Self-drilling metal screws Celo 4.8x13 mm zinc-coated CNBOP, pack 250

Celo self-drilling metal screws 4.8x13 mm zinc-coated CNBOP, pack of 250 are designed for fastening thin metal sheets, profiles and light steel components without the need for pre-drilling. Each fastener combines a self-drilling tip with a thread optimized for metal-to-metal joining, while the zinc coating provides basic corrosion resistance suitable for indoor and covered outdoor applications. The CNBOP certification indicates compliance with specified safety or quality requirements for use in construction and installation contexts.

Advantages

These Celo self-drilling screws enable quick and consistent assembly by eliminating the separate drilling step. The 4.8x13 mm dimensions are suitable for joining thin panels and light gauge profiles, and the zinc coating reduces surface corrosion on exposed threads and heads. Supplied in a pack of 250, the set supports medium-sized projects and repetitive installation tasks while the self-drilling point and sharp thread ensure reliable engagement in metal substrates.

Suitable for

• Fastening thin metal sheets to metal profiles
• Joining light steel components in roofing and cladding
• General metal fabrication and installation work
• Interior and covered exterior applications where basic corrosion protection is acceptable

When it may not be suitable

These screws are intended for thin metal and light gauge applications; they are not suitable for thick structural steel or situations requiring high shear or tensile loads. The zinc coating offers limited corrosion resistance and is not intended for prolonged exposure to aggressive outdoor environments or marine conditions without additional protection.

Key specifications

• Size: 4.8 x 13 mm (diameter x length)
• Type: Self-drilling screw with drilling tip and metal thread
• Material finish: Zinc-coated for basic corrosion resistance
• Pack quantity: 250 pieces
• Typical applications: Thin sheet metal fastening and light profile assembly

How to use

Select the correct screw length (4.8x13 mm) for the combined thickness of materials to be joined. Use a compatible driver bit and a drill or driver with appropriate torque control; apply steady pressure so the self-drilling tip penetrates the metal without wandering. Drive until the head sits flush or to the required seating depth, avoiding over-torquing which can strip threads or damage the coating. For long runs, work progressively and check alignment and tightness at intervals.

What to consider before purchase

• Confirm that 4.8 x 13 mm length is sufficient for the combined thickness of materials.
• Assess whether zinc coating provides adequate corrosion protection for your environment.
• Verify compatibility of the screw head and drive type with your tools.
• Consider pack size (250) relative to the scope of your project to avoid shortages or excess.

Usage recommendations

For consistent results, use a variable-speed driver set to a moderate torque, start holes at a perpendicular angle, and avoid repeated overtightening. In exposed or corrosive environments, apply additional sealing or specify a higher corrosion class fastener.