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 service and marine machinery reverse engineering in detail.
Who Gets Quotes From Us?
Common scenarios where marine engineers, yards and boatbuilders contact EKINSUN instead of a standard supplier.
// Vessel Maintenance Engineer
"Our propeller shaft is worn and the OEM part is on 16 weeks — the vessel can't wait"
Send us the worn shaft or drawings. We machine a replacement in 316L or naval brass, match the keyway, thread and taper geometry, and ship within 2–4 weeks. Many marine parts are standard enough to machine without a drawing — we quote within 24 hours from photos.
// Naval Architect / Refit Yard
"I need through-hull fittings to a non-standard bore — nothing off the shelf fits this hull"
Custom through-hulls, seacocks and sea strainer housings in naval brass C46400 or 316L, to any thread standard (BSP, NPT, metric) and flange dimension. Send us the drawing or sketch. We machine and supply, MOQ 1.
// Boatbuilder / Marine Chandler
"I need 20 sets of custom stainless deck hardware — no one stocks this profile"
Small-batch deck hardware, cleats, port rings, instrument fittings and structural brackets in 316L or 6061 marine aluminium. We machine from your drawing or dimensions. Lead time 3–5 weeks for batches of 20–200 pcs.
// Offshore Equipment Manufacturer
"Building deck winch controls — need hydraulic valve bodies in 4140, 50 pcs with 3.1 certs"
Hydraulic valve bodies, manifold blocks and actuator housings for offshore winches and deck machinery. Alloy steel, 316L or duplex stainless. EN 10204 3.1 material certificates and inspection reports supplied. MOQ 10 pcs.
What Marine Buyers Search For
custom propeller shaft manufacturer China
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stainless rudder pintle manufacturer
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custom deck fitting manufacturer
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silicon bronze propeller shaft custom
custom stern tube liner manufacturer
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// Related services
316L Stainless Machining
The material standard for marine wetted surfaces and structure.
Material guide →