Metal Supa Low Head Screws 12x18mm C3 (50 Pack)

The Metal Supa Low Head screws 12x18mm C3 are designed for the low-profile fixing of two-part joiner bases and the Sunglaze base onto metal subframes. The stand-out feature is the ultra-slim Supa Low head, which lets the base profile sit almost flush against the metal so that top caps and polycarbonate panels click into place without obstruction.

In a glazing system, the base must be fixed to the rafter before the top cap and sheet are snapped on. A standard hex or pan head often protrudes too far and interferes with those secondary components, or creates a pivot point that can lead to leaks. The low-profile head of this 12 gauge screw avoids that problem completely.

Each screw has a self-drilling tip that bites quickly into steel purlins and aluminium sections, and the C3-rated coating protects against corrosion in standard outdoor environments. It is a specialist fixing that keeps the assembly square and clean.

Key Features

• 12g x 18mm, sized for metal-to-metal base fixing
• Supa Low head that sits almost flush
• Self-drilling tip for quick metal fixing
• C3 corrosion protection for outdoor use
• Prevents interference with snap-on covers and panels
• Supplied in a 50 pack

Specifications

Applications

• Fixing two-part joiner bases to metal subframes
• Fixing the Sunglaze base to steel or aluminium
• Where a flush head is needed under a snap-on cap

What You Need To Complete The Job

These screws fix the Aluminium Sunglaze Base to the metal frame before the Aluminium Sunglaze Cap locks on. The complete Sunglaze system is in the Sunglaze category.

Frequently Asked Questions

Why use a Supa Low head screw?

When a joiner base is fixed to the frame, the top cap and sheet clip on afterwards. A standard screw head would protrude into that space and stop the parts seating properly. The Supa Low head sits nearly flush, so the assembly closes cleanly.

What metal do these screws fix into?

They are designed for steel purlins and aluminium sections used in roof framing. The self-drilling tip pierces light to medium gauge metal without a pilot hole, which keeps the installation fast.

What does the C3 coating protect against?

C3 is the corrosion classification for outdoor environments with moderate pollution and some salinity, which covers most urban and industrial roof installations. It gives the screw solid weather resistance without the cost of stainless steel.

How many screws are in a pack?

Each pack contains 50 screws. Allow one at each fixing position along the base track and order enough for the length of your joiner run.

Are these screws for timber or metal?

These are metal screws, designed for steel and aluminium subframes. For timber rafters and purlins, use the matching timber fixing for the Sunglaze base.