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Hex Washer Head Self Drilling Screws Roofing TEK SCREWS with EPDM Washer


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Product Description

Product Introduction

A self-drilling screw with a hexagonal head and a bonded EPDM washer is a specialized fastener designed to drill its own hole, create its own threads, and provide a watertight seal in one operation, eliminating the need for a pilot hole. The hexagonal head allows for easy driving with a wrench or socket, while the EPDM washer is bonded to the underside of the washer to prevent leaks, resist loosening, and protect the surrounding material. The self-drilling point acts like a drill bit, penetrating metal and other materials before the threading begins.

Product Advantage

1. Galvanized surface , high brightness, strong corrosion resistance.

2. Carburize tempering treatment, high surface hardness.

3. Advanced technology, high locking performance.

Technical Parameters

Item	Hex Washer Head Self Drilling Screw With Epdm Washer
Size	ST 2.9/3.5/3.9/4.2/4.8/5.5/6.3
Length	6-100mm
Material	Stainless Steel 304/316/410, Carbon Steel, Alloy Steel
Surface	Passivation, Plain,Galvanized, Nickel Plated, Black Oxide
Packaging	Carton Box / Bag +Pallet
Standard	DIN, GB, ATSM/ANSI, JIS, BSW, ISO
Delivery Time	15-30 days
OEM	Available

Product Uses

Metal Roofing and Siding: Attaching metal roofing and siding materials to wooden or metal substrates where a secure, watertight seal is essential.

Exterior and Outdoor Projects: Ideal for any outdoor application requiring a weather-resistant, durable fastener, such as building carports, sheds, or fastening components to exterior walls.

HVAC and Ductwork: Securing metal and plastic components for HVAC systems and ductwork.

Automotive and Mechanical Assembly: Used in vehicle assembly and for fastening metal components in machinery and equipment where durability is needed.

Electrical Projects: Securing electrical enclosures and mounting components to metal surfaces.

Steel Frame Construction: Fastening brackets, cladding, and steel sections to other steel components.

Product Operate Guide

1. Select the Right Screw

Material Compatibility:

Ensure the screw is designed for the material you are fastening (usually metal) and that its drill point length is sufficient to penetrate all materials involved.

Sealing Function:

The bonded EPDM washer is critical for providing a watertight seal and protecting the mating surface, preventing leaks and loosening.

2. Prepare for Installation

Mark Placement: Identify and mark the exact location where the screw will be installed.

Use a Nut Driver/Socket: Load the screw's hexagonal head into the correct size nut driver or socket bit for your drill or driver.

3. Position and Drive the Screw

Apply Pressure:

Place the pointed end of the screw on the marked spot and apply consistent, firm downward pressure to help the drill point engage with the material.

Drive the Screw:

Start the drill and allow the screw's drill point to cut through the material, creating its own hole.

The screw then taps its own threads, creating a strong fastening.

Achieve Proper Sealing:

Continue driving the screw until the EPDM washer creates a firm, reliable seal against the surface. Avoid over-compressing the washer, which can reduce its sealing effectiveness.

4. Final Check

Verify Alignment and Seal: Ensure the screw is straight and the washer is creating a watertight seal to prevent leaks

FAQ

Q: Are Self-Drilling Screw and Tek Screws the Same?

A: Yes, Self-Drilling Screws and Tek Screws are terms often used interchangeably.

Q: How Do Self-Drilling Screws Differ from Self-Tapping Screws?

A: Self-drilling screws have a drill point that eliminates the need for a pilot hole, whereas self-tapping screws require a pre-drilled hole in hard materials.

Q: How Do I Select the Right Screw Size?

A: Choose screw size based on material thickness and project requirements.

Q: Can Self-Drilling Screw Be Reused?

A: While they can be removed it is not recommended to use Self-Drilling Screw more than once.

Q: Are Self-Drilling Screw Suitable for Outdoor Use?

A: Yes, but opt for corrosion-resistant finishes such as stainless steel or galvanised finishes for long-term durability in outdoor environments.