Most marine parts that need reproducing are old, discontinued, or from a builder that no longer exists — so there is no drawing and no CAD file. That is the normal starting point for us, not a problem. Send the worn part itself, photos with a few measurements, or even a hand sketch and we measure, redraw and machine it in the correct corrosion-grade material. No CAD required, and for genuinely obsolete components a part number is not needed either.
Marine Parts We Reproduce Most Often
- Propeller shaft components — shaft keys, taper sleeves, shaft nuts, locking collars
- Cutlass bearing housings — stern tube bore, carrier flanges, water inlet provisions
- Stern gland and shaft seal carriers — internal bore, seal groove, flange bolt pattern
- Deck fittings — cleats, fairleads, stanchion bases, custom hardware in 316L
- Rudder pintles and gudgeons — taper, pin diameter, strap width reproduced
- Seacocks and through-hull fittings — body, bonnet and handle in bronze or stainless
- Engine room brackets and mounts — engine bed brackets, gearbox mounts, exhaust supports
- Impellers for bilge and raw-water pumps — see pump parts RE
Material Selection for the Marine Environment
| Application | Material | Why |
|---|---|---|
| Deck hardware, fastenings | 316L stainless | Standard marine grade; resists atmospheric and immersion corrosion |
| Propulsion components, seacocks | Naval brass / HTB1 bronze | Dezincification resistant; traditional marine bronze equivalent |
| Highly loaded fittings, seawater service | Duplex 2205 | Higher strength than 316; superior chloride resistance |
| Extreme chemical or crevice conditions | Super duplex 2507 | PREN >40; suits aggressive marine environments |
| Bearings, bushings, guides | HDPE or Delrin | Self-lubricating, water-resistant, light |
| Cutlass bearings | Nitrile rubber / brass carrier | Reproduced to original interference and bore diameter |
Haul-out deadline. Tell us when the vessel goes back in the water — we work back from that date. A single CNC-machined part in 316L stainless is typically 5–10 working days after approval. We confirm the timeline honestly before you commit.
How We Reproduce a Marine Part With No Drawings
A worn marine component is rarely a clean copy job. Salt water erodes sealing faces, cavitation pits bronze, and a seized shaft can distort a housing. Copying the part as-is would just reproduce the wear. Instead we measure what survives, then restore the geometry to its original engineering intent — the job the OEM drawing would have done if it still existed.
- 3D scanning for complex form — impeller vanes, cast manifold bodies, propeller hubs and worn contours are captured as a dense point cloud, the fastest way to record organic marine geometry.
- CMM for the features that matter — bores, shaft tapers, seal grooves, flange bolt patterns and thread forms are probed to ±0.01 mm. A scan mesh alone is not a manufacturing definition; the critical fits are gauged, not estimated.
- Engineering judgement on worn or missing features — where a surface is eroded or a dimension is unmeasurable, we reconstruct it from the mating part, the bearing or seal fit, or the standard the original followed (ISO shaft taper, metric / BSP thread, standard seal size).
- First-article inspection — the first piece is measured back against the new drawing and, where possible, test-fitted on the vessel before any batch is run.
What to send us. Any one of these is enough to start: the old part (worn is fine), clear photos with a caliper or tape measure in shot, a hand sketch with the key dimensions, or a sample to copy. No drawing, no CAD and no part number needed — see order from a sketch and reverse engineering without a drawing.
Process
Send photos and the worn part
Include the marine environment: salt water, fresh water, brackish. This determines whether we reproduce in 316L or recommend an upgrade to duplex.
CMM measurement
All bore diameters, shaft interfaces, flange patterns, seal grooves and corrosion-critical surfaces measured to ±0.01 mm.
CAD and material specification
Drawing to your approval with material grade specified. Electropolish or passivation noted where applicable.
Machine, passivate, ship
Stainless parts passivated post-machining. Bronze and brass components deburred and inspected. Shipped with CMM report.
Marine Parts We Have Made
Recent marine reverse engineering — sailing yachts, fishing vessels, workboats and offshore equipment:
Frequently Asked Questions
316L stainless, 304 stainless, naval brass / HTB1 bronze, phosphor bronze, duplex 2205, super duplex 2507, Hastelloy C276 for aggressive environments, HDPE and PTFE for bearing and seal applications.
Yes — propeller shaft seal carriers, cutlass bearing housings, stern gland components and shaft brackets are commonly reproduced items. We measure bore, OD, face run-out, seal groove geometry, and water inlet/drain provisions from the original.
A quote in 24 hours. Production for a single machined component in 316 stainless: typically 5–10 working days after approval. Express turnaround is available — tell us your haul-out deadline and we assess whether we can hit it.
Yes. Phosphor bronze and naval brass (HTB1) are standard materials for propulsion components. We machine shaft keys, taper sleeves, locking nuts, cutlass bearing carriers and custom stern tube fittings in these materials.
Yes — that is the normal case for marine work. The worn part, a sample, or photos with a few measurements are all we need. We measure it, produce the drawing for your approval, then machine it. You never have to supply CAD.
For simpler parts, yes. A clear photo with a caliper or ruler in shot, or a hand sketch with the key diameters, threads and lengths marked, is enough to quote and often enough to manufacture. Critical fits (bores, tapers, seal grooves) are best confirmed against the physical part if you can post it to us.
Marine Part Quote
316L, bronze, duplex. Reply in 24h.
// Qty & price
1 pc
Sample price
Confirm fit before a run
3–10
Unit price drops
Setup cost shared
10+
Best price
All tiers quoted upfront
- →No distributor — you pay the maker directly
- →CAD saved after first order — reorder anytime at lower unit price
support@ekinsun.ltd
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