SPAX countersunk multipurpose screw 3.5x50/32 T20 Wirox (500 pcs/pack)

The SPAX T-STAR plus drive ensures maximum power transfer to the screwdriver bit—thanks to its unique hexalobular design, work is faster, more precise, and cam-out becomes a thing of the past. The bit’s perfect fit in the screw head makes repetitive fastening effortless and efficient.

A thin yet durable head is especially important when installing window and door frames. The SPAX-RA fully threaded screw is designed specifically for this purpose—it fastens without plugs and enables a clean finished result with no protruding heads.

The full thread extends along almost the entire length of the screw, allowing it to withstand significantly higher tensile and compressive loads than a partially threaded screw. This makes it an excellent choice for demanding wood joints, for example in structural applications—without unsightly metal connectors.

The 4CUT point shapes the screw tip like an arrow, allowing the wood fibers to be cleanly displaced during penetration. This reduces the risk of splitting, especially near edges, and lowers the torque required from the tool—in most cases, pre-drilling is not necessary.

For outdoor use, screws must be durable. The WIROX coating provides excellent corrosion protection without environmentally harmful chromium(VI). WIROX screws are an ideal solution for structures that are outdoors but not directly exposed to the elements, such as pergolas and carports. If the structures are directly exposed to rain and moisture, we recommend stainless steel screws.