Silicon Nitride Positioning Pins / Ceramic Dowel Pins for Projection Welding
Silicon Nitride Ceramic Component
SKU: FWM/SN-PIN-001
- Material
- Silicon Nitride (Si₃N₄) – High-density / Gas Pressure Sintered
- Size
- Standard sizes available (M4–M12 and custom). Custom dimensions supported.
- MOQ
- 5 pieces per type
- Applications
- Automotive
Silicon Nitride Positioning Pins (also known as ceramic dowel pins or locating pins) are precision components designed for accurate positioning of weld nuts and studs in projection welding and resistance welding fixtures.
Send drawing or required dimensions (nut size, guide diameter, overall length, head style) for feasibility review and quotation. Supports prototype and series production.
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Product Description
Review representative product forms and application context below. Final geometry and acceptance criteria are confirmed from the drawing and operating conditions.
Silicon Nitride Positioning Pins (also known as ceramic dowel pins or locating pins) are precision components designed for accurate positioning of weld nuts and studs in projection welding and resistance welding fixtures.
Made from high-performance silicon nitride ceramics, these pins provide electrical insulation, exceptional wear resistance, high fracture toughness and excellent thermal shock resistance. They prevent unwanted current flow and sparks between the pin and workpiece, eliminate weld spatter adhesion, and maintain precise positioning over long production cycles. Compared with steel or conventional metal pins, Si₃N₄ pins typically offer 5–10 times longer service life, higher welding quality and reduced downtime.
Manufacturing process (source record): High-purity Si₃N₄ powder → forming → high-temperature / gas pressure sintering → precision grinding and polishing to tight tolerances → final inspection.
Quality control (source record): Dimensional inspection, surface finish check, concentricity verification and batch traceability.
Data status: the source record is not supplier-verified. Numerical values are typical engineering references, not guaranteed product specifications; final values require grade, drawing and test-basis confirmation.
Product Features
- Electrical insulation — prevents sparks and unwanted current
- No weld spatter adhesion — cleaner process, less post-weld cleaning
- Superior wear resistance and high fracture toughness
- Excellent thermal shock resistance and high-temperature stability (up to 1200 °C)
- High dimensional stability under repeated thermal and mechanical loads
- Non-magnetic and chemically stable
- Significantly longer service life than steel or KCF pins
Typical Applications
- Projection welding of nuts to sheet metal (automotive and general metal forming)
- Resistance welding fixtures and automated nut welding stations
- Precise locating of weld nuts, studs and small metal components
- High-cycle production lines requiring consistent positioning accuracy
Technical Data
| Property | Unit | Typical Value |
|---|---|---|
| Density | g/cm³ | ≥ 3.20 |
| Apparent porosity | % | 0 – 0.2 |
| Young’s Modulus | GPa | 300 – 320 |
| Flexural Strength @25°C | MPa | > 720 – 900 |
| Compressive Strength @25°C | MPa | > 1500 – 2200 |
| Fracture Toughness | MPa·m¹/² | 6.2 – 9.0 |
| Vickers Hardness | GPa / HV | 15 – 16 GPa / ≈1500 HV |
| Poisson’s Ratio | — | 0.25 – 0.26 |
| Thermal Expansion Coefficient | ×10⁻⁶/°C | 3.0 – 3.3 |
| Thermal Conductivity @25°C | W/(m·K) | 15 – 25 |
| Max. Working Temperature | °C | 1200 |
| Electrical Resistivity @25°C | Ω·cm | > 10¹⁴ |
| Dielectric Strength | kV/mm | ≈ 16 |
Typical reference values for material selection only. Final specifications are confirmed against drawing, grade and operating conditions. Values are typical reference data and may vary with grade, geometry and test method. Final specifications confirmed against drawing and operating conditions.
Available Forms
Representative forms are shown for selection. Send drawing or required dimensions (nut size, guide diameter, overall length, head style) for feasibility review and quotation. Supports prototype and series production.
- Round head and pointed head designs
- Standard nut sizes: M4, M5, M6, M8, M10, M12 and imperial equivalents
- Custom guide diameter, shoulder geometry, nose profile and mounting length
Packaging & Shipping
Packing and shipment arrangements are selected for the confirmed component geometry and order requirements.
| Item | Details |
|---|---|
| Packaging & shipping | Individually protected, cushioned and packed in export cartons. Terms confirmed in the quotation. |
About FreeWill Material
FreeWill Material supplies technical ceramic components for demanding industrial applications. Our product range includes silicon carbide, silicon nitride, alumina, zirconia and other engineered ceramic materials.
We work with qualified manufacturing resources in China to support material selection, drawing-based customization, production coordination, inspection documentation and export delivery. Component feasibility, tolerances and material grades are reviewed according to the customer's drawings and operating conditions.
Our focus is to provide international buyers with clear technical communication, practical sourcing support and responsive quotation service for custom ceramic components.
- Drawing-Based Customization
- Material Selection Support
- Inspection Documentation
- Export Coordination