CNC Machining Custom Knob Black Anodized Turning Milling Precision
OEM
Introducing our custom knob - add a personal touch to your home decor or machinery. Choose from a wide range of colors and design options.
minimum order
1 piece
Quantity
$3.50 - $3.50
/ piece
Introducing our custom knob - add a personal touch to your home decor or machinery. Choose from a wide range of colors and design options.
| Key Attributes | |
| Machining Capabilities | CNC Machining Processes:Broaching, Drilling, Etching/Chemical Machining, Laser Machining, Milling, Turning, Wire EDM, Rapid Prototyping |
| Materials Supported | Aluminum, Brass, Bronze, Copper, Hardened Metals, Stainless Steel, Steel Alloys, Plastic |
| Micro-Machining or Not | Micro Machining |
| Key Processes | CNC Milling, Turning, Drilling |
| Tolerance Standards | Industry-standard precision |
| Surface Treatments | Anodizing, Plasting, Polishing, etc. |
| Applications | Control Systems, Automotive Components |
| Place of Origin | Guangdong, China |
| Model Number | CUSTOM |
| Service Type | Customized OEM/ODM Manufacturing |
| Drawing Formats | PDF, CAD, IGES, STEP |
| Delivery Time | 7-30 Days |
| MOQ | 10 pcs |
· Product Overview
Introducing the YITECH Precision Trilobular Indexing Hub — a CNC-machined aluminum mechanical interface engineered for zero-backlash rotational indexing, high-torque transmission, and tool-assisted assembly in automation, robotics, medical devices, and aerospace subsystems.
This hub delivers:
- Solid 6061-T6 or 7075-T6 aluminum construction — lightweight, strong (UTS ≥ 310 MPa), non-magnetic, and thermally conductive
- Octagonal external profile (8 flats, 13 mm across flats) — allows secure wrench tightening (no slipping, no rounding)
- Trilobular internal cavity (3 symmetrical lobes, 120° spacing) — provides positive mechanical engagement with matching 3-pronged shafts for true angular zero-reference
- Matte black anodized finish (Type II, 15 μm, sealed) + optional hard coat (Type III, 25 μm) for extreme wear resistance
- Tight tolerances: ≤0.008 mm concentricity, ±0.005 mm lobe dimension — ensures repeatable 0°/120°/240° indexing under load
Unlike stamped steel couplings or plastic hubs (prone to deformation, wear, or misalignment), our indexing hub offers monolithic rigidity, zero rotational play, and verified torque capacity — even after 50,000+ indexing cycles.
Ideal for engineers building servo-driven rotary stages, collaborative robot wrists, medical imaging gimbals, or modular tooling systems where angular precision and mechanical integrity are non-negotiable.
· Core Specifications
| Parameter | Specification |
|---|---|
| Material | 6061-T6 Aluminum (standard); optional: 7075-T6 (high strength), 5052-H32 (marine), or Ti-6Al-4V (aerospace) |
| Surface Finish | Matte Black Anodize (Type II, 15 μm, hot-sealed) — UV-resistant (ΔE < 1.0 after 1,000 hrs QUV) • Optional: Hard Anodize (Type III, 25 μm, black) — for high-wear apps (wear resistance: 0.1 mg/100 cycles, ASTM G65) |
| Standard Dimensions | • Overall diameter (across flats): 28 mm (octagonal, 8 sides) • Height: 18 mm • Central trilobular cavity: 3 lobes, max width 14 mm, depth 10 mm, lobe radius 4.2 mm • Side hole: Ø2.5 mm (threaded M3 optional) • Weight: ~38 g (6061-T6, black) |
| Tolerances | • Lobe symmetry (120° spacing): ±0.01° • Concentricity (cavity center to OD): ≤ 0.008 mm TIR • Flatness: ≤ 0.005 mm • AF (across flats): 28.0 ±0.02 mm |
| Max Torque Capacity | 220 N·m (with M3 set screw + 3-prong shaft, 5 N·m preload) |
| Operating Temp. | -40°C to +150°C (anodized); up to +250°C (bare Al) |
| Compliance | RoHS, REACH, ISO 9001; IATF 16949-ready documentation |
· Application Scenarios
This trilobular hub excels where precise angular indexing, high torque transmission, and tool-assisted assembly are critical:
- Robotics & Automation
→ Wrist joint indexing hubs for cobots (3-lobe = repeatable 0°/120°/240° positions)
→ Quick-change tool interfaces (e.g., gripper ↔ screwdriver ↔ camera)
→ Rotary stage drivers with mechanical zero reference - Medical Devices
→ CT/MRI gantry rotation modules (non-magnetic 6061-T6)
→ Surgical robot instrument changers- Lab analyzer carousel hubs (color-coded lobes = assay type)
- Optics & Laser Systems
→ Mirror mount bases with indexed rotation (lobe = fixed angular stop)
→ Fiber optic rotary joints (trilobular prevents torsional drift)
→ Beam steering gimbals - Industrial Machinery
→ CNC tool magazine adapters
→ Packaging machine indexing tables
→ Printing press registration hubs - Aerospace & Defense
→ Satellite solar array drive couplings
→ UAV payload pointing mechanisms
→ Panel fasteners with mechanical lock (no springs needed)
💡 Why engineers choose YITECH trilobular hubs:
- 3-Lobe Geometry = True Zero-Backlash Indexing — no elastic deformation under load
- Octagonal Exterior = Tool-Driven Assembly — eliminates hand-tightening errors
- CNC from Billet = Zero Internal Stress — no warping after thermal cycling
- Custom in 6 days — no tooling cost, no minimum for lobe count or size
· Production Process Introduction
· Packaging and Shipping Methods
- Standard Packaging: 1 hub per anti-static PE bag; 100 per EPE tray; 1,000 per cardboard box.
- Bulk Options: 2,000–20,000+ units per pallet (custom foam inserts available).
- Shipping Methods:
- 📦 Express (DHL/FedEx/UPS): 3–7 business days (global)
- ✈️ Air Freight: 5–10 days (orders ≥ 500 pcs)
- 🚢 Sea Freight: 20–35 days (container loads)
- White-Label Services:
- Laser engraving (logo, part #, QR code)
- Branded blister packs or retail boxes
- Kitted solutions (e.g., “Indexing Kit”: 10 hubs + 3-prong shafts + torque guide)
· Frequently Asked Questions (FAQ)
Q1: What is the MOQ?
A:
A:
- Standard configuration: 200 pcs
- Custom lobe count/size/material: 500 pcs
- Samples: 5 pcs free for verified B2B customers (shipping paid)
Q2: What’s the lead time?
A:
A:
- In-stock designs: 5–7 working days
- Custom CAD/sketch: 7–10 working days (includes lobe validation & FAI)
- Rush service (≤5 days): Available for +20% fee
Q3: Can I customize the lobe count (e.g., 4-lobe or 6-lobe), change the octagon to hex, add magnets, or switch to stainless steel?
A: Yes — full customization is our core strength:
A: Yes — full customization is our core strength:
- Lobe count: 2, 3, 4, 6, or custom (e.g., asymmetric for keyway + indexing)
- External shape: Hex (6 flats), Octagon (8), or D-shape
- Features: Threaded side holes, axial slot, press-fit magnet cavity, O-ring groove
- Materials: 6061-T6 (standard), 7075-T6, 304 SS, Ti-6Al-4V
- Finishes: Black anodize, hard coat, PVD gold, or bare brushed Al
👉 Send a sketch, STEP file, or shaft spec - we’ll provide a 3D model, FEA stress report (optional), and quote within 2 hours.
Q4: Is the trilobular cavity milled or EDM’d? Can you certify indexing accuracy?
A: All cavities are CNC-milled with custom form tools (not EDM), ensuring:
A: All cavities are CNC-milled with custom form tools (not EDM), ensuring:
- Sharp, consistent lobe edges (no radius rounding)
- Perfect 120° symmetry (±0.01°)
- Optional: Indexing accuracy certificate (angular error ≤ ±0.02° at 100 N·m load)
- We guarantee zero rotational play under rated torque
Q5: Do you support medical or aerospace certifications?
A: Absolutely:
A: Absolutely:
- FDA 21 CFR 177.1010 (food/medical contact)
- IATF 16949 & AS9100 documentation available
- Cleanroom packaging (Class 10,000) for sterile applications
- ESD-safe version (surface resistivity 10⁴–10⁶ Ω/sq) per ANSI/ESD S20.20
· Why Choose YITECH?
✅ Trilobular = Zero Backlash — mechanical indexing without springs or sensors
✅ Octagonal = Tool-Driven Reliability — no hand-tightening variability
✅ Billet Machined = No Weak Points — unlike cast or stamped alternatives
✅ Fast Customization Without Compromise — no tooling fees, no minimum
✅ Octagonal = Tool-Driven Reliability — no hand-tightening variability
✅ Billet Machined = No Weak Points — unlike cast or stamped alternatives
✅ Fast Customization Without Compromise — no tooling fees, no minimum
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