Marine Machining and Manufacturing Services

Greno Industries provides marine machining and manufacturing services for naval, commercial, and industrial vessels. We understand how saltwater corrosion, continuous vibration, extreme loads, and mission-critical reliability requirements place extraordinary demands on marine components.

Our experience includes machining stainless steels, bronzes, nickel alloys, and high-strength steels used in maritime environments. Greno’s precision machining capabilities ensure that components perform reliably in propulsion systems, fluid systems, structural assemblies, and onboard mechanical equipment.

Our GIS valve, installed on more than 400 U.S. Navy ships, reflects our ability to meet demanding marine and defense requirements. 

Greno supports the marine sector with CNC milling, large-diameter turning, gun drilling, welding, assembly, and kitting and packaging services. We are AS9100D and ISO9001:2015 certified and ITAR registered.

Precision Machined Marine Components

Marine vessels depend on rugged, precisely machined components that maintain alignment, sealing integrity, and structural strength under harsh operating conditions. Greno manufactures components used throughout propulsion systems, steering systems, deck equipment, fluid systems, and structural assemblies.

Whether for U.S. Navy vessels, Coast Guard cutters, commercial ships, or offshore support vessels, our components are designed for durability, corrosion resistance, and long-term performance.

Propulsion System Components

Propulsion systems are among the marine industry’s most demanding applications because their parts must withstand high torque, continuous rotation, and corrosive seawater exposure. Greno machines components for shafting, propeller hubs, and stern tube and bearing housings. They’re ideal candidates for our in-house, Made in USA manufacturing capabilities.

Shafting Components

  • Propeller shafts

  • Intermediate shafts

  • Tail shafts

  • Coupling flanges

  • Keyed hubs and collars

These components require long, straight, high‑accuracy turning. That makes them a great match for Greno’s large‑format turning capabilities.

Propeller Hubs and Components

  • Hub bodies

  • Blade retaining hardware

  • Pitch control components (for controllable‑pitch propellers)

These parts often require multi‑face CNC milling, deep bores, and precision sealing surfaces.

 Stern Tube and Bearing Housings

  • Stern tube liners

  • Bearing carriers

  • Seal housings

Greno machines these components to tight tolerances to ensure proper alignment and prevent water ingress.

Steering and Maneuvering System Components

The steering systems on Navy and civilian vessels rely heavily on machined metal parts. That’s why Greno manufactures:

  • Rudder Stocks and Rudder Posts: Large‑diameter, high‑strength shafts machined from stainless steel or high‑strength alloys.

  • Tiller Arms and Linkage Components: Precision‑milled arms, brackets, and connection points that transfer steering force.

  • Hydraulic Steering System Components: Cylinder housings, valve blocks, mounting brackets, and piston rods

Often, these steering and maneuvering components require deep hole drilling, precision boring, and smooth sealing surfaces.

Deck Machinery and Handling Equipment

Deck equipment must withstand shock loads, saltwater exposure, and heavy mechanical forces. Greno machines winch and windlass components, crane and davit hardware, and mooring and anchoring components. They often require large part turning, multi-axis machining, and fabrication.

Winch and Windlass Components

  • Drum shafts

  • Gear housings

  • Brake components

  • Bearing blocks

Crane and Davit Hardware

  • Sheaves and pulleys

  • Pivot pins

  • Structural brackets

  • Mounting plates

Mooring and Anchoring Components

  • Chain stoppers

  • Swivel housings

  • Anchor handling hardware

Pump, Valve, and Fluid System Components

Marine vessels depend on fluid systems for cooling, ballast, firefighting, fuel transfer, and hydraulics. Greno machines the following types of components for these systems.

  • Pump Housings and Impellers: Machined from stainless steel, bronze, or nickel alloys for corrosion resistance.

  • Valve Bodies and Flanges: Precision‑machined sealing surfaces and deep bores for high‑pressure systems.

  • Manifolds and Flow Blocks: Our in-house gun drilling creates internal passages that are both long and straight.

  • Heat Exchanger End Caps and Tube Sheets: Critical for cooling systems on both military and commercial vessels.

Structural and Hull‑Related Components

Structural and hull-related components require precision machining for alignment, fit, and load transfer. Greno machines keel and frame components, bulkhead and deck penetration hardware, and mounting bases and foundations for engines, generators, pumps, and other equipment. These parts must maintain dimensional accuracy to ensure proper alignment across the vessel.

Keel and Frame Components

  • Machined brackets

  • Gussets

  •  Load‑bearing plates

Bulkhead and Deck Penetration Hardware

  • Precision‑machined collars

  • Flanges

  • Sealing rings

Weapons, Radar, and Mission System Components

Naval vessels require specialized components for combat and mission systems. Greno machines parts for radar and sensor mounts, weapons systems hardware, and shock-rated applications.

  • Radar and Sensor Mounts: Precision‑milled brackets and housings for stabilized platforms.

  • Weapons System Hardware: Mounting plates, structural supports, and alignment blocks

  • Shock‑Rated Components: Machined from high‑strength alloys to meet MIL‑SPEC shock and vibration requirements.

Greno’s experience with defense‑grade materials and tolerances makes it a strong partner for naval contractors – and we hold a Woman Owned Small Business (WOSB) certification.

Engine Room and Mechanical System Components

Marine engine rooms contain machined parts that must withstand heat, vibration, and corrosive fluids. Greno machines components for engines and generators, gearboxes and transmissions, and HVAC and refrigeration systems. Often, these parts require multi‑axis CNC milling and precision turning.

Engine and Generator Components

  • Brackets

  • Covers

  • Housings

  • Shafts

Gearbox and Transmission Components

  • Bearing carriers

  • Gear housings

  • Alignment pins

HVAC and Refrigeration Components

  • Compressor housings

  • Valve blocks

  • Mounting hardware

How Greno’s Capabilities Support Marine Manufacturing

Marine machining and manufacturing needs to support durability, corrosion resistance, and precision. Greno’s machining capabilities align directly with these requirements.

CNC Milling for Complex Marine Components

Marine parts such as pump housings, valve bodies, brackets, and structural components require multi‑face machining and tight tolerances. Greno provides 3-axis and 4-axis CNC milling with precision pocketing and contouring, and flatness and parallelism control. Plus, we specialize in machining marine metals like 316 stainless steel, which is highly resistant to saltwater corrosion.  

Large‑Diameter Turning for Shafts, Hubs, and Cylindrical Components

The marine propulsion and steering systems on naval and commercial vessels use large, heavy, cylindrical components. These parts require accuracy over long lengths – one of our core strengths. At our Scotia, New York (USA) manufacturing facility, Greno uses large diameter turning with:  

  • Propeller shafts

  • Rudder stocks

  • Bearing housings

  • Couplings and flanges

  • Large rings and collars

Gun Drilling for Deep, Straight Bores

Marine fluid systems need deep internal passages. In fact, they’re essential for pump housings, valve bodies, and hydraulic components.

Greno’s gun drilling capabilities support:

  • Deep bores up to 60 inches

  • Straight, high‑accuracy internal channels

  • Multi‑port manifolds

  • High‑pressure coolant drilling

Fabrication, Welding, and Assembly

Marine components can require more than precision machining. That’s why Greno also provides industrial welding for frames and brackets, fabricated housings, industrial assemblies, and kitting and packaging services for shipyards and OEM product lines. These value-added services allow our customers to receive complete, ready-to-install assemblies.

A Trusted Partner With Greno for Marine Machining and Manufacturing

Greno Industries combines precision machining, material expertise, and disciplined quality processes to deliver marine components that perform reliably in harsh environments. Our ability to machine complex parts and provide integrated manufacturing solutions makes us a trusted partner for naval, commercial, and industrial marine applications. 

Contact Greno Industries for marine machining or manufacturing services, or to learn more about our capabilities. 

Industries Served
Industries Served