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

Parameter	Value
Material	316 Stainless Steel
Grade	A4-80
Head Style	Flat head (countersunk / flush)
Body Style	Semi-hex (anti-rotation)
Thread Type	Metric (M3, M4, M5, M6, M8, M10, M12)
Installation	Rivet nut tool / rivnut gun
Min. Sheet Thickness	0.5mm (M3) — 1.0mm (M12)
Standard	DIN 7338 / ISO 15977

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.