Durable Spring Pins for Vibration-Proof Fastening
Our Spring Pins (also known as Tension Pins) are the ideal solution for applications subject to high levels of vibration and shock. By design, these pins are slightly oversized for the hole they fit into; they compress during installation, exerting constant radial force against the hole wall. This ensures a permanent, secure fit without the need for additional locking mechanisms.
We supply both Slotted Spring Pins for cost-effective general fastening and Coiled Spring Pins for high-precision, heavy-duty industrial use.
- Slotted Spring Pins (DIN 1481): The most common type, featuring a single slot. Perfect for standard mechanical assembly and rigid materials.
- Coiled Spring Pins (DIN 7343): Made from multiple coils of steel, providing 360° contact. They excel in shock absorption and have a higher fatigue life than slotted pins.
| Nominal Dia. | Drill Hole Size | Shear Strength (kN) | Recommended Use |
|---|---|---|---|
| M2.0 – M3.0 | 2.0 – 3.0 mm | 2.8 – 6.4 kN | Electronics & Toys |
| M4.0 – M6.0 | 4.0 – 6.0 mm | 11.2 – 26.0 kN | Automotive Parts |
| M8.0 – M12.0 | 8.0 – 12.0 mm | 45.0 – 100.0 kN | Industrial Machinery |
| M16.0+ | 16.0 mm+ | High Capacity | Heavy Engineering |
- Automotive: Securing gear linkages, hinges, and interior components.
- Power Tools: Connecting shafts and rotating parts subject to impact.
- Agricultural Equipment: Heavy-duty pivots and latch pins.
- Furniture: Permanent joints in metal and wooden structures.
Rigorous Quality Control & Testing
To ensure every batch of Spring Pins / Dowel Pins meets international standards (ISO/DIN), we conduct comprehensive testing at our in-house lab:
1. Dimensional Inspection
Utilizing high-precision micrometers and vision measurement systems to guarantee m6/h6 tolerances.
2. Hardness Testing
Verified by Rockwell or Vickers testers to ensure HRC 42-52 (Spring Steel) or HRC 58-62 (Hardened Steel).
3. Shear Strength Test
Ensures the pins can withstand the specified kips/kN force without deformation or fracture.
4. Salt Spray Test
For zinc-plated and stainless steel pins, we perform 24h-72h tests to verify corrosion resistance.
Frequently Asked Questions (FAQ)
Q: Can Spring Pins be reused after removal?
A: While high-quality spring pins retain their elasticity, reuse is generally recommended only in non-critical applications. For structural or high-vibration safety, we recommend using a new pin to ensure maximum radial force.
Q: What is the difference between m6 and h8 tolerances for Dowel Pins?
A: m6 is an interference fit (oversized), typically used for permanent press-fit installations. h8 is a clearance or slide fit (undersized), used for parts that may need frequent disassembly.
Q: Are your pins available in custom materials like 17-4 PH or Titanium?
A: Yes! As a specialized fastener manufacturer, we can produce custom pins in various alloys based on your engineering drawings and material requirements.
Packaging & Global Delivery
We provide robust export packaging to ensure your wholesale fasteners arrive in perfect condition:
- Standard Packaging: Plastic bags (inner) + Heavy-duty cartons (outer).
- Palletizing: Non-fumigation wooden pallets for bulk sea freight.
- Labeling: Customizable labels with Part Numbers, Sizes, and Barcodes.
- Shipping: Supporting Express (DHL/FedEx), Air, and Sea Freight (FCL/LCL).
Wholesale Pricing for All Spring Pin Types
As a leading Spring Pin manufacturer, we provide massive stock in Stainless Steel 304 and Carbon Steel. Contact us today for a free sample pack and a competitive wholesale quote!
