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Si3n4 Impact Resistant Silicon Nitride Ceramic Bar Spot Weilding Dowel Plunger Supplier. Exceptional Hardness: Hardness reaches HRA90 and Vickers Hardness over 1550 HV0.5. Customized Weight: Weight is fully customizable to meet specific application requirements. OEM/ODM Services: Full OEM and ODM services available for custom ceramic parts. High Compressive Strength: Compressive strength up to 2500 MPa for heavy-duty industrial applications. Low Density Material: Density above 3.2 g/cm3, offering lightweight yet robust performance. Fast Delivery: Lead time as short as 10 days for stock items. Wide Application Range: Suitable for welding shafts, electronic substrates, plunger, and nozzle.