# Buy triform spread rivet aluminium 4.0x21mm at Autoservice ## Triform spread rivet aluminium 4.0x21mm for clamping range 5.0-9.0mm (20 pieces) Fasteners / Blind rivets / Spreader nails Aluminium spread rivet 4.0x21mm with triform closure, ideal for soft materials. ## Prices and stock - **SIN-AHS40-21**: € 7,49 incl. VAT — 4 in stock ## Order URL [Triform spread rivet aluminium 4.0x21mm for clamping range 5.0-9.0mm (20 pieces)](https://www.auto-service.be/en/fasteners/blind-rivets/spreader-nails/spreader-nail-triform-alualu-40x21mm-50-90-20pcs) ## Alternate URLs - **nl**: [Triform spread rivet aluminium 4.0x21mm for clamping range 5.0-9.0mm (20 pieces)](https://www.auto-service.be/nl/bevestigingsmateriaal/blindklinknagels/spreidnagels/spreidnagel-triform-alualu-40x21mm-50-90-20st) - **fr**: [Triform spread rivet aluminium 4.0x21mm for clamping range 5.0-9.0mm (20 pieces)](https://www.auto-service.be/fr/materiel-de-fixation/rivets-aveugles/pose-de-clous/rivet-expansible-triform-alualu-40x21mm-50-90-20pc) - **en**: [Triform spread rivet aluminium 4.0x21mm for clamping range 5.0-9.0mm (20 pieces)](https://www.auto-service.be/en/fasteners/blind-rivets/spreader-nails/spreader-nail-triform-alualu-40x21mm-50-90-20pcs) ## Images - ![Product image](https://www.auto-service.be/assets/media/6893/conversions/spreidnagel-triform-alualu-40x21mm-50-90-20st-8151-optimized.jpg) ## Specifications - **Reference**: SIN-AHS40-21 ## Product description ### Optimal fastening for soft materials This spread rivet, also known as umbrella or triform rivet, is specially designed for securely joining soft or thin materials such as plastic, thin steel sheets, wood, and plasterboard. When installed, the rivet spreads behind the material into three equal ribs, providing a large contact surface and an even distribution of clamping force. ### Specifications - **Diameter**: 4.0 mm - **Length**: 21 mm - **Clamping range**: 5.0 - 9.0 mm - **Sleeve material**: Aluminium AlMg 3 / 3.5 (5154) - **Mandrel material**: Aluminium AlMg 5 (5056) - **Head shape**: Flat head - **Shear strength**: 500 N - **Tensile strength**: 800 N - **Pre-drill diameter**: 4.2 mm (max. 4.4 mm) ### Applications in the automotive sector In the automotive sector, this spread rivet is ideal for various applications, such as attaching license plates, repairing window mechanisms, and mounting mud flaps. Thanks to the large closing head, the clamping force is distributed evenly, preventing the rivet from being pulled through the material. ### Easy installation Installing this spread rivet is simple and quick. During the riveting process, the mandrel falls out of the hollow rivet, after which the rivet sleeve splits into three parts on the closing head side. This results in a large contact surface with the material to be fastened, ensuring a strong and reliable connection. ### Advantages of aluminium construction - **Corrosion resistance**: The all-aluminium construction offers excellent resistance to corrosion, extending the lifespan of the connection. - **Lightweight**: Aluminium is lightweight, helping to reduce the overall weight of the construction without compromising strength. - **Vibration resistant**: The non-removable mandrel head ensures a vibration-resistant connection, which is essential in applications where vibrations occur. ### Packaging These spread rivets are supplied in a pack of 20 pieces, suitable for both professional use and DIY projects. ### Summary With the triform spread rivet aluminium 4.0x21mm, you have a high-quality fastening solution specially designed for safe and efficient joining of soft and thin materials. The unique spreading function ensures a strong and reliable connection, while the aluminium construction guarantees durability and corrosion resistance. ## Breadcrumbs - [Fasteners](https://www.auto-service.be/en/fasteners) - [Blind rivets](https://www.auto-service.be/en/fasteners/blind-rivets) - [Spreader nails](https://www.auto-service.be/en/fasteners/blind-rivets/spreader-nails) ## Related products - [Triform spread rivet Alu/alu 4.0x14mm for strong fastening](https://www.auto-service.be/en/fasteners/blind-rivets/spreader-nails/spread-nail-triform-alualu-40x14mm-10-30-20pcs) - [Triform spread rivet Alu/Alu 4.0x18mm for soft materials](https://www.auto-service.be/en/fasteners/blind-rivets/spreader-nails/spread-nail-triform-alualu-40x18mm-30-70-20pcs) - [Triform spread rivet aluminium/aluminium 4.8x16mm (1.0-3.0) (20 pieces)](https://www.auto-service.be/en/fasteners/blind-rivets/spreader-nails/spread-nail-triform-alualu-48x16mm-10-30-20pcs) - [Triform spread rivet alu/alu 4.8x20.5mm (3.0-9.0) (100 pieces)](https://www.auto-service.be/en/fasteners/blind-rivets/spreader-nails/spread-nail-triform-alualu-48x205mm-30-90-100pcs) - [Triform spread rivet Alu/Alu 4.8x24.5mm for soft materials](https://www.auto-service.be/en/fasteners/blind-rivets/spreader-nails/spread-nail-triform-alualu-48x245mm-50-120-100pcs) ## Webshop catalogue - [Car Cleaning](https://www.auto-service.be/en/car-cleaning) - [Exterior](https://www.auto-service.be/en/car-cleaning/exterior) - [Car Shampoo](https://www.auto-service.be/en/car-cleaning/car-shampoo) - [Interior](https://www.auto-service.be/en/car-cleaning/interior) - [Leather upholstery](https://www.auto-service.be/en/car-cleaning/leather-upholstery) - [Rims & tires](https://www.auto-service.be/en/car-cleaning/rims-tires) - [Polishing](https://www.auto-service.be/en/car-cleaning/polishing) - [Windows](https://www.auto-service.be/en/car-cleaning/windows) - [Wax & protect](https://www.auto-service.be/en/car-cleaning/wax-protect) - [Scratch treatment](https://www.auto-service.be/en/car-cleaning/scratch-treatment) - [Accessories](https://www.auto-service.be/en/car-cleaning/accessories) - [Kits](https://www.auto-service.be/en/car-cleaning/kits) - [Luggage & Transport](https://www.auto-service.be/en/luggage-transport) - [Bike carriers](https://www.auto-service.be/en/luggage-transport/bike-carriers) - [Roof box](https://www.auto-service.be/en/luggage-transport/roof-box) - [Roof rack](https://www.auto-service.be/en/luggage-transport/roof-rack) - [Trailer accessories](https://www.auto-service.be/en/luggage-transport/trailer-accessories) - [Trailer lighting](https://www.auto-service.be/en/luggage-transport/trailer-lighting) - [Work & flashing lights](https://www.auto-service.be/en/luggage-transport/work-flashing-lights) - [Tire Material](https://www.auto-service.be/en/luggage-transport/tire-material) - [Towbar cargo boxes](https://www.auto-service.be/en/luggage-transport/towbar-cargo-boxes) - [Breakdown underway](https://www.auto-service.be/en/luggage-transport/breakdown-underway) - [Tools](https://www.auto-service.be/en/tools) - [Hand Tools](https://www.auto-service.be/en/tools/hand-tools) - [Impact Sockets](https://www.auto-service.be/en/tools/impact-sockets) - [Sockets and bits](https://www.auto-service.be/en/tools/sockets-and-bits) - [Electric](https://www.auto-service.be/en/tools/electric) - [Pneumatic](https://www.auto-service.be/en/tools/pneumatic) - [Special for automotive](https://www.auto-service.be/en/tools/special-for-automotive) - [Battery powered tools](https://www.auto-service.be/en/tools/battery-powered-tools) - [Cleaning machines](https://www.auto-service.be/en/tools/cleaning-machines) - [Garage equipment](https://www.auto-service.be/en/tools/garage-equipment) - [Tool walls](https://www.auto-service.be/en/tools/tool-walls) - [High-voltage tools](https://www.auto-service.be/en/tools/high-voltage-tools) - [Sandblasting](https://www.auto-service.be/en/tools/sandblasting) - [Ultrasonic cleaners](https://www.auto-service.be/en/tools/ultrasonic-cleaners) - [Degreaser Bins](https://www.auto-service.be/en/tools/degreaser-bins) - [Battery chargers and boosters](https://www.auto-service.be/en/tools/battery-chargers-and-boosters) - [Lift bridges](https://www.auto-service.be/en/tools/lift-bridges) - [Air conditioning](https://www.auto-service.be/en/tools/air-conditioning) - [Workshop press](https://www.auto-service.be/en/tools/workshop-press) - [Tool trolleys](https://www.auto-service.be/en/tools/tool-trolleys) - [Garage Management](https://www.auto-service.be/en/tools/garage-management) - [Workwear and protection](https://www.auto-service.be/en/tools/workwear-and-protection) - [Bodywork](https://www.auto-service.be/en/bodywork) - [Preparation](https://www.auto-service.be/en/bodywork/preparation) - [Sanding](https://www.auto-service.be/en/bodywork/sanding) - [Filling](https://www.auto-service.be/en/bodywork/filling) - [Anti-rust protection](https://www.auto-service.be/en/bodywork/anti-rust-protection) - [Paint](https://www.auto-service.be/en/bodywork/paint) - [Spray cans](https://www.auto-service.be/en/bodywork/spray-cans) - [Spray guns & accessories](https://www.auto-service.be/en/bodywork/spray-guns-accessories) - [Windshield replacement](https://www.auto-service.be/en/bodywork/windshield-replacement) - [Adhesives & silicones](https://www.auto-service.be/en/bodywork/adhesives-silicones) - [Welding equipment](https://www.auto-service.be/en/bodywork/welding-equipment) - [Grinding & Drilling](https://www.auto-service.be/en/bodywork/grinding-drilling) - [Mounting Clips](https://www.auto-service.be/en/bodywork/mounting-clips) - [Body repair tools](https://www.auto-service.be/en/bodywork/body-repair-tools) - [Spray Booth](https://www.auto-service.be/en/bodywork/spray-booth) - [Electrical](https://www.auto-service.be/en/electrical) - [Cable protection](https://www.auto-service.be/en/electrical/cable-protection) - [Battery charging clamps](https://www.auto-service.be/en/electrical/battery-charging-clamps) - [Battery terminal](https://www.auto-service.be/en/electrical/battery-terminal) - [Connectors](https://www.auto-service.be/en/electrical/connectors) - [Insulated cable lugs](https://www.auto-service.be/en/electrical/insulated-cable-lugs) - [Non-insulated terminal lugs](https://www.auto-service.be/en/electrical/non-insulated-terminal-lugs) - [Cables](https://www.auto-service.be/en/electrical/cables) - [Crimp Connectors](https://www.auto-service.be/en/electrical/crimp-connectors) - [Mass Strips](https://www.auto-service.be/en/electrical/mass-strips) - [Relay](https://www.auto-service.be/en/electrical/relay) - [Switches & control lights](https://www.auto-service.be/en/electrical/switches-control-lights) - [Fuses](https://www.auto-service.be/en/electrical/fuses) - [Tools](https://www.auto-service.be/en/electrical/tools) - [Parts](https://www.auto-service.be/en/parts) - [Hose clamps](https://www.auto-service.be/en/parts/hose-clamps) - [Hoses](https://www.auto-service.be/en/parts/hoses) - [Hose connections](https://www.auto-service.be/en/parts/hose-connections) - [Brakes](https://www.auto-service.be/en/parts/brakes) - [Dust covers](https://www.auto-service.be/en/parts/dust-covers) - [Gaskets](https://www.auto-service.be/en/parts/gaskets) - [Exhaust accessories](https://www.auto-service.be/en/parts/exhaust-accessories) - [Windshield Wipers](https://www.auto-service.be/en/parts/windshield-wipers) - [Batteries](https://www.auto-service.be/en/parts/batteries) - [Ignition System](https://www.auto-service.be/en/parts/ignition-system) - [Fasteners](https://www.auto-service.be/en/fasteners) - [Assortments](https://www.auto-service.be/en/fasteners/assortments) - [Blind rivets](https://www.auto-service.be/en/fasteners/blind-rivets) - [Blind rivet nuts](https://www.auto-service.be/en/fasteners/blind-rivet-nuts) - [Bolts](https://www.auto-service.be/en/fasteners/bolts) - [Nuts](https://www.auto-service.be/en/fasteners/nuts) - [Rings](https://www.auto-service.be/en/fasteners/rings) - [Screws](https://www.auto-service.be/en/fasteners/screws) - [Threaded rods](https://www.auto-service.be/en/fasteners/threaded-rods) - [Plate nuts and plate bolts](https://www.auto-service.be/en/fasteners/plate-nuts-and-plate-bolts) - [Split pins](https://www.auto-service.be/en/fasteners/split-pins) - [Cable Ties](https://www.auto-service.be/en/fasteners/cable-ties) - [Vibration dampers](https://www.auto-service.be/en/fasteners/vibration-dampers) - [Oil & Additives](https://www.auto-service.be/en/oil-additives) - [Additives](https://www.auto-service.be/en/oil-additives/additives) - [Oil](https://www.auto-service.be/en/oil-additives/oil) - [Liquids](https://www.auto-service.be/en/oil-additives/liquids) - [Accessories](https://www.auto-service.be/en/oil-additives/accessories) - [Adhesives](https://www.auto-service.be/en/oil-additives/adhesives) - [Hygiene](https://www.auto-service.be/en/oil-additives/hygiene) - [Grease](https://www.auto-service.be/en/oil-additives/grease) - [Technical Products](https://www.auto-service.be/en/oil-additives/technical-products) - [Crankcases plugs & sealing rings](https://www.auto-service.be/en/oil-additives/crankcases-plugs-sealing-rings) - [Mobile Fuel tanks](https://www.auto-service.be/en/oil-additives/mobile-fuel-tanks) - [Accessories](https://www.auto-service.be/en/accessories) - [Audio](https://www.auto-service.be/en/accessories/audio) - [Exterior](https://www.auto-service.be/en/accessories/exterior) - [Interior](https://www.auto-service.be/en/accessories/interior) - [Car Seat Covers](https://www.auto-service.be/en/accessories/car-seat-covers) - [Car Lights](https://www.auto-service.be/en/accessories/car-lights) - [Car chargers & smartphone holders](https://www.auto-service.be/en/accessories/car-chargers-smartphone-holders) - [Air Fresheners](https://www.auto-service.be/en/accessories/air-fresheners) - [L-apprentice](https://www.auto-service.be/en/accessories/l-apprentice) - [Dashcams & radar detectors](https://www.auto-service.be/en/accessories/dashcams-radar-detectors) - [Batteries](https://www.auto-service.be/en/accessories/batteries) - [Winter Products](https://www.auto-service.be/en/accessories/winter-products) - [Car mats & trunk shells](https://www.auto-service.be/en/accessories/car-mats-trunk-shells) - [Merchandise](https://www.auto-service.be/en/accessories/merchandise)