# Automotive Aftermarket CNC Parts in Aluminum and Stainless

Category: Automotive & Motorcycle Parts
URL: https://www.machined-parts-factory.com/products/automotive-motorcycle-parts/automotive-aftermarket-cnc-parts-in-aluminum-and-stainless/

This is a one-stop CNC service for automotive aftermarket parts in aluminum, stainless steel, brass and alloy steel. Parts are milled and turned on 3-, 4- and 5-axis centers, then brushed, anodized, powder coated or plated. It suits aftermarket brands, tuners and distributors who need non-standard performance or replacement parts made consistently batch after batch.

- 3-, 4- and 5-axis machining for billet parts
- Critical features held down to ±0.005 mm
- Brushed, anodized, powder coated or plated
- Fixed programs for consistent repeat batches

## Specifications
| Spec | Value |
|---|---|
| Process | 3-, 4- and 5-axis CNC milling, CNC turning |
| Materials | Aluminum 6061/7075, stainless steel 304/316, brass, alloy steel |
| Surface Finish | Brushing, anodizing, powder coating, electroplating, laser marking |
| Standard | Non-standard parts to customer drawing |
| Tolerance | ±0.05 mm standard; down to ±0.005 mm on critical features |
| MOQ | 1 piece; prototypes through mid-volume runs |
| Drawing Formats | STEP, IGES, X_T, STL, DWG, DXF, PDF |
| Lead Time | Prototypes typically 3–7 working days; production usually 10–20 |
| Inspection | FAI, in-process checks, 100% critical dimensions; CMM |

## How we make it
Aftermarket parts often combine cosmetic and functional surfaces, so programs separate the two: functional bores, threads and sealing faces are finished first to tolerance, then visible surfaces get finishing passes with fresh tools for an even look. 5-axis machines handle billet parts such as intake components and shift housings, while turned parts like fittings and adapters run on CNC lathes.

Billet 6061 and 7075 aluminum dominate performance parts because they anodize well in black, red or blue. Stainless 304 is used for exhaust fittings and exposed hardware, brass for fuel and fluid parts. Brushing before anodizing gives a fine directional texture; powder coating covers rougher or larger parts. Electroplating, including nickel and chrome, gives a bright finish on steel or brass.

Critical dimensions such as sealing faces, bores and thread fits are inspected on every part before shipment, supported by CMM and roughness testing. Batch-to-batch consistency comes from fixed programs, fixtures and documented first-article approval. Common parts are oil filter adapters, intake flanges, throttle body spacers, shift knobs, pedal pads, coolant fittings and sensor bungs.

## FAQ
### Can you make billet aftermarket parts with a cosmetic finish?
Yes. Visible surfaces are cut with finishing tools and strategies that minimize tool marks, then brushed, bead blasted or polished before anodizing. Fixturing is planned to avoid clamp marks on cosmetic faces. Tell us which faces are cosmetic and any reference sample for the target finish.

### How do you keep repeat aftermarket orders consistent?
We store the approved CNC programs, fixture designs and first-article report for each part number. Repeat orders run on the same setups and are checked against the same report. Anodizing color is matched to retained samples. Any change in material lot or finish supplier is reviewed before the run starts.

### How do I get a quote for automotive aftermarket cnc parts in aluminum and stainless?
Send a 3D model (STEP or IGES) and a 2D drawing with tolerances, material, finish and quantity through the quote form or by email. An engineer replies within 24 hours on business days with price, lead time and any DFM suggestions.

Request a quote: https://www.machined-parts-factory.com/contact/#rfq — inquiry@machined-parts-factory.com — WhatsApp +86 176 2154 1688