| Tolerance Type | Description |
| Precision Tolerance | Parts are manufactured and inspected strictly according to your drawing specifications and GD&T annotations, with a minimum tolerance of ±0.05 mm. |
| General Tolerance | ±0.05 mm |
| Minimum Feature Size | 0.5 mm. The exact minimum feature size may vary depending on the part geometry and selected material. |
| Threading & Tapped Holes | Capable of machining any standard thread sizes, as well as customized thread specifications. |
| Edge Condition | Sharp edges are deburred and chamfered by default. |
| Surface Finishing | Anodizing, Powder Coating, Spray Painting, Laser Engraving, Silk Screen Printing |
| Minimum Wall Thickness | 0.5mm |
| Minimum End Mill Size | 0.5mm |
| Minimum Drill Hole Size | 1mm |
| Minimum Part Size | CNC Milling: 5 × 5 × 5 mm; CNC Turning: 2 × 2 mm; |
| Maximum Part Size | CNC Milling: 4000 × 1500 × 600 mm
CNC Turning: 200 × 500 mm |
A volume knob is the one control your customer touches every single day — and the first thing reviewers photograph. Our turning program treats it as both a precision component and a brand statement.
What we turn for audio brands: volume and source-select knobs; push-on/push-off shaft adapters with D-cuts and flats; set-screw or splined hubs; weighted-bottom variants for that premium heft; full custom silhouettes from your ID sketch.
Texture is engineering: knurl (straight, diamond or custom pitch), CD striation or brushed radial patterns are cut on-machine, not molded — so grip never fades and batch-to-batch texture stays identical. Pattern depth is dialed for bare-finger comfort over thousands of rotations.
Finishing that survives fingers: anodize in silver, black, champagne or custom PMS; two-tone options where the knurl stays bright against a colored body; laser-etched index lines and logos that stay legible after years of use.
Fit discipline: shaft bores held to your pot or encoder spec (6mm, 6.35mm, D-shaft, splined) with the set-screw seat positioned so the knob indexes dead-center on your pointer. Samples ship with fit-check reports against your shaft drawings.
Knurl and CD patterns are machined, never molded — identical grip and look across every batch.
6/6.35mm, D-flat and splined bores held to your pot spec; knobs index dead-center every time.
Bright knurl against anodized body, laser-etched indices — your look, manufactured exactly.
From aerospace-grade aluminum to medical-certified engineering plastics, our in-house CNC machining centers work a broad range of metals and plastics under one roof.
Don’t see your material? Send your drawing for review — we will confirm availability and quote it.
Functional and cosmetic finishes applied in-house or through vetted partners.
Type II protective anodize, natural silver finish.
Type III hard coat, wear-resistant black.
Blue, red, gold, green dye for audio and 3C.
Uniform matte texture, hides machining marks.
Durable corrosion-resistant RAL colors.
Removes free iron, boosts stainless corrosion.
Zinc, nickel, chrome, tin for connectors.
Permanent non-contact logos and serials.
Custom CNC turned aluminum knobs produced on precision lathes. We manufacture control knobs with CD texture, anodized finishes and custom bores for audio equipment, home appliances and industrial instruments.
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High-efficiency VMCs for prototype, mid-volume and large-batch metal parts production.
Integrated drilling, tapping and milling shortens lead time for aluminum enclosures.
Combined drilling-milling lines support both small batches and volume OEM orders.
Well-organized production zones support everything from one-off parts to mass programs.
Systematic line layout raises machining efficiency and guarantees on-time delivery.
Complete CNC equipment set enables stable continuous running for OEM volumes.
Dongguan, China · 200+ CNC machines · In-house anodizing & laser cutting · Visitors and third-party inspections welcome.
Fully certified quality management system. Every batch ships with material certificates and inspection reports you can trust.
Our engineers review every drawing upfront — flagging tolerances, undercuts and cost drivers before a single chip is cut.
Custom foam, wooden crates and FBA-ready packaging. Door-to-door freight to 60+ countries with full tracking.
Your message lands directly with our senior engineers — instantly acknowledged.
We study your requirements and propose a workable solution with material & process options.
Detailed quotation with specs, options and lead time — no hidden fees.
Approve the sample, then we mass-produce with full QC and on-time shipping.
WhatsApp: +86 13790500374
Email: info@rejincnc.com
Your CAD files are kept strictly confidential. Quotation within 24 hours.