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

Parameter	Value
Material	304 Stainless Steel
Grade	A2
Drive	Hex socket (Allen)
Head Style	Button head with washer collar (flanged)
Size Range	M2, M2.5, M3, M4, M5, M6, M8
Thread Type	Machine thread (metric ISO)
Standard	ISO 7380.2

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.

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