin Geometry Explained: A double margin drill incorporates a primary guidance margin at the cutting edge and a secondary trailing margin located behind the flute. As the cutting point advances into the metal, the secondary margin contacts the freshly machined wall of the hole. This creates a four-point bearing support contact network inside the bore. The structural stabilization effectively neutralizes radial cutting forces, preventing tool whip and vibration.
China high-precision double margin drills are specifically optimized to meet the rugged, demanding operational environments across Chile's key industrial hubs:
Drilling tough, work-hardening metals such as Hardox 400/500 plate, high-manganese steel jaw crusher plates, and 316L slurry pump housings without tool chipping or work hardening.
NAS 965 Type D threaded shank drills and double margin jobber drills for aircraft wing spar repairs, sheet metal riveting, and precision engine bracket reconditioning under strict AS9100 standards.
Deep-hole internal coolant double margin drills for machining high-pressure hydraulic manifolds, paper roller cores, and marine stainless steel fittings exposed to severe corrosive environments.
Below is a comparative performance evaluation conducted on 316L Stainless Steel and Hardox 450 mining wear plates under standardized CNC milling conditions (Vc = 75 m/min, Fn = 0.12 mm/rev):
| Performance Indicator | Standard 2-Flute HSS Drill | Standard Carbide Drill (Single Margin) | Our Double Margin Carbide Drill |
|---|---|---|---|
| Hole Size Accuracy | IT11 – IT12 (Requires Reaming) | IT9 – IT10 (Slight Bell-Mouth) | IT7 – IT8 (Reamer-Free H7 Fit) |
| Surface Roughness (Ra) | 3.2 – 6.3 µm | 1.6 – 3.2 µm | 0.4 – 0.8 µm (Burnished Finish) |
| Drill Straightness (Runout / 100mm) | > 0.15 mm | 0.08 – 0.12 mm | < 0.02 mm (Zero Deflection) |
| Tool Life in Hardox 450 | Baseline (100 Holes) | 2.5X (250 Holes) | 6.8X (680 Holes) |
| Process Step Savings | Drill + Center + Ream (3 Steps) | Drill + Ream (2 Steps) | One-Shot Direct Hole (1 Step) |
Combining world-class Swiss/German CNC grinding technology with high-grade micrograin carbide substrates to deliver unmatched reliability for Chilean importers and distributors.
We source 100% virgin tungsten carbide rods with ultra-fine grain sizes (0.4 µm - 0.6 µm) and 10%-12% Cobalt content, ensuring exceptional transverse rupture strength (TRS > 4,000 MPa) against impact loads.
Manufactured on state-of-the-art Walter Helitronic and Rollomatic 5-axis CNC grinding machines. Every double margin profile is computer-modeled for optimum rake angle, flute clearance, and edge radius balance.
Every batch undergoes automated 3D optical measurement via Zoller Genius inspection systems. We guarantee diameter tolerances down to ±0.002 mm, zero radial runout, and 100% coating adhesion test compliance.
We provide full official Certificate of Origin (Form F / TLC Chile-China) documentation. Chilean buyers benefit from 0% import customs duties, direct sea freight to Valparaíso/San Antonio, and rapid air express to Santiago.
Need specialized NAS 965 threaded shank adapter drills, piloted step drills, or custom outer diameter double margins? Our engineering team delivers tailored CAD drawings within 24 hours.
Built according to aerospace standards including NAS 907, NAS 937, NAS 938, and NAS 965 Type D, making our tools directly interchangeable with NATO/US military maintenance protocols.
Answers to common questions regarding customs, technical selection, feeds & speeds, and ordering logistics for Chilean CNC workshops and industrial distributors.
Contact our engineering sales team for wholesale price lists, technical CAD customization, and free sample testing for your CNC manufacturing plant or tool distribution network in Chile.