Blind rivet nuts (rivnuts, threaded inserts) create load-bearing threads in sheet, tube and profile from one side only – the only option where the back of the part is unreachable. Helefastener’s family spans flat head, reduced head and countersunk heads; knurled or plain round bodies; open and closed ends, in steel with Cr3+ zinc finishes and stainless steel, with threads M3–M16.

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• FH-KB flat head knurled body – the workhorse type: see the FH-KB rivet nut specification
• Closed-end bodies – seal against dust and moisture
• CSK heads – countersunk for flush cosmetic faces

Before specifying, read how grip range and hole size decide rivet nut failures – most field problems trace back to those two numbers.