304 Stainless Steel Flat Head Rivet Nut Blind Semi-Hex Insert Nutsert M3–M12

304 Stainless Steel Flat Head Rivet Nut — Blind Semi-Hex Insert Nutsert M3–M12

304 stainless steel flat head blind rivet nuts (rivnuts / nutserts) create a permanent, load-bearing threaded insert in thin sheet metal, aluminium extrusions, and composite panels from one side only — no rear access required. The semi-hex body provides anti-rotation performance to prevent spinning during bolt installation, while the flat head sits flush with the panel surface for a clean, low-profile assembly.

Key Specifications

Why Choose 304 SS Flat Head Rivet Nuts?

• 304 stainless steel — corrosion-resistant for electronics enclosures, outdoor equipment, and humid environments; superior to carbon steel rivnuts
• Flat head (flush) — sits flush with panel surface; no protruding collar; clean, low-profile assembly
• Semi-hex body — anti-rotation geometry prevents spinning during bolt installation without adhesive
• Blind installation — installs from one side only; no rear access required for thin panels, hollow sections, or closed profiles
• M3–M12 range — covers electronics (M3–M6) through structural sheet metal assembly (M8–M12)

Typical Applications

• Electronics enclosure and instrument panel threaded insert (aluminium, steel sheet)
• Aluminium extrusion frame threaded insert for M3–M12 bolts
• Outdoor electrical enclosure and weatherproof junction box assembly
• Robotics chassis and CNC machine frame sheet metal fastening
• HVAC ductwork and sheet metal panel assembly
• Composite panel and GRP (fibreglass) fastening

Compatible With

• Standard rivet nut tools / rivnut guns (M3–M12 mandrel sets)
• Pneumatic and hydraulic rivnut installation tools
• Sheet materials: aluminium, mild steel, stainless steel, GRP, HDPE (min. 0.5mm)
• Mating bolts: ISO 4762 hex socket cap screws, DIN 933 hex bolts M3–M12

Package Contents

• 304 SS flat head rivet nuts in selected size and quantity (per variant)
• Note: rivet nut installation tool sold separately

Frequently Asked Questions

Q: What is the difference between 304 and 316 stainless steel rivet nuts?

A: 304 (A2) stainless steel is suitable for indoor electronics, general mechanical use, and moderate outdoor exposure. 316 (A4) stainless steel adds molybdenum for superior resistance to chloride pitting and crevice corrosion in marine, coastal, and chemical environments. Choose 316 for saltwater or aggressive chemical exposure.

Q: What does semi-hex body mean?

A: A semi-hex body has a partially hexagonal cross-section that provides anti-rotation grip in the drilled hole. When the rivet nut is installed, the hex geometry bites into the hole wall, preventing the nut from spinning when a bolt is tightened into it.

Q: What sheet thickness can these be installed in?

A: Grip range varies by size: M3 typically grips 0.5–3.0mm; M6 grips 0.5–3.5mm; M12 grips 1.0–4.0mm. Check the specific variant datasheet for exact grip range before ordering.