Phillips Flanged Pan Head Machine Screws M1.4 to M4 Multiple Lengths

Match the thread diameter (M1.4–M4) to your tapped hole or nut. For length, measure the material thickness you are fastening and add typically 1.5× the thread diameter for engagement depth. For example, M3 into 4mm aluminum generally calls for a 6mm (≈1/4") or 8mm (≈5/16") screw. When in doubt, choose the next longer size — you can always use a nut or stop at a shoulder.

The flanged head acts as a built-in washer, distributing clamping load over a wider area. This generally eliminates the need for a separate flat washer, reduces part count, and helps prevent the screw from pulling through softer materials like plastic or thin sheet metal. The flange diameter is listed in the variant name in parentheses — for example, M3*8=(7.0) means M3 thread, 8mm long, 7.0mm flange diameter.

These screws are typically manufactured from carbon steel with a zinc-plated or black-oxide finish, providing moderate corrosion resistance for indoor and light-duty applications. Exact grade and finish can vary by batch. Please contact us to confirm the specific material and coating for your order if your application has strict requirements.

Standard carbon steel screws with zinc plating offer limited outdoor corrosion resistance — generally suitable for sheltered or occasional-exposure conditions. For prolonged outdoor, marine, or high-humidity environments, stainless steel fasteners are generally recommended. Contact us if you need a stainless steel flanged pan head machine screw option.

These screws follow the ISO metric coarse-pitch thread standard (M-series). They are compatible with standard metric tapped holes, threaded inserts, and metric hex nuts of the corresponding size — M1.4, M2, M2.5, M3, M3.5, or M4. They are not compatible with UNC/UNF inch-series threads.

Recommended tightening torque varies by diameter and material grade. As a general reference for carbon steel: M2 typically handles 0.1–0.2 N·m, M3 typically 0.5–0.8 N·m, and M4 typically 1.2–2.0 N·m. Always verify torque specifications against your specific application and material requirements. Over-torquing small metric screws can strip threads or shear the head.

Use the correct bit size to prevent cam-out and head damage: M1.4–M2 generally use a PH0 bit; M2.5–M3 generally use a PH1 bit; M3.5–M4 generally use a PH2 bit. A magnetic bit holder and moderate speed are recommended for small screws.

Yes. Every size combination is available in quantities of 1, 10, 50, or 100 pieces. Order a single screw to verify thread fit and flange clearance in your assembly before committing to a larger quantity. Bulk pricing (50 or 100 pcs) offers a lower per-unit cost.