M6 Button Head Screw ISO 7380 A2 Stainless Steel

The M6 button head screw is a low-profile socket fastener built to the ISO 7380 head standard and machined from A2 stainless steel. Its rounded, shallow head sits nearly flush against the mounting surface, giving a clean finish wherever a bolt head would otherwise be visible or in the way of moving parts.

This fastener suits metalworkers, CNC machine builders and workshops assembling aluminium profile frames, enclosures and jigs, wherever a dependable M6 fixing must resist rust without a plated or coated finish.

Features

The rounded button head of this M6 fastener spreads clamping load over a wider bearing surface than a standard cap screw, which helps when fixing into slotted aluminium profile or thin sheet. The hexagon socket drive allows high torque with a standard Allen key, even where clearance around the head is tight.

On the M6 button head screw, A2 stainless steel gives good resistance to oxidation and mild chemical exposure, making it a practical choice for parts that see occasional moisture, cutting fluid or outdoor storage. No additional plating or surface treatment is needed for typical indoor and semi-outdoor use.

• Head style: button head per ISO 7380
• Material: stainless steel A2 (18-8)
• Thread: M6, metric coarse pitch
• Drive: hexagon socket (Allen)
• Corrosion resistance without extra coating
• Low, rounded head profile

Where the M6 button head screw is used

This size and head style is common in aluminium extrusion assemblies, T-slot frames and machine enclosures, where a low head keeps sliding carriages, covers or brackets from catching on a protruding bolt. It is also fitted on CNC router and mill frames, camera rigs, and general fixture work where the fastener stays visible on the finished build.

Because the M6 button head screw is a general-purpose fastener rather than a structural bolt, it is best kept to light-to-moderate clamping duty rather than high-shear structural joints. Browse the full range of CNC hardware and fasteners in the torgoscnc.gr shop to match it with matching nuts, washers and profile brackets.

What to check before buying

Confirm the thread length of the M6 button head screw matches the material stack you are clamping; a screw that is too long will bottom out in a blind hole or protrude past a nut, while one that is too short will not engage enough thread. Check that the hexagon socket size on hand matches the screw, since button head screws typically use a smaller Allen key than a standard socket cap screw of the same diameter.

If the joint carries significant shear or tensile load, a button head screw is usually not the right choice; a socket cap screw with a larger bearing head and thread engagement is better suited. Mixing A2 stainless screws directly against aluminium in damp conditions can also lead to galvanic corrosion over time, so an isolating washer is worth considering for outdoor assemblies.

Installation and maintenance

Thread the M6 button head screw by hand first to avoid cross-threading, then tighten with a hexagon key to a firm, snug torque. A2 stainless fasteners are softer than alloy steel and can gall if overtightened into an aluminium tapped hole, so a light anti-seize on the thread helps on repeated assembly. Background on the material’s properties is available on the Wikipedia entry for stainless steel.

Routine maintenance is minimal: check torque periodically on screws exposed to vibration, and wipe away coolant or dust build-up around the head to keep the socket clear for future removal. Because A2 stainless does not rust, no periodic recoating is required.

FAQ

What does the ISO 7380 standard cover? It defines the dimensions of button head socket screws, including the head diameter, height and hexagon socket size for each thread size.

Is A2 stainless steel strong enough for machine frames? A2 stainless suits light-to-moderate clamping loads well; for high-stress structural joints, a higher-grade alloy or a socket cap screw is generally preferred.

What size Allen key fits an M6 button head screw? Most M6 button head screws to ISO 7380 use a 4mm hexagon key; check the specific screw before ordering tools.