Expansion Bolt Set Zinc-Plated Flower Nut M4x20mm 20 Pieces
High Quality
Free US Shipping
Hassle Free Returns
Eliminate loose connections with powerful fastenings
Reliable and durable fastening in wood, metal, and plastic — corrosion-resistant zinc plating, unique flower expansion nut for enhanced grip
Why is this Zinc-plated expansion pin set with flower expansion nut perfect for you?
✔ Enhanced clamping force with flower expansion nut: The flower expansion nut distributes holding force over a larger area, resulting in significantly stronger grip than conventional screws, ensuring more reliable connections for important projects.
✔ Corrosion-resistant zinc-plated carbon steel: Made from carbon steel with a zinc coating, this expansion pin set offers long-lasting protection against rust, suitable for both indoor and outdoor applications.
✔ Quick and easy installation: Designed for use with pneumatic tools and electric screwdrivers, these fasteners allow effortless and time-saving assembly, enhancing productivity and convenience.
Specifications
Material: Carbon steel with zinc coating
Size: M4 × 20 mm (approx. 5/32 in × 0.79 in)
Thread type: Metric thread
Surface treatment: Zinc-plated
Frequently asked questions
Quick answers about ordering from Couje. More detail on our full FAQ page.
How much does shipping cost, and how long does it take?
Shipping is free on every order — no minimum. Orders are typically delivered within 4–12 business days (processing included), and every order includes tracking. Full details are in our Shipping Policy.
What is your return policy?
You can return items within 30 days of delivery. Once your return is received and inspected, we process your refund to the original payment method. See our Return & Refund Policy for the full process.
How do I track my order?
As soon as your order ships, we email you a tracking number. You can follow your delivery at any time on our Track Your Order page.
How can I reach customer service?
Email us at support@couje.com or use our contact form. Our team is available Monday – Friday: 09:00 AM – 05:00 PM EST and replies within 24 hours. Saturday – Sunday: closed.