316 A4-80 Marine Grade Stainless Steel Flat Head Insert Rivet Nut M3–M12

316 A4-80 Marine Grade Stainless Steel Flat Head Insert Rivet Nut M3–M12

The 316 A4-80 stainless steel flat head insert rivet nut (rivnut / nutsert) creates a permanent, load-bearing threaded insert in thin sheet metal, aluminium extrusions, and composite panels — no rear access required. Marine-grade 316 stainless steel with molybdenum addition delivers superior corrosion resistance in saltwater, outdoor, and chemically aggressive environments where standard 304 stainless is insufficient.

Key Specifications

Why Choose 316 A4-80 Rivet Nuts?

• Marine-grade 316 SS — molybdenum content resists chloride pitting and crevice corrosion; suitable for marine, coastal, and chemical plant environments
• A4-80 high strength — tensile strength 800 MPa minimum; suitable for structural and load-bearing fastening applications
• Flat head (flush) — sits flush with panel surface for clean, low-profile assemblies; no protruding collar
• 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

Typical Applications

• Marine electronics enclosures and instrument panels (saltwater environment)
• Aluminium extrusion frames (2020, 3030, 4040 profiles) — threaded insert for M3–M12 bolts
• Stainless steel sheet metal fabrication and HVAC ductwork
• Outdoor electrical enclosures and weatherproof junction boxes
• Composite panel and GRP (fibreglass) boat hull fastening
• Food processing equipment and pharmaceutical machinery (316 SS required)
• Robotics chassis and CNC machine frame assembly

Compatible With

• Standard rivet nut tools / rivnut guns (M3–M12 mandrel sets)
• Pneumatic and hydraulic rivnut installation tools
• Aluminium extrusion profiles: 2020, 3030, 4040, 4080 series
• 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

• 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: 316 (A4) stainless steel contains 2–3% molybdenum, which significantly improves resistance to chloride-induced pitting and crevice corrosion. 316 is the correct choice for marine, coastal, food processing, and chemical environments. 304 (A2) is suitable for indoor and general mechanical use.

Q: What sheet thickness can these rivet nuts be installed in?

A: Grip range varies by size: M3 rivnuts typically grip 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.

Q: Do I need a special tool to install rivet nuts?

A: Yes. A rivet nut tool (rivnut gun) with the correct mandrel size is required. Hand-operated, pneumatic, and hydraulic tools are all compatible. Do not attempt to install with a standard rivet gun — the thread will be damaged.

Q: What does A4-80 mean?

A: A4 designates 316 austenitic stainless steel. 80 designates the minimum tensile strength class of 800 MPa, equivalent to property class 8.8 in carbon steel. A4-80 is the highest standard grade for stainless steel fasteners.