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Rapid Online - Rapid Electronics Ltd.£1.16Visit shop Toolcraft Slotted Flat Top Sheet Metal Screws DIN 7971 2.9 x 9.5mm...
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These TOOLCRAFT sheet metal screws are designed for DIY enthusiasts and professionals needing a reliable fastener for thin metal applications. The key benefit is their self-tapping nature, allowing for quick installation without pre-drilled holes in many materials. A potential caveat is their specific thread size and head style, which may not be suitable for all projects, requiring careful consideration of compatibility.
| Model Part Number | 839814 |
|---|---|
| Brand | TOOLCRAFT |
Self-tapping means the screw is designed to cut its own thread into the material as it is driven, eliminating the need for a pre-drilled and tapped hole in many applications.
The cheese head is a low-profile, slightly rounded head style that sits flush or nearly flush with the surface, providing a neat finish and a smaller footprint compared to pan or round heads.
While technically possible in very soft woods, these screws are specifically designed for metal and plastic. Wood screws have different thread profiles and are generally a better choice for wood applications.
These screws adhere to DIN 7971 and ISO 1481 standards, which specify dimensions and performance characteristics for slotted cheese head screws.
Galvanised steel provides good resistance to rust and corrosion in typical indoor and mild outdoor environments. For highly corrosive conditions, stainless steel or coated fasteners might be more appropriate.
Grade 4.8 refers to the material strength class of the steel. For steel screws, the first digit indicates the ultimate tensile strength (e.g., 400 MPa), and the second digit indicates the yield strength (e.g., 80% of the tensile strength).
Each pack contains 20 screws.
Ensure the material is suitable for self-tapping. For harder metals, drill a pilot hole slightly smaller than the screw's minor diameter (approx. 2mm).
Use a screwdriver that precisely fits the slot. Apply firm, consistent downward pressure and avoid over-tightening. Ensure the screw is not cross-threaded.
This may indicate excessive force or a material that is too hard. Back out the screw and check for any obstructions or try drilling a pilot hole.
The material may be too soft, or the thread may not have fully engaged. Consider using a larger screw or a different fastening method if required holding power is not achieved.
Setup: These are self-tapping screws and do not require pre-drilling in soft materials like thin sheet metal or plastic. For harder metals, a pilot hole of approximately 2mm is recommended. Use a flathead screwdriver that matches the slot width for proper engagement.
Compatibility: These screws conform to DIN 7971 and ISO 1481 standards. They are best suited for joining materials where the screw can tap its own thread. Compatibility is generally with sheet metal, thin gauge steel, aluminium, and some plastics. Ensure the 2.9mm thread size is appropriate for your material thickness and required holding strength.
Care: Store screws in a dry environment to prevent premature corrosion of the galvanised coating. Clean any debris from the screw head before driving to ensure a good fit with the screwdriver. While galvanised steel offers good protection, avoid prolonged exposure to highly corrosive environments without additional protection.
