We machine Cnc Machined Automotive Parts Components for drivetrain housings, sensor brackets, and valve bodies. You get ±0.005 mm positional tolerance, 0.008 mm runout on critical bores, and 58 HRC ha
We machine Cnc Machined Automotive Parts Components for drivetrain housings, sensor brackets, and valve bodies. You get ±0.005 mm positional tolerance, 0.008 mm runout on critical bores, and 58 HRC hardness on wear surfaces. Typical lead time is 7 days for prototypes, 15 days for production runs, and we ship from our Dongguan factory with 20 years of precision manufacturing experience.
We run 12 Fanuc-controlled machining centers, including two 5-axis DMG MORI units. All machines sit on epoxy-grouted foundations, which kills vibration drift. We probe every fixture before the first cut, and we re-probe after every 50 parts to catch thermal expansion. This is how we hold ±0.005 mm on aluminum and ±0.008 mm on stainless steel. If your current parts fail at 0.02 mm, you will see the difference in fit and noise.
We machine 6061-T6 and 7075-T6 aluminum for lightweight brackets. For steering knuckles and suspension links, we use 4140 chromoly steel, heat-treated to 28-32 HRC. If you need wear resistance, we offer 8620 case-hardened steel to 58-62 HRC. We also cut 304 and 316L stainless for exhaust flanges and sensor housings. Every material lot comes with a mill certificate, and we verify hardness on every batch with a Rockwell tester.
Automotive pulleys, spindles, and motor shafts cannot tolerate wobble. We machine these in a single clamping operation on our 5-axis mills, which eliminates re-fixturing errors. Then we check TIR (total indicated runout) on a Talyrond roundness tester. We guarantee 0.005 mm TIR on diameters under 50 mm, and 0.01 mm on larger parts. If you have ever replaced a bearing early due to vibration, this is the fix.
We cut with high-pressure coolant at 80 bar to prevent built-up edge, which leaves a clean 0.8 Ra finish on aluminum and 1.6 Ra on steel. For sealing surfaces, we can polish to 0.4 Ra. We break every sharp edge with a 0.2 mm radius unless your drawing specifies otherwise. This prevents stress risers that crack under cyclic loads. We also deburr internal cross-holes with a flow-through abrasive process, so no loose chips ever reach your assembly line.
We do not ship parts without a full inspection report. Our Zeiss CMM checks all critical dimensions, and our optical comparator verifies thread forms and small radii. We include a material certificate, hardness report, and surface finish trace with every box. If you need PPAP Level 3, we produce it for automotive Tier 1 and Tier 2 customers. We keep records for 10 years, so you can trace any part back to its raw material heat.
Tool wear is the number one cause of out-of-spec dimensions in automotive parts. We use coated carbide inserts for steel and PCD tools for high-volume aluminum runs. For deep pockets and thin walls, we adjust feed rates dynamically to avoid deflection. If you are designing a new part, read our CNC cutting tool selection guide to avoid costly tool changes. For tight fits, our CNC machining tolerances guide explains what we can hold on different features.
We are a made-in-China factory, but we price like a local machine shop. Our hourly rate is $45, and we quote per part based on cycle time plus setup. There is no MOQ — you can order 1 prototype or 50,000 units. For production, we offer blanket orders with scheduled releases. We ship via DHL or FedEx for prototypes (3-5 days to USA), and by sea freight for bulk orders. We handle export documentation, and we can mark parts with your part number and heat code via laser etching.
| Specification | Value |
|---|---|
| Machining Tolerance | ±0.005 mm (aluminum), ±0.008 mm (steel) |
| Runout (TIR) | 0.005 mm on Ø < 50 mm, 0.01 mm on larger |
| Surface Finish | 0.8 Ra standard, 0.4 Ra polished |
| Materials | 6061-T6, 7075-T6, 4140, 8620, 304/316L |
| Hardness (Heat Treated) | 28-32 HRC (4140), 58-62 HRC (8620 case-hardened) |
| Max Part Size | 800 mm x 400 mm x 400 mm |
| Lead Time | 7 days prototype, 15 days production |
| MOQ | No MOQ (1 piece accepted) |
| Inspection | Zeiss CMM, optical comparator, Rockwell hardness |
| Certification | PPAP Level 3, material certs, ISO 9001:2015 |
No MOQ. We machine one prototype for validation, then scale to your production volume.
Yes, we swap materials and adjust heat treatment cycles based on your load and environment requirements.
We use SPC with in-process probing every 50 parts and a final CMM inspection on 100% of critical dimensions.
We can ship a prototype in 72 hours if you provide a solid model and material spec.
Send your drawing for a firm quote within 12 hours. Email sc@bquq.com or WhatsApp +86 13713157787. We will review your tolerances, suggest cost reductions, and confirm a delivery date.
| Parameter | Capability |
|---|---|
| Materials | AL6061/7075, SUS303/304/316, 45# steel, T2 copper, H59 brass, POM, PEEK, nylon |
| Tolerance | ±0.005mm standard, ±0.003mm on request |
| Machines | 3/4/5-axis CNC, turn-mill, Swiss lathe |
| Surface | Anodizing, nickel, zinc, passivation, sandblast, polish |
| Size Range | Max 400 x 300 x 200 mm |
| Prototype | 72 hours, no MOQ on samples |
| Inspection | Full report per batch, CMM data on request |
