Propeller Shaft & Drive Shaft — Brass & Steel
Precision shafts machined from stainless steel and naval brass for marine propulsion. Keyway, thread and taper features to customer specification.
// Reference Parts
Workshop & product library photos
These images show the type of work EKINSUN can quote from drawings, samples, photos, rough sketches, or existing parts.
Long Precision Stainless Shaft — Marine Grade
316L stainless steel long shaft machined to close tolerance. Common for propeller shafts, rudder stocks and pump shafts in marine installations.
Hydraulic Valve Body — Marine & Offshore
Precision-machined hydraulic valve body for marine hydraulic systems — steering, deck equipment, thruster controls.
Naval Brass Threaded Fitting — Custom
Custom brass (naval brass C46400 or C36000) threaded fittings to BSP, NPT or metric standards. Through-hulls, seacocks and deck fittings.
Stainless Threaded Coupling Batch
Batch-produced 316L stainless threaded couplings. Common for pipe joining in bilge systems, fuel lines and seawater cooling.
Stainless Sensor & Instrument Fittings
Miniature 316L stainless sensor fittings and adapters for marine instrumentation — depth transducers, temperature sensors, flow meters.
Deep Hole Drill Precision Shafts
Deep-hole drilled shafts for marine hydraulic cylinders, steering rams and rudder posts. Precision-bored to hydraulic rod tolerance.
Brass Marine Fittings Assortment
Assortment of custom brass marine fittings — BSP, NPT, JIC, metric; used for seawater systems, fuel, oil and hydraulics.
Keyway Shaft Batch — Marine Drive
Precision keyway shafts for marine drive trains and deck machinery. Common material: 316L stainless or 17-4 PH for seawater resistance.
CNC Machined Parts for Marine & Offshore Applications
Marine environments impose a specific and demanding set of requirements: continuous seawater exposure, mechanical loading from seas and propulsion, vibration from engines and propellers, and a need for long service life between maintenance intervals. The standard engineering materials — mild steel, zinc-plated carbon steel, standard aluminium — fail rapidly in these conditions. Marine-grade CNC machining requires the right material selection from the outset.
Materials We Use for Marine Parts
- 316L Stainless Steel — the standard marine structural and wetted-surface material; excellent pitting and crevice corrosion resistance in seawater.
- Naval Brass (C46400) — copper-zinc-tin alloy specifically developed for seawater service; used for through-hulls, seacocks, fittings and propellers.
- Titanium (Grade 2 CP) — the best corrosion resistance of any machined metal in seawater; used for keel bolts, propeller shafts and highly loaded fasteners where weight also matters.
- Bronze (C93200 / C95400) — bearing bronze and aluminium bronze for propeller hubs, rudder bearings and bushings subject to wear and seawater.
Common Marine CNC Part Requests
- Propeller shafts and stern tube liners — threaded, tapered, keyway as required
- Seacocks and through-hull fittings — BSP and NPT threaded, in naval brass or 316L
- Deck hardware and cleats — anodized aluminium or stainless machined fitments
- Hydraulic steering and thruster valve bodies — produced from stainless or alloy steel bar
- Instrument and sensor fittings — pressure transducer ports, depth sensor housings
- Rudder pintles and gudgeons — precision-bored to tight bearing fits in bronze or stainless
- Replacement and obsolete marine parts — many legacy marine fitting and fastener part numbers have been discontinued; we reproduce from worn samples, photos, or partial drawings
No CAD required. Many marine replacement parts arrive without drawings — the part was made decades ago, the manufacturer is out of business, and the only reference is the worn or corroded original. We reverse-engineer the geometry from the sample and machine the reproduction in the correct marine-grade material. See our replacement parts and reverse engineering services.
// Related services
316L Stainless Machining
The material standard for marine wetted surfaces and structure.
Material guide →