M3–M6 304 Stainless Steel Hex Socket Low Profile Head Cap Screws — A2-70

Low profile hex socket cap screws (also called button socket head or thin head cap screws) provide the torque and security of a hex socket drive in a head height approximately 40–50% lower than a standard ISO 4762 socket head cap screw. This makes them the correct choice wherever vertical clearance is limited — such as under PCBs, inside slim electronics enclosures, or in robotics joints where a standard cap head would foul adjacent components.

Key Specifications

Parameter	Value
Material	304 Stainless Steel
Grade	A2-70
Drive	Hex socket (Allen)
Head Style	Low profile / thin head cap
Thread Type	Metric machine thread (ISO)
Size Range	M3, M4, M5, M6
Standard	ISO 14580 / DIN 6912

Why Choose Low Profile Cap Screws?

Reduced head height — DIN 6912 low profile head is ~40% thinner than standard ISO 4762; fits in tight clearance applications impossible for standard cap screws
Hex socket drive — higher torque than Phillips or slotted; no cam-out; works with standard Allen keys and hex bit drivers
A2-70 304 stainless — corrosion-resistant for electronics, robotics, and outdoor enclosures
Machine thread — requires pre-tapped hole or nut; provides precise, repeatable clamping force
M3–M6 range — covers all standard electronics and mechanical assembly sizes

Typical Applications

PCB mounting where head clearance below board is limited
Slim electronics enclosure assembly (aluminium extrusion, sheet metal)
Robotics joint and servo bracket assembly with tight clearance
3D printer linear rail and carriage mounting (MGN9, MGN12 rails)
CNC machine axis and gantry assembly
Aluminium extrusion T-slot assembly (2020, 3030, 4040 profiles)

Compatible With

Allen keys / hex bit drivers: M3=2mm, M4=2.5mm, M5=3mm, M6=4mm hex
Pre-tapped holes or hex nuts / nyloc nuts M3–M6
Aluminium extrusion T-slot nuts (M3, M4, M5, M6)
Linear rail mounting: MGN9 (M3), MGN12 (M3/M4), MGN15 (M4/M5)

Package Contents

Low profile cap screws in selected size and quantity (per variant)

Frequently Asked Questions

Q: What is the head height of a low profile cap screw compared to standard?: A: DIN 6912 low profile: M3=1.5mm, M4=2.0mm, M5=2.5mm, M6=3.0mm head height. Standard ISO 4762: M3=3mm, M4=4mm, M5=5mm, M6=6mm. Low profile heads are exactly half the height of standard cap screws.
Q: Do these require a pre-tapped hole?: A: Yes. These are machine thread screws and require either a pre-tapped hole or a nut. They are not self-tapping. Use an M3–M6 tap or pair with a hex nut, nyloc nut, or T-slot nut.
Q: What hex key size do I need?: A: M3 requires 2mm hex; M4 requires 2.5mm hex; M5 requires 3mm hex; M6 requires 4mm hex. These are standard metric hex key sizes.