Explore our advanced range of step composite drills, vacuum-brazed core bits, and solid carbide machining tools designed for maximum efficiency and durability.
Established in 2008, Suzhou Tier Tool Co., Ltd. is a national-level high-tech enterprise dedicated to the research, development, custom engineering, and precise manufacturing of premium solid carbide cutting tools. We specialize in designing intricate step composite drills that revolutionize standard hole-making applications across high-precision global sectors.
By integrating advanced tool geometry, state-of-the-art multi-layer coatings, and world-class raw materials, Tier Tool provides cutting edge solutions that reduce production cycle times and deliver unparalleled tool lifespan. Our commitment to innovation is supported by an in-house design and application engineering team that works closely with OEMs to develop customized tools for demanding operations in automotive, aerospace, and precision mold industries.
In modern high-speed metalworking, productivity is determined by tool cycle optimization. Step composite drills represent a major leap in machining efficiency.
Traditional machining routes often require sequential operations—spot drilling, pilot drilling, step drilling, and chamfering—which consume excessive cycle times due to repetitive tool changes. Step composite drills consolidate these processes into a single-pass tool. By engineering multiple steps, pilots, and countersinks onto a single solid carbide substrate, manufacturers can reduce cycle times by up to 60%.
This design presents significant structural advantages. Hole concentricity is dramatically improved because all diameters are concentric to the tool axis, eliminating tolerances stacking from separate operations. This is particularly crucial in safety-critical sectors like aerospace (e.g., fastener holes in fuselage structures) and automotive (e.g., engine block coolant paths and cylinder head assemblies).
Complete multi-diameter drilling, chamfering, and deburring in a single operation, eliminating secondary processing and reducing cycle times.
Designed with customized helical flute angles and web thinning to improve chip evacuation, preventing mechanical clogging and workpiece overheating.
Choose from HSS-Tin, AlTiN, or PCD-tipped (Polycrystalline Diamond) configurations to match your workpiece material and heat tolerance limits.
A comprehensive view of Suzhou Tier Tool's state-of-the-art production facility, high-precision inspection processes, and logistics capabilities.
Achieving optimal tool life requires matching the correct drill geometry with the target workpiece material. The table below lists our engineering recommendations.
| Workpiece Material | Recommended Drill Coating | Optimal Cutting Velocity (Vc) | Feed per Rev (f) | Key Machining Objective |
|---|---|---|---|---|
| CFRP (Carbon Fiber Reinforced Polymer) | PCD / Diamond Coated | 120 - 250 m/min | 0.08 - 0.20 mm/rev | Delamination Prevention & Fiber Shearing |
| Titanium Alloys (Ti-6Al-4V) | AlTiN / TiAlN Multi-layer | 35 - 75 m/min | 0.05 - 0.12 mm/rev | Heat Dissipation & Built-up Edge Suppression |
| Cast Iron (GG25 / GGG40) | Uncoated / TiN / AlCrN | 80 - 150 m/min | 0.15 - 0.35 mm/rev | Abrasive Wear Resistance & Chip Evacuation |
| Hardened Steel (< HRC 60) | Super-hard Carbide + TiSiN | 30 - 60 m/min | 0.03 - 0.10 mm/rev | Thermal Stability & High Edge Strength |
Each material behaves differently under load. For instance, composite-to-metal sandwich stacks (e.g., CFRP/Aluminum) require custom-stepped drills with dual-angle points. The pilot tip cuts the CFRP with minimal thrust force to avoid delamination, while the main step cuts the aluminum layer, ensuring consistent chip morphology.
Why Tier Tool is the partner of choice for global industrial tool supply chains.
Based in Suzhou, the center of precision manufacturing in the Yangtze River Delta, Tier Tool benefits from a highly integrated local industrial cluster. This proximity grants us direct access to high-purity micro-grain tungsten carbide rods, fast-turnaround chemical vapor deposition (CVD) coatings, and rapid logistics channels.
For global buyers, this means lead times for custom non-standard step drills are reduced to 7-10 working days (compared to 4-6 weeks for domestic European or North American toolmakers). Our raw material supply chain ensures we can handle both large-scale production runs and high-mix, low-volume custom orders with stable pricing despite raw material market volatility.
All custom configurations are logged in our central database, ensuring repeat orders are produced with exact batch-to-batch consistency.
Ensuring seamless integration of our tools into your production lines, wherever you operate.
We manufacture tools in accordance with international industrial metrics including DIN, ISO, and ANSI. Every tool shipment includes material certificates and geometric reports confirming dimensional tolerances (down to ±0.002mm).
We partner with machinery distributors and tool supply networks to offer laser marking (private labeling) and custom packaging. This allows you to integrate high-quality solid carbide drills directly into your branded tool catalogs.
Our support extends beyond tool delivery. We offer machining parameters optimization, remote troubleshooting, and feed rate configuration adjustments based on real-time workpiece wear analysis.
Answers to common questions regarding step tool geometry, coatings, and performance optimization.
Complete your tooling setups with our high-stability custom drills, spiral taps, and aerospace-grade carbide bits.
Tier Tool
