304 A2 Stainless Steel Button Head Screws with Washer Collar ISO7380.2 Hex Socket Allen Bolts M2–M8

304 A2 Stainless Steel Button Head Screws with Washer Collar — ISO7380.2 Hex Socket Allen Bolts M2–M8

ISO7380.2 button head screws with integrated washer collar combine the low-profile dome of a button head with a built-in flange washer that distributes clamping load and eliminates the need for a separate washer. The hex socket (Allen) drive provides high torque without cam-out, making these the preferred fastener for electronics enclosures, robotics, and precision mechanical assembly where a clean, low-profile finish is required.

Key Specifications

Why Choose ISO7380.2 Button Head Screws with Washer Collar?

• Integrated washer collar — built-in flange eliminates separate washer; larger bearing surface prevents pull-through in soft materials and thin sheet metal
• Low-profile button head — dome profile is lower than standard cap head; clean aesthetic for visible fasteners on electronics and robotics
• Hex socket drive — no cam-out; higher torque than Phillips; works with standard Allen keys and hex bit drivers
• A2 304 stainless — corrosion-resistant for electronics, outdoor enclosures, and humid environments
• M2–M8 range — covers miniature electronics (M2) through medium mechanical assembly (M8)

Typical Applications

• Electronics enclosure and instrument panel assembly (aluminium, ABS, polycarbonate)
• Robotics chassis and servo bracket mounting (M3–M5)
• 3D printer frame assembly (aluminium extrusion 2020/3030/4040)
• CNC machine axis and gantry assembly (M4–M8)
• Aluminium extrusion T-slot assembly with integrated washer for load distribution
• Bicycle and e-bike component mounting (M4–M6)

Compatible With

• Allen keys / hex bit drivers: M2=1.5mm, M3=2mm, M4=2.5mm, M5=3mm, M6=4mm, M8=5mm hex
• Pre-tapped holes or hex nuts / nyloc nuts M2–M8
• Aluminium extrusion T-slot nuts (M3, M4, M5, M6)
• ISO 7380.2 standard counterbore dimensions

Package Contents

• Button head screws with washer collar in selected size, length, and quantity (per variant)

Frequently Asked Questions

Q: What is the difference between ISO7380.1 and ISO7380.2?

A: ISO7380.1 is a standard button head socket screw without a washer collar. ISO7380.2 adds an integrated washer collar (flange) that provides a larger bearing surface. Use ISO7380.2 when you need load distribution without a separate washer, or when the screw must not rotate freely in an oversized hole.

Q: What hex key size do I need?

A: M2=1.5mm, M2.5=1.5mm, M3=2mm, M4=2.5mm, M5=3mm, M6=4mm, M8=5mm hex key.

Q: Can these be used in aluminium extrusion T-slots?

A: Yes. The washer collar provides additional bearing surface against the extrusion face, reducing the risk of the screw head pulling into the T-slot channel. Use with M3, M4, M5, or M6 T-slot nuts as appropriate for your extrusion profile.