# CNC Turned Knurled Aluminum Car Interior Knob

Category: Custom Metal Knobs
URL: https://www.machined-parts-factory.com/products/custom-metal-knobs/cnc-turned-knurled-aluminum-car-interior-knob/

This is a knurled aluminum knob for car interiors, used on climate controls, infotainment dials, light switches and aftermarket shift levers. It is CNC turned from 6061 aluminum, sometimes with a molded-in brass insert for threads, then anodized or brushed. It is made for automotive interior suppliers and tuning brands replacing plastic knobs with real metal ones.

- Bores matched to original switch shafts
- Diamond-cut face ring for a bright accent
- Brass molding inserts for threaded interfaces
- Black, brushed or color anodized finishes

## Specifications
| Spec | Value |
|---|---|
| Process | CNC turning, knurling, diamond cutting, insert machining |
| Materials | Aluminum 6061; brass inserts; stainless steel 304 |
| Tolerance | ±0.05 mm standard; down to ±0.005 mm on critical features |
| Surface Finish | Anodizing, brushing, diamond cutting, laser engraving |
| Inserts | Brass molding or press-fit inserts |
| MOQ | 1 piece; prototypes through mid-volume |
| Drawing Formats | STEP, IGES, X_T, STL, DWG, DXF, PDF |
| Lead Time | Prototypes typically 3–7 working days; production 10–20 |
| Inspection | First-article, in-process and CMM checks; reports on request |

## How we make it
Car knobs must fit existing switch shafts exactly, so we start from the original part or the switch specification and machine the bore to match. The outer profile and knurl are turned, and the front face can be diamond cut for a bright ring. Where a plastic interface is needed, we machine brass inserts that are molded or pressed into the knob for a secure, rattle-free fit.

6061 aluminum offers a cool, premium touch and a durable anodize. Brushed or diamond-cut finishes match modern interiors, while black anodize suits sport trims. Brass molding inserts provide strong threads and conduct heat less abruptly than steel. For shift knobs, heavier brass or stainless steel bodies add inertia for a smoother shift feel.

Bore fit is tested on the target shaft, knurl and finish are inspected for consistency, and any engraved icons are checked for position. Critical features are measured on every knob. Typical uses include air-conditioning control knobs, audio volume and tuning dials, headlight switches, seat heater knobs and aftermarket shift knobs.

## FAQ
### Can you replace a plastic car knob with an aluminum version?
Yes. Send the original knob or the switch shaft details, and we machine an aluminum knob with a matching bore and similar outer size. Where the shaft is plastic or splined, we may add a brass or plastic insert to ensure a secure fit.

### What is a brass molding insert?
It is a small turned brass part with knurls or grooves that is molded into or pressed into a plastic or metal knob. It provides a strong thread or shaft interface that holds better than threads cut directly into plastic, improving durability.

### How do I get a quote for cnc turned knurled aluminum car interior knob?
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