Qingdao Sande Technology Co., LTD
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Precision CNC Machined Stainless Steel U-Pins - Flat Head Grooved Clamping Pins
Product Overview
Our high-precision stainless steel U-pins are CNC machined for secure clamping, alignment, and fastening in demanding industrial applications. Featuring a flat head design and grooved ends, these pins provide excellent retention, vibration resistance, and easy installation in machinery, automotive, and assembly systems.
Key Features & Benefits
✔ Premium Material
Stainless Steel 304/316 – Corrosion-resistant, high strength, and durability
Optional 17-4PH (Precipitation Hardened) for extreme wear resistance
✔ Precision CNC Machining
Tolerances: ±0.01mm (Standard) | ±0.005mm (High Precision)
Grooved Ends – Ensures secure retention with snap rings or clips
Flat Head Design – Prevents rotation and provides a flush surface
✔ Dimensions & Customization
Diameter: 3mm–25mm
Pin Length: 10mm–150mm
U-Bend Radius: Customizable
Surface Finish: Ra 0.4μm–1.6μm (Mirror Polish Available)
✔ Secondary Processing
Passivation – Enhanced corrosion resistance
Electropolishing – Smooth, burr-free finish
Laser Marking – Part numbers, logos, or batch codes
✔ Quality Assurance
100% Dimensional Inspection (CMM, Optical Comparators)
Hardness Testing – HRC 28-55 (Depending on Material)
Salt Spray Test – 500+ Hours (ASTM B117)
Precision CNC Machined Stainless Steel U-Pins - Technical Specifications
| Parameter | Specification | Testing Standard |
|---|---|---|
| Material | 304/316 Stainless Steel (17-4PH optional) | ASTM A276 |
| Hardness | 304: HRB 70-90 316: HRB 80-95 17-4PH: HRC 28-40 |
ASTM E18 |
| Diameter Range | 3mm-25mm (±0.01mm) | ISO 286-2 |
| Pin Length | 10mm-150mm (±0.05mm) | |
| U-Bend Radius | 1.5×D to 3×D (Customizable) | |
| Groove Dimensions | Width: 1mm-3mm Depth: 0.5mm-1.5mm |
|
| Surface Finish | Standard: Ra 0.8μm Mirror Polish: Ra 0.4μm |
ISO 1302 |
| Straightness | ≤0.02mm/100mm | ISO 1101 |
| Load Capacity | Shear Strength: 400-600MPa | ISO 6892-1 |
| Corrosion Resistance | 500h salt spray (standard) | ASTM B117 |
| Temperature Range | -50°C to +400°C | |
| Certifications | ISO 9001, RoHS | |
| Secondary Processes | Passivation, Electropolishing, Laser Marking | |
| MOQ | 100pcs (Standard Sizes) 1pc (Prototypes) |
|
| Lead Time | Samples: 5 days Production: 10-15 days |
Applications
Automotive – Suspension bushings, linkage retention
Industrial Machinery – Shaft alignment, pivot pins
Aerospace – Lightweight fastening solutions
Electronics – Panel mounting, connector retention
Why Choose Our U-Pins?
✅ High Wear Resistance – Long-lasting performance in harsh conditions
✅ Secure Retention – Grooved ends prevent accidental dislodging
✅ Customizable – Tailored dimensions & materials for your needs
✅ Fast Turnaround – Prototypes in 5 days | Production in 15–40days