When You Need Precision, Not a Catalogue Part
Standard ranges stop where your application gets demanding. The fitting you need has to seal cleanly, resist the medium and hold tolerance in a place a generic part can't — a low-pressure analytical line, a medical fluidic manifold, a sensor port, an instrument that was built around a part no one sells anymore. EKINSUN closes that gap by machining precision fittings and custom fluid connectors to your exact spec, in the material your application demands, from one piece upward.
This page is for precision and low volume. If you mainly need to convert between thread standards, see thread adapters (BSP/NPT/metric); for high-pressure power lines, see hydraulic adapters. For everything else fluid- and connection-related, the adapters & fittings hub is the place to start.
Built for Critical, Low-Volume Applications
The work we see most isn't mass production — it's the part that has to be correct for a system that matters:
Medical fluidics
Custom fluid connectors with burr-free threads and inert flow paths in 316L, PEEK or PTFE.
Lab & analytical
Clean-bore fittings and unions for instrumentation, chromatography and test rigs.
Sensors & instruments
Sealing ports and adapters that hold tolerance around pressure, temperature and flow sensors.
Hydraulics & pneumatics
One-off and small-batch precision fittings for repair, retrofit and prototype rigs.
Obsolete components
Discontinued precision fittings reproduced from a sample so old equipment keeps running.
Wherever chemical inertness, a contamination-free bore and tight, repeatable threads decide whether the part works, machining — not casting or moulding — is the right process, and there's no tooling cost standing between you and a single piece.
Technical Capabilities at a Glance
The standards, materials and tolerances we machine precision fittings to:
| Thread Standards & Types | Machinable Materials | Precision & Custom Capability |
|---|---|---|
| NPT / NPTF (tapered pipe) Metric M (ISO coarse & fine) BSPP / BSPT (G & R) UNF / UNC (unified) JIC / ORFS / SAE JIS standard threads |
Stainless: 304, 316, 316L Brass / copper: C36000 & alloys Aluminium: 6061-T6, 7075 Titanium alloys Plastics: PEEK, PTFE, POM |
Tolerances down to ±0.005 mm (±0.0002") Surface finish Ra 0.8 to Ra 0.4 Thread fit classes 2A/2B, 3A/3B Volume: low-volume / small batch, 1 to 10,000+ pcs |
Build Your Fitting Spec — Instant RFQ
Configure a non-standard fitting against our CNC capabilities below. It generates clean RFQ text you can copy, or send straight to our engineers — no account, no CAD file.
Precision Fitting Spec Configurator
Define both interfaces, material and batch size. We reply with lead time and pricing within 24 hours.
Custom fitting configuration…
Materials for Precision Fittings
316 / 316L Stainless
The default for fluidics, marine, chemical and food-grade lines — corrosion-resistant, weldable, clean.
316 machining →PEEK & PTFE
Chemically inert engineering plastics for medical and lab fluidics where metal isn't suitable.
Ask about PEEK/PTFE →Brass, titanium & aluminium
Brass for general fluid/air, titanium for biocompatibility and corrosion, aluminium where weight matters.
More materials →From One Prototype to a Small Batch
Because these fittings are CNC-turned and milled rather than tooled, there is no mould or die cost — so a single proof piece costs the same per-part logic as a run of fifty. Prove the fit with one, then scale to a batch. See how our low-MOQ custom parts service works, and how to order with no CAD file.
No Drawing? We Reverse Engineer It
Send the part or the interfaces
The old fitting, both mating parts, or the two interfaces to connect — even a worn or broken sample.
We measure & draw it
Threads, seals, bore and form captured; we rebuild the CAD for free. How it works →
Confirm, then machine
You approve the drawing, then we turn, mill and inspect it. Copy from a sample →
What to Send Us
- The sample fitting, or both parts it must connect — or photos with one known dimension
- The interface on each end if you know it (e.g. 1/4" NPT to M12×1.5, or a tube/barb size)
- Medium, pressure, temperature and any cleanliness or biocompatibility requirement
- Material or certification needs (e.g. 316L, PEEK, FDA-grade)
- Quantity — one to prove the fit, or a small batch — and delivery country
No CAD, no problem. Rebuilding the drawing is our job — free, and confirmed with you before anything is cut. See how to order with no CAD file.
A note on branded parts. We make a compatible fitting to the original's form, fit and function from what you supply. We don't sell branded original products or imply affiliation with the original manufacturer.
Frequently Asked Questions
Yes — low volume is what we're built for. Because these are CNC-machined rather than cast or moulded, there's no tooling cost, so a single prototype or a small batch is welcome. Tell us the quantity and we quote accordingly, with no strict MOQ.
Yes. We machine custom fluid connectors in 316L stainless, PEEK and PTFE with burr-free threads and clean bores for laboratory, analytical and medical fluidics, where chemical inertness and a contamination-free flow path matter. Tell us the medium, pressure and any cleanliness or certification you need.
Tolerances down to ±0.005 mm (±0.0002"), surface finishes from Ra 0.8 to Ra 0.4, and thread fit classes 2A/2B and 3A/3B. For sealing fittings we machine the correct seal feature — taper, cone, flat or O-ring boss — on each end.
304, 316 and 316L stainless; brass and copper alloys; aluminium 6061-T6 and 7075; titanium; and engineering plastics including PEEK, PTFE and POM — chosen for pressure, fluid, chemical exposure and cleanliness.
Yes. Send the part — even worn or broken — and we measure the threads, bore, sealing faces and form, rebuild the drawing for free, confirm it, then machine a compatible replacement. No drawing or part number needed.
No. A sample, the two interfaces to connect, a dimensioned photo or a sketch is enough — we rebuild the CAD for free and confirm it with you before any metal is cut.
Get a Precision Fitting Quoted
A sample or the two interfaces — that's all we need. Engineers reply in 24h.