The M3 countersunk bolt is a micro-sized fastener ideal for electronics, robotics, drones, and fine mechanical assemblies. Featuring a flat head design with hex socket drive, these bolts provide flush mounting and a clean, snag-free surface in space-constrained applications.
๐ฉ What is an M3 Countersunk Bolt?
An M3 countersunk bolt refers to a bolt with a 3mm diameter metric thread, designed with a conical flat head that sits flush with the surface when installed. This ensures:
- Smooth and professional finishes in precision assemblies
- Secure fastening without protruding bolt heads
- Efficient load distribution in thin plates or compact structures
โ Key Specifications
- Thread Size: M3 x (6mm, 8mm, 10mm, 12mm, 16mm, 20mm, custom lengths)
- Head Type: Flat countersunk head (DIN 7991 / ISO 10642)
- Drive Type: Hex socket (Allen)
- Material Options: Stainless steel (304, 316), alloy steel, titanium
- Surface Finish: Plain, zinc plated, black oxide, anodized titanium
- Standards Compliance: DIN, ISO, ASTM
โ๏ธ Applications of M3 Countersunk Bolts
โ Electronics assembly โ circuit board mounting, enclosures
โ Robotics and automation โ structural frames, end effectors
โ Drone manufacturing โ lightweight airframe and accessory fastening
โ Medical devices โ precision instruments requiring biocompatibility
โ Small mechanical parts โ camera mounts, model engineering
๐ง Advantages of Choosing Our M3 Countersunk Bolts
โ
Flush mounting capability for compact designs
โ
Hex socket drive ensures precise torque application
โ
Micro sizes with high precision machining
โ
Wide material options for strength, weight, and corrosion resistance
โ
Custom lengths and surface treatments available
๐ฆ Packaging & Supply Details
- MOQ: 1,000 pcs per size
- Packaging: Small cartons with labels / bulk bags / OEM packaging
- Lead Time: 5โ10 working days based on order quantity
- Customization: Length, material grade, surface finish, logo engraving
๐ก Why Choose Our M3 Countersunk Bolts?
As a professional micro fastener manufacturer and supplier, we offer:
โ Strict quality control from raw material to final inspection
โ Competitive factory pricing and fast delivery
โ OEM & ODM services to support electronics, robotics, and drone manufacturers
โ Export experience to Europe, North America, Southeast Asia, and the Middle East
๐ Learn More
Looking for precision M3 countersunk bolts for your electronics or drone projects?
๐ Visit our product page here to view detailed specifications, material options, and place your order with confidence.
๐ฉ Contact Us Today
Get in touch for technical drawings, free consultation, and the best factory quotations to support your micro assembly projects.