Engineered for unmatched performance, hole straightness, and micro-precision surface finishes in high-value Boston industrial applications.
The Greater Boston area—ranging from the high-tech innovations along Route 128 to the advanced labs in Cambridge and defense contractors in Wilmington and Worcester—demands precision engineering at the highest level. Industries such as biotechnology, aerospace propulsion, marine engineering, robotics, and medical device manufacturing rely heavily on deep hole processing. Machining components with extreme length-to-diameter (L:D) ratios requires gun drills that maintain tight linear tolerances, minimal drift, and immaculate surface finishes.
Our deep hole gun drills are specifically optimized to meet these strenuous localized demands. Whether it is boring micro-fluidic channels for lab-on-a-chip instruments, producing surgical implants with biomedical-grade titanium, or manufacturing critical internal hydraulic pathways in heavy industrial robotics, our tools offer unmatched stability under dynamic cutting pressures. We serve as a direct-to-factory supply channel that bypasses multiple layers of distribution markups, delivering premium tool geometry and carbide grades directly to Massachusetts machine shops.
Configured for versatile CNC applications, indexable geometries, and demanding heavy-duty New England metalworking projects.
Suzhou Tier Tool Co., Ltd. was established in 2008 and is a national high-tech enterprise specializing in the design, manufacturing, and technical support of precision solid carbide cutting tools. Since its foundation, Tier Tool has been deeply committed to the precision machining industry, focusing on delivering high-performance, high-efficiency cutting solutions for hole-making and metalworking applications. Through continuous technological innovation and manufacturing excellence, the company has earned the trust of customers across a wide range of industries worldwide.
To ensure the highest levels of precision and consistency, Tier Tool has invested extensively in advanced manufacturing equipment and production technologies. The company operates multiple imported CNC tool grinding machines and precision inspection systems, enabling complete in-house capabilities from tool design and prototyping to small-batch testing and large-scale production.
Our manufacturing process is built upon strict process control and traceability standards. Every production stage is carefully monitored to ensure repeatability, quality consistency, and reliable delivery performance. Through systematic process management and standardized operating procedures, Tier Tool has established a robust manufacturing system capable of meeting the demanding requirements of modern precision machining.
Quality is the foundation of Tier Tool's long-term success. We adhere to the principle of "Quality First, Continuous Improvement", implementing rigorous quality control procedures throughout the entire production cycle. From raw material selection and incoming inspection to final product verification, every tool undergoes comprehensive quality checks to ensure it meets strict dimensional, geometrical, and performance requirements. By continuously optimizing our manufacturing and inspection processes, we deliver products that provide exceptional accuracy, reliability, and consistency in real-world machining applications. We understand that in precision manufacturing, stable quality is not only a requirement but also the key factor that determines our customers' productivity and competitiveness.
At Tier Tool, we believe that supplying cutting tools is only the beginning of our partnership with customers. Beyond delivering products, we provide comprehensive technical support and application engineering services to assist customers in optimizing their manufacturing processes. Our technical specialists work directly with customers to analyze machining conditions, recommend suitable tooling strategies, and develop solutions that maximize efficiency, reliability, and cost-effectiveness. By understanding our customers' production goals and competitive challenges, we strive to become a trusted New England manufacturing partner rather than simply a tooling vendor.
Looking ahead, Suzhou Tier Tool Co., Ltd. will continue to focus on the development of high-performance carbide cutting tools and deepen its expertise in automotive, aerospace, precision engineering, and advanced manufacturing industries. Driven by professionalism, innovation, and customer commitment, we are dedicated to creating greater value for our customers through reliable products, flexible services, and advanced manufacturing technologies. Tier Tool will continue to grow as a trusted global partner in precision cutting solutions, helping customers achieve higher productivity, better quality, and stronger competitiveness in an ever-evolving manufacturing world.
By producing at our high-tech facility in Suzhou and shipping directly via express logistics lines to Boston (Logan Airport and Port of Boston), we offer New England clients up to a 40% cost reduction without compromising Swiss grinding precision.
We use exclusively premium sub-micron and nano-grain tungsten carbide rods paired with Swiss CNC grinders. Every single deep hole gun drill undergoes Zoller 3D optical inspections to guarantee structural straightness.
We provide tailormade tip geometries, dual-diameter step gun drills, and custom kidney-shaped coolant channel designs based on client CAD blueprints, keeping transit time from design validation to New England within 10 business days.
In deep hole drilling, especially when working with critical length-to-diameter ratios exceeding 30x, the key challenge is controlling tool drift. Because gun drills are self-guiding, the geometry of the carbide tip, the pressure of the coolant, and the concentricity of the starting guide bushing are vital factors. The high-pressure coolant acts not only as a heat dissipator but also as a physical medium to flush out chips through the V-shaped flute of the tool. If chips clog, tool breakage is imminent.
Our engineering team focuses on optimizing the relief angles and coolant channel profiles of our solid carbide and brazed gun drills. By utilizing dual kidney-shaped coolant channels, we maximize oil flow rate, which in turn reduces internal friction and prevents thermal expansion of the workpiece. This translates to an incredibly predictable process, allowing Boston operators to achieve consistent tolerances down to IT7 and IT8 classes, even when machining challenging medical-grade stainless steels and aerospace superalloys.
Expert insights on process optimization, tool selection, and trouble-shooting for Boston machine shops.
Coolant pressure must be high enough to immediately evacuate chips from the cutting zone. For small diameters (e.g., under 4mm), pressures between 70 to 100 bar are required. Insufficient coolant flow causes chip re-cutting, leading to micro-chipping on the carbide tip and eventual tool failure.
Single-flute gun drills are standard for ultimate straightness and circularity. Double-flute designs are utilized when higher chip-evacuation speed and material removal rates (MRR) are prioritized, especially in non-ferrous and highly machinable materials.
By leveraging our specialized PVD coatings (like TiAlN or AlTiN) and micro-grain carbide substrates, tool life increases by 30-50% in hard-to-machine superalloys. Proper coolant filtration (down to 5-10 microns) is also paramount to maintaining cutting edge sharpess.
Yes. While dedicated gun drilling machines are ideal, universal CNC machining centers equipped with high-pressure through-spindle coolant systems can successfully run our drills by employing a short pilot drill (1.5x to 2x diameter) to guide the entry of the gun drill.
We supply full raw material mill certificates, heat-treatment logs, and optical inspection dimension sheets. We assist Boston defense supply chains by providing full material traceability records required for critical aerospace and military production programs.
Complete selection of tungsten carbide, single-flute, double-flute, and indexable deep hole drills designed for high accuracy and long tool life.
Tier Tool
