Two Ways Buyers Use Us
Nearly every order that reaches a custom parts manufacturer is one of two jobs. Knowing which one is yours tells you exactly what to send:
Manufacture a part from your design
You have a drawing, a CAD model, or just an idea with dimensions. We review it for manufacturability, suggest the material and tolerances that fit the job, and machine it — prototype first if you want to check fit before a batch.
Replicate a worn or discontinued part
The OEM is gone, quotes months, or never sold the part separately. Send the physical part — even broken — or photos with measurements. We reverse-engineer the geometry, match or upgrade the material, and make it again.
What Buyers Actually Send Us
These are real order inputs, exactly as they arrived. No CAD, no title block — a ballpoint sketch with the dimensions that matter. Both parts were machined from these pages after we returned a formal drawing for approval:
The rule: if the part's function is clear and the critical dimensions are on the page, we can manufacture from it. Our engineers do the CAD work — you check the drawing we send back, and nothing is cut until you approve it. How ordering without CAD works →
From Your Message to a Delivered Part
Send what you have
Drawing, sketch, photos or the sample by mail — plus quantity, material preference (or the job description) and where it ships.
Engineering review & quote — within 24h
We check manufacturability, flag anything unclear, suggest material and tolerances, and quote 1 / 10 / 50 quantity tiers so you see the price curve.
Production drawing for your approval
Sketch and sample orders get a dimensioned drawing back before anything is cut. You confirm it — this is the step that prevents surprises.
Machining
CNC turning, milling and EDM for metal and engineering plastics; vacuum casting for small-batch plastic and silicone parts. Simple parts ship in 7–12 working days.
Inspection & shipping
Dimensional check against the approved drawing; reports and EN 10204 3.1 material certificates on request. Express shipping worldwide, 3–7 days.
Reorders from file
Your drawing stays on file. The next batch skips engineering and setup discussion — and usually costs less per piece.
Capabilities and Materials
| Capability | What it covers |
|---|---|
| CNC turning | Round and threaded parts — adapters, bushings, shafts, fasteners — to ±0.01 mm on critical diameters |
| CNC milling | Brackets, plates, housings, hole patterns and prismatic features to ±0.02 mm |
| EDM | Sharp internal corners, hardened materials, fine features cutting tools can't reach |
| 3D scanning | Digitizing complex samples for reverse engineering and replacement work |
| Vacuum casting | Small batches of plastic and silicone parts from one silicone mold — 5 to 100 pieces |
Metals: 6061 and 7075 aluminum, 303/304/316L stainless steel, 12L14 and C45 carbon steel, 42CrMo4 alloy steel, C360 brass, bronze, Grade 5 titanium — the full selection guide is on the custom metal parts page. Plastics and elastomers: POM, PEEK and cast polyurethanes, plus silicone in industrial and medical grades.
Factory-Direct vs. a Manufacturing Marketplace
Search for a custom parts manufacturer and half the results are marketplaces — platforms that take your order and route it to a factory you never meet. That model has its place at volume, but for one-offs, replacements and small batches the differences matter:
| Marketplace / platform | Factory-direct (EKINSUN) | |
|---|---|---|
| Who you talk to | An account layer between you and the shop | The engineer responsible for machining your part |
| No-CAD orders | Most require an uploadable CAD model to quote | Sketches, photos and samples are normal inputs |
| Price structure | Factory price plus platform margin | Maker's price — the quote is the factory's own |
| Changes & questions | Relayed through the platform | Answered in one step, same person |
| Reorders | May land at a different shop each time | Same file, same machines, same inspector |
Who Orders From Us
- Maintenance engineers replacing worn and obsolete machine parts the OEM no longer supplies — discontinued parts are a specialty
- Equipment builders and OEMs outsourcing small-batch machined components with inspection paperwork
- Product developers moving from a sketch or prototype to first articles and pilot runs — OEM/ODM support included
- Workshops and rebuilders who need one correct part — the right thread, the right fit — without a distributor minimum
Recent work is documented in the case studies, including parts made from nothing more than a hand drawing.
Frequently Asked Questions
No. Roughly half our orders arrive as sketches, photos or samples. We produce the drawing, you approve it, then we machine — and the file stays available for reorders.
One piece for machined parts — no mold, no die, no tooling charge. Vacuum-cast plastic and silicone parts are economical from about 5–10 pieces per mold.
Yes — send the part (worn or broken is fine) or photos with measurements. We reverse-engineer it, confirm the drawing and material with you, and make it again.
Quote in under 24h. Simple parts ship in 7–12 working days, complex or certified work in 2–3 weeks, plus 3–7 days express shipping worldwide.
ISO 9001:2015 system, inspection against the approved drawing on every order, and dimensional reports, 3.1 material certificates and hardness testing on request.
No platform margin, no relay layer: the engineer who quotes is the one who makes the part. Changes are faster, reorders land on the same machines, and sketches are welcome.
Start With What You Have
Drawing, sketch, photo or sample. Engineers reply in 24h.
// Qty & price
1 pc
Sample price
Confirm fit before a run
10+
Unit price drops
Setup cost shared
50+
Best price
All tiers quoted upfront
- →No platform margin — you pay the maker directly
- →CAD saved after first order — reorder anytime at lower unit price