#12 x 4" Screws, 50 Pack Zinc Plated Steel Hex Head Screws with EPDM Washer

<strong>Description:</strong><br>1. Material: Both the screw and the metal washer are made of carbon steel, a zinc-plated surface finish, which is corrosion-resistant; the black washer is made of EPDM, which is wear-resistant and oxidation-resistant.<br>2. Advantages: The hex washer head has a flange with an EPDM rubber washer on the bottom to prevent leaks, loosening and damage to mating surfaces. The underside of the hex head provides a large flat bearing surface that reduces the possibility of crushing mating surfaces. When you tighten the screw, a flexible black EPDM rubber washer bonded to the metal washer creates a tight seal.<br>3. Easy to use: Unlike self-tapping screws, these self-drilling screws drill a hole and tap a thread in one operation. All you need to install them with a power drive tool.<br>4. Application: Hex head self-drilling screws are typically used in metal-to-metal and metal-to-wood applications. Widely used in the electrical and industry, most commonly on thin metals, for example with roofing, steel studs, etc.

• Material: Carbon Steel
• Surface Treatment: Zinc Plated
• Performance Grade: 10.9
• Thread Dia.: #12 (5.5mm)
• Length(not include hex head): 4"(100mm)
• Thread Pitch: 1.8mm
• Hex Head Size: 8x5.4mm / 0.31" x 0.21"(Hex WidthxT)
• Flange Dia.: 11mm / 0.43"
• Washer Size: 16 x 3.5mm / 0.63" x 0.14"(D*T)
• Screw Drilling Range (Plate Thickness): 1.75-5.25mm
• Package Content: 50pcs x Hex Head Self-drilling Screws