Self-drilling screws Celo 948197504K 4.8x19 mm zinc-plated for metal CNBOP pack of 250

Celo 948197504K zinc-plated self-drilling screws, size 4.8 x 19 mm, are designed to fasten thin metal sheets and make direct metal-to-metal connections without the need for pre-drilling. Supplied in a pack of 250, these screws include an integrated drill point that cuts through sheet metal and creates a mating thread in one operation. Rated for CNBOP applications, they are suitable for a range of light- and medium-duty fastening tasks in construction and metalworking environments.

Advantages

These self-drilling screws combine a corrosion-resistant zinc plating with a carbide or hardened drill tip to provide reliable penetration and holding power in thin metal substrates. The 4.8 x 19 mm dimensions make them compact yet strong enough for overlaps, trims, ducts and secondary metalwork. Supplied in a bulk pack of 250, they reduce downtime and help maintain a steady workflow on job sites where repetitive fastening is required.

Suitable for

• Fastening thin-gauge steel and aluminium sheets
• Metal-to-metal assemblies in HVAC, roofing and cladding
• Installation of trims, flashings and gutters
• Light metal fabrication and maintenance work

When it may not be suitable

These screws are intended for thin metal and sheet applications; they are not designed for use in heavy structural steel where larger diameter bolts or welds are required. The zinc plating offers corrosion resistance in typical environments, but for aggressive marine or highly corrosive atmospheres, a stainless steel or specially coated fastener would be a better choice.

Key specifications

• Material finish: zinc-plated
• Head and drive type: (refer to product images or label for head style and drive type)
• Overall size: 4.8 mm diameter × 19 mm length
• Point type: integrated self-drilling tip
• Quantity: 250 pieces per pack
• Intended substrate: thin metal sheets and metal-to-metal fastening

How to use

Use an appropriate power screwdriver or drill/driver with a compatible bit that matches the screw drive. Position the screw perpendicular to the workpiece, apply steady pressure, and run the driver at moderate speed until the head seats flush or to the required depth. There is no need to pre-drill for typical thin sheet metal; however, ensure proper alignment of mating parts and clamp them where necessary to prevent movement during installation.

What to consider before purchase

• Confirm that 4.8 x 19 mm length and diameter are suitable for the combined thickness of the materials to be fastened
• Assess environmental exposure to determine whether zinc plating is sufficient or a stainless/special coating is required
• Verify the head style and drive compatibility with your driver tools

Usage recommendations

For consistent results, use a clutch-equipped driver set to a torque appropriate for sheet metal screws to avoid overdriving or snapping. When installing in painted or coated surfaces, consider using a washer or sealing method where required to prevent moisture ingress.