#14 x 3-1/2" (25 pcs) Hex Washer Head Self Drilling Screws, 410 Stainless Steel Metal Sheet Tek Screws, Self Tapping Point, No Pre-drilled Hole Needs

#14 x 3-1/2" (25 pcs) Hex Washer Head Self Drilling Screws, 410 Stainless Steel Metal Sheet Tek Screws, Self Tapping Point, No Pre-drilled Hole Needs

Flange Diameter: 0.512" (13mm) max | Drive: 10mm External Hex (fits 3/8" socket) | Thread Size: #14 (0.245" ANSI)| Screw Length: 3-1/2" (90mm) under head Thread Coverage: Threaded on Both Ends; Quantity: 25 pieces Material: 410 Stainless steel is superior to regular steel and zinc plated fasteners, provides good strength and corrosion resistance in humid/outdoor environments; High-tensile strength resists bending or snapping during high-torque applications; Plain natural finish maintains durability without coating that may chip or peel over time Ideal Application Scenarios: Secures metal-to-metal joints, perfect for HVAC installations, electrical enclosures, or automotive panels; Fastens metal to wood, reliably mounts brackets, rails, or joist hangers to decks, fences, and timber frames; Outdoor/structural projects, roofing, sheds, pergolas, and machinery – resists weathering and stains Pro Usage Tips: 1) Choose a screw 1/2 inch longer than your combined material thickness (e.g., 2" screw for 1.5" metal+wood); 2) Avoid galvanic corrosion, isolate from dissimilar metals (e.g., aluminum) in wet conditions; 3) Apply steady pressure – let the drill point pierce without forcing Hex washer head self drilling screws are designed with a drill point at the tip to pre-drill the screw hole as you go with a “thrilling-like” action (threading or drilling) to eliminate separate drilling, tapping, and installation actions. The length of the drill determines the material thickness which the screw can reliably penetrate. They are ideal use for wood, metal or other tough materials and known for their effecient application performance and endurance. You could see them around because they are widely used in a variety of industries such as construction, manufacturing, engineering, assembling and so on. The 410 stainless steel provide perfect strength and good corrosion resistance in bad environments like high temperature, cold weather and high humidity areas without the need for time consuming and costly maintenance.