Precision Machining Services
Greno Industries provides precision machining services for large format parts. From CNC milling to gun drilling, and from large‑diameter turning to custom fasteners, we machine metal components that are used in turbines, heavy equipment, military systems, and engineering assemblies. GE Vernova, Siemens, and the U.S. Navy are some of our customers.
At Greno, experienced machinists use advanced equipment to machine your parts in accordance with our AS9100-certified and ISO9001-certified quality management system. We are ITAR registered, hold a Woman Owned Small Business (WOSB) Certification, and are proud to machine everything that we make right here in America.
Here’s an overview of our precision machining services with links to additional information.
CNC Milling Services
Greno Industries provides 3‑axis and 4‑axis CNC milling for complex geometries, tight‑tolerance features, and production‑ready components. Our milling centers are engineered to handle a range of materials, including carbon steel, stainless steel, Inconel, titanium, and specialty alloys. Because they’re geared lower, our CNC mills are better for heavy-duty material removal.
Our capabilities include:
Precision contouring, pocketing, and profiling
Multi‑surface machining with reduced setups
Complex features requiring rotary axis positioning
High‑accuracy machining for flat, angled, and contoured surfaces
Repeatable production for both small and large batch runs
For prismatic parts, flat surfaces, and flat geometries, 3-axis milling provides exceptional accuracy. When components require machining on multiple sides or more complex angles, our 4‑axis equipment allows the part to rotate during machining, reducing manual repositioning.
Customers rely on Greno’s CNC milling services because we deliver:
Tight tolerances across complex geometries
Faster turnaround through optimized setups
Consistent quality across production runs
Material expertise for high‑performance alloys
Whether you need a prototype, a one‑off replacement part, or full production machining, Greno’s 3‑axis and 4‑axis milling capabilities ensure accuracy, repeatability, and long‑term reliability.
Large Diameter Turning Services
Greno Industries is recognized for its ability to machine large‑diameter components that many shops can’t handle. Our CNC turning centers accommodate oversized parts with a high degree of precision. We can support diameters up to 90 inches while ensuring that large components meet your dimensional, finish, and performance requirements.
Our capabilities include:
Large‑diameter turning up to substantial lengths and weights
Precision machining of shafts, rings, hubs, flanges, and cylindrical components
Tight‑tolerance OD/ID turning
Threading, grooving, facing, and contour turning
Machining of high‑strength and heat‑resistant alloys
Large diameter turning requires specialized equipment, rigid setups, and experienced machinists who understand how to maintain accuracy across long spans and heavy workpieces. Greno’s turning department is built for exactly that.
Customers rely on Greno’s CNC large diameter turning services because we deliver:
Exceptional stability and accuracy on oversized parts
The ability to machine difficult alloys without compromising tolerances
Reliable lead times for critical-path components
Decades of experience supporting turbine and industrial OEMs
When your project requires large‑format turning with no margin for error, Greno delivers the precision and reliability your application demands.
Gun Drilling Services
Greno Industries offers gun drilling services for precision machined components that need deep, accurate holes with minimal deviation. Most shops outsource this work, but we keep this form of deep hole drilling in house for exceptional accuracy and repeatability. We operate two gun drilling machines at our Scotia, New York (USA) facility.
Our capabilities include:
Deep‑hole drilling with exceptional straightness
Diameters ranging from small to large depending on application
Drilling through carbon steel, stainless steel, Inconel, and other alloys
High‑quality internal surface finishes
Precision concentricity and minimal drift over long distances
Gun drilling is essential for machined metal parts used in high‑pressure, high‑temperature, or fluid‑transfer environments. Our equipment is engineered to maintain accuracy even in long, narrow bores where conventional drilling methods fail.
Customers rely on Greno’s gun drilling services because we provide:
Deep‑hole accuracy that meets strict engineering requirements
Smooth internal finishes that improve flow and reduce wear
Reliable concentricity for mating components
The ability to drill through tough, heat‑resistant alloys
When your design requires deep, precise holes with no compromise in quality, Greno’s gun drilling services deliver the performance your application needs.
Custom Fastener Manufacturing
Greno Industries machines custom fasteners that are engineered for demanding industrial and military applications. When off‑the‑shelf hardware isn’t available or can’t meet your performance, material, or dimensional requirements, we can precision machine fasteners to your exact specifications.
Our capabilities include:
Custom bolts, studs, nuts, and specialty hardware
Precision threading (UNC, UNF, metric, ACME, and specialty forms)
High‑strength materials including stainless steel, alloy steel, Inconel, Monel, and other specialty metals
Heat‑resistant and corrosion‑resistant fasteners for extreme environments
Tight‑tolerance machining for critical assemblies
Custom fasteners are essential for equipment that operates under high loads, high temperatures, corrosive environments, or safety‑critical conditions. Greno’s precision machining ensures that every fastener meets your mechanical and dimensional requirements.
Customers rely on Greno’s custom fastener machining services because we provide:
Fasteners built to exact engineering requirements
Material traceability and quality documentation
Precision machining for perfect fit and performance
Reliable delivery for urgent or ongoing production needs
When your project requires fasteners that cannot fail, Greno delivers hardware built for strength, durability, and long‑term reliability.
Why Manufacturers Choose Greno Industries
Customers choose Greno Industries because we combine advanced machining technology with decades of industrial manufacturing experience and material expertise.
Our capabilities are supported by:
Engineering-grade precision
Advanced CNC equipment
Material expertise
Quality assurance
Six decades of experience
AS9100:2016 certification
ISO 9001:2015 certification
ITAR registration
From prototype development to production manufacturing, Greno Industries delivers precision machining services designed for reliability, repeatability, and demanding industrial performance.
Partner with Greno Industries
Whether your project requires large-format CNC machining, tight-tolerance milling, deep-hole gun drilling, or custom fastener manufacturing, Greno Industries provides the machining expertise and manufacturing support needed for mission-critical industrial applications.
Contact Greno Industries today to discuss your precision machining and manufacturing requirements.