Custom parts · Drawing-led review · Global project supportsales@seiyuint.com
Precision manufacturing in China

Parts that match the drawing—and the job behind it.

CNC milling, turning and coordinated finishing for engineers who need clear DFM feedback, controlled requirements and production-ready custom parts.

STEP + PDFPreferred RFQ packagePrototype → repeatProcess planned for the volumeWorldwideDrawing-led project support
Part center

Start with the geometry.

Like a useful product catalogue, these families help you find the closest manufacturing route. Every order remains custom and is reviewed against your files.

Representative applications

From functional prototype to repeat build.

Browse typical geometry families—not stock products. Dimensions, tolerances, material, finish and inspection are defined by your drawing.

Milled housingsPockets, ports, sealing faces
Turned partsDiameters, bores, threads
FixturesDatum-driven tooling plates
ManifoldsIntersecting passages and ports
View all part families
Core capabilities

A clear route through manufacturing.

The strongest supplier pages make process selection easy. Our version connects each process to geometry, design limits and the files needed to quote responsibly.

M

CNC milling

For prismatic parts, pockets, hole patterns, planar datums and multi-face geometry.

Explore milling →
T

CNC turning

For concentric diameters, shoulders, bores, grooves and threaded rotational parts.

Explore turning →
F

Surface finishing

Anodizing, blasting, coating and plating requirements coordinated with final dimensions.

Compare finishes →
P

Prototype to production

Process choices evolve with quantity, revision maturity, inspection and repeat-order needs.

Plan the production path →
D

DFM support

Practical feedback on tool access, radii, thin walls, tolerances and finish allowances.

Open the DFM guide →
Application sectors

Different industries, different risks.

We organize requirements around function—alignment, sealing, wear, appearance, cleanliness and traceability—rather than making unsupported industry claims.

Quality is a plan

Measure what controls function.

Inspection begins with the drawing: critical dimensions, datum relationships, threads, surface requirements and the documents your team needs.

Drawing reviewRequirements before cutting
In-process checksRisk-based verification
Final recordsAs agreed for the order
See the quality workflow
How projects move

Four decisions, kept visible.

Share files

Send STEP/STP, PDF drawing, quantity, material and destination.

Review DFM

Clarify geometry, tolerances, finish, inspection and manufacturing risk.

Approve route

Confirm scope, revision, commercial terms and the agreed production plan.

Build & verify

Machine, finish, inspect and package to the confirmed requirements.

Engineering library

Useful before you request a quote.

View all resources
GUIDE / 01

Milling vs turning

Choose the process from the part's dominant geometry and feature relationships.

Read guide →
GUIDE / 02

Speeds and feeds

Understand RPM, cutting speed, chip load and why tables are starting points.

Read guide →
GUIDE / 03

Aluminum anodizing

Plan color, masking, dimensional allowance and cosmetic expectations.

Read guide →

Turn a drawing into a clear manufacturing conversation.

Request a quote