Blind rivet GESIPA 6300979 aluminum body, steel mandrel 5×18 mm, for 12–14 mm flat head

Blind rivet GESIPA 6300979 has an aluminum body and a steel mandrel sized 5×18 mm. Designed to form a 12–14 mm flat head after installation, this blind rivet provides a permanent blind-side fastening where access is available from one side only. It is suitable for joining thin metal sheets, panels and light constructions and is commonly used in metalworking, HVAC, automotive repair and general assembly tasks.

Advantages

The combination of an aluminum body and a steel mandrel delivers a balance of corrosion resistance and strong clamping force. The 5×18 mm mandrel dimension ensures consistent setting behavior, while the resulting 12–14 mm flat head provides a broad bearing surface that reduces material pull-through. As a blind rivet, it enables secure fastening from one side without the need for access to the rear side of the assembly, simplifying installation in confined or complex structures.

Suitable for

• Joining thin metal sheets and panels
• Light structural assemblies and frames
• HVAC installations and ductwork
• Automotive bodywork repairs and trim fastening
• General mechanical assembly where one-sided access is required

Key specifications

• Body material: aluminum
• Mandrel material: steel
• Mandrel size: 5 × 18 mm
• Finished head type: flat head, 12–14 mm
• Application type: blind rivet for one-sided fastening
• Typical use: thin sheet metal and light constructions

How to use

Prepare the workpieces and drill a hole matching the rivet diameter. Insert the blind rivet through the aligned holes so the aluminum body passes through the materials and the mandrel protrudes from the installation side. Using an appropriate blind rivet tool, grip the mandrel and apply steady pulling force until the mandrel breaks off and the rivet body deforms to create the blind-side bulge and the 12–14 mm flat head. Verify that the head sits flush and the joint is firm; remove any remaining mandrel stub if necessary.

Recommendations

Select a rivet diameter and hole size that match the thickness and material of the workpieces to ensure proper clamping and avoid deformation. Use a rivet tool rated for 5 mm mandrels and follow manufacturer guidance for installation force. For applications exposed to corrosive environments, consider material compatibility between the aluminum body, steel mandrel and the joined materials to reduce galvanic corrosion risk.