Simpson MTH Wood Underlayment Screw Collated #7 x 1-1/4 in. Gray Phosphate 2500-Pack Cold-Formed Steel Connectors What do the working length

What do the working length and overall length measurements mean

Optimal choice for high-performance use in seismic and high-wind conditions

What materials and treatments are used to ensure the durability of this bit

The stainless steel material resists oxidation and surface degradation that would compromise a standard coated screw over time in those conditions

These Sleeve-All expanding anchors are designed for use in all types of solid base materials

Simpson MTH Wood Underlayment Screw Collated #7 x 1-1/4 in. Gray Phosphate 2500-Pack Cold-Formed Steel Connectors What do the working lengthSimpson Strong Drive MTH Wood Underlayment Screw (Collated) #7 x 1 1 4 in. Gray Phosphate, 2500 Pack (Model MTH114S) is engineered by Simpson Strong Tie for fast and secure underlayment to subfloor installations. Unlike nails, this screw features an intricate high low thread pattern designed to prevent squeaking by holding underlayment tight to the subfloor and preventing pull out. Its compact trim head allows for a flush surface and prevents floor