Send your drawing for a no‑obligation review. Transparent pricing, usually within 24 hours.
Get a Quote!Since 2008, Maxwell Wang and David Liu have built Parts4world on a simple principle: give engineers a custom-machined parts manufacturing partner that delivers quality without surprises. Our team’s DFM depth, combined with modern CNC machining and Swiss screw machine products capabilities, helps you cut precision part cost, improve performance, and meet every deadline. Today, 98% on-time delivery rate, an average 20% cost saving through DFM, and over 300 international clients trust us with their custom parts.
Projects Delivered On Time
DFM Engineers Ready to Help
Free Quotes & DFM Reviews
Days of Continuous Reliability
Active Global Satisfied Clients
We built our entire process around three things that matter most to your bottom line: design support, transparent costs, and no-risk delivery.
Our QC system catches variation early, using CMM, 2D vision, and profilometers throughout the run — not just final inspection. We follow ANSI/ASQ Z1.4, so your CpK stays on target and your receiving inspection stays clean. The result: less than 0.3% customer rejection rate over the past three years.
During the machined parts production process, random sampling identifies tool wear immediately. We correct offsets in real time, avoiding batch-wide defects. It’s the difference between proactive control and reactive firefighting. That means your incoming QC workload drops significantly — often to a simple dimensional spot-check.
Every order gets a full dimensional report — your precision part’s “birth certificate” — before crating. We synchronize inspection with production for complex precision components assemblies, ensuring both speed and accuracy. If a custom machined parts doesn’t match your print, it doesn’t leave our floor.
P4W was recommended by a colleague — and they did not disappoint. Highly skilled engineers, modern equipment, and the surface finish matched our domestic benchmarks. Our go-to supplier for custom-machined parts in China.
Tight tolerance and a ruthless deadline on a stainless CNC turning parts project. Bill and the team delivered on time, on budget, with perfect communication. A true partner, not just a vendor.
Aluminium CNC turned parts and screw machine products arrived ahead of schedule. Our customer was thrilled with the quality and on-time delivery. Great teamwork, Parts4World!
Aluminum – CNC Turning Parts
Brass – Screw Machine Products
Stainless Steel – CNC Machining
Brass – Screw Machine Products
Steel – Custom Machined Parts
Brass – CNC Turning Parts
Here are the answers we provide to most new customers before they even ask:
Started with a vision of engineering‑led transparency. Built a core team of precision machining experts.
Opened our first dedicated precision machining facility, quickly earning trust from North American and European clients with fast‑turn prototypes.
Added advanced CNC milling and turning capacity to meet growing demand for complex, high-tolerance components.