self drillind screw with washer , Iran

A self-drilling screw with washer integrates a drill point that replaces the need for a pilot hole. The drill point angle typically ranges from 118 to 135 degrees for steel thicknesses of 0.7 to 6 millimeters. Heat treatment hardens the tip to 45 to 53 HRC while the main body remains at 32 to 39 HRC. The attached washer is either free-spinning or captive with an outer diameter of 12 to 25 millimeters. Common washer materials include carbon steel with zinc plating or stainless steel grade 304. Thread pitch is fine (14 to 24 TPI) for metal applications but becomes coarse for wood or plastic substrates. This design ensures immediate metal penetration and reduces assembly time by up to 50 percent compared to standard screws.

The ultimate tensile strength for carbon steel versions meets ASTM C1513 standards at a minimum of 800 megapascals. Stainless steel grades achieve about 700 megapascals with lower hardness but superior corrosion resistance. Ultimate torque before failure for a number 10 screw (4.8 mm diameter) reaches 8.5 Newton-meters. For a 1/4 inch screw (6.35 mm diameter), this value increases to approximately 20 Newton-meters. A number 3 drill point can penetrate up to 6 millimeters of combined steel sheet thickness without pre-drilling. The integrated washer distributes clamping force uniformly to prevent surface crushing on thin panels. EPDM rubber washers create a watertight seal with a contact pressure of 2 to 5 bars. This sealing capability is critical for metal building facades and steel structure roof assemblies.You can order and buy self drillind screw with washer from Iran by contacting us through whatsaap and email.
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