Top 10 Self Tapping Screws With Rubber Washer

Metal to metal screws are sealing self-drilling tapping screws made from C1022 steel, case hardened for roofing and siding applications. The screw drills its own hole, forms mating threads and makes a complete secure fastening in a single operation. Acorn International metal to metal screws have a #3 drill point for fastening sheets to purlins up to 1/4" total thickness with no predrilling. #12-14 screws are 5/16" across flats hex washer head and #14-14 screws are 3/8" across flats hex washer head with assembled EPDM washer for easy driving and conformance to the metal surface for a secure and long-lasting seal. All screws are 1,000 hour salt spray test dacro coated. Colored screws are powder coated over the dacro base coating. All Acorn International screws are packed 250 pieces in a heavy duty tear-off resealable bag, UPC coded and retail ready. All bag and carton labels are trilingual. Cartons are heavy duty cardboard of uniform size and distinctive yellow color for better retail identity.

Unlike tapping screws, these screws drill a hole and tap a thread in a single operation. All you need to install them is a power driver. For effective fastening, the drilling point must fully penetrate all pieces of material being fastened before the first thread engages. The washer and hex head are formed together as one piece. The underside of the head provides a large flat bearing surface that reduces the likelihood of crushing mating surfaces. When you drive this screw, a flexible black EPDM rubber washer bonded to a metal washer compresses, forming a tight seal. Ideal for metal structures and assemblies. Head height includes compressible washer. Length is measured from under washer. Fully threaded.

Steels are designated by a 4 number SAE Steel grade.  The first two digits indicate the primary materials used to form the steel.  The last 2 digits identify the percentage of carbon for the alloy (in hundredths).  The steel used in these fasteners has a tensile strength ranging from 100,000 to 150,000 psi (pounds per square inch).  Zinc Plating helps to prevent corrosion.

Hex head fasteners can be driven with simple wrenches, and require minimal clearance above the fastener because they can be driven or loosened from the side.

A Zinc Coated Steel hex washer head tapping screw with spaced threads and a drill point which drills its own hole. Beneath the head is a conically shaped circular steel washer, bonded to a similarly shaped rubber-like (neoprene) piece which has a slightly smaller outside and inside diamter. When these washers are assembled (rubber side down) to self-drilling screws, those fasteners become “sealing screws”. When properly assembled, this washer: (a) offers protection against leakage; (b) provides load bearing qualities superior to that of a regular flat washer; (c) reduces the chance of the fastening becoming loose due to vibration; (d) minimizes damage to the mating surface caused by contact with a steel washer. Sealing screws may be used to attach roofing or metal walls to steel frames. Consult a self-drilling screw selection chart for the correct size. Self-drilling screws offer economical benefits: reduces labor and tooling costs; reduces or eliminates drill bits and taps. Type BSD Thread Pitch: May be used to attach plywood, soft woods or composition board to metal, or attach metal to metal. Tek screws, also known as self-drilling screws or self-tapping fasteners, are fairly common pieces of hardware. Aside from the drill tip of the screw, Tek screws look like standard screws. The tip of a Tek screw, known as the drill tip, includes a small carving piece at the end of the screw. This piece is used to establish a small hole in applications by first tapping the screw against the application before driving it in. This provides a better starting point for drilling the screw. It also saves time by eliminating the need to drill a hole before installing a screw or waiting for thread to catch. Tek screws are commonly used in the electrical industry. Typically, these screws are used in metal-to-metal and metal-to-wood applications. The most common are used in thin metal applications such as working with steel studs.

12″ x 1″, zinc plated, hex head, roofing screw with washers.

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