Hex Washer Head Self-Drilling Screw (ZR-3#)

Core Advantages

1. Stable Hex Head for High-Torque Installation

The hex head provides firm tool engagement during installation. Depending on the screw diameter, the Across Flats dimension ranges from 7 to 10 mm, providing a stable driving surface for controlled tightening.

2. Efficient #3 Self-Drilling Point

The integrated #3 drill point allows the screw to penetrate suitable metal materials without a separate pre-drilling operation. The available drill point length ranges from 4.5 to 9.0 mm, depending on the screw size.

3. Multiple Sizes for Different Fastening Requirements

This self-drilling screw hex washer head series covers diameters from 4.2 to 6.3 mm and lengths from 19 to 75 mm. The range gives distributors, wholesalers and contractors flexibility when sourcing screws for different metal assemblies.

4. Reliable Surface Contact with EPDM Washer

Selected sizes are available with 14 mm or 16 mm EPDM washers, with a 2 mm washer thickness for applicable configurations. The washer increases contact between the Hex Washer Head Screw and the fastening surface and supports a more stable connection where sealing is required.

Application Scenarios

The Hex Washer Head Self-Drilling Screw is designed for metal fastening applications where installation efficiency and connection stability are important.

Metal roofing and sheet metal installation
Steel frames and metal structures
Metal panels and enclosures
HVAC ductwork
Construction and building components
Industrial metal assembly
Metal-to-metal fastening

OEM / ODM Services

As a direct screw manufacturer, we provide OEM and ODM customization for bulk orders based on customer drawings and technical requirements.

Available customization options include:

• Custom head height
• Custom raw material wire diameter
• Custom EPDM washer thickness

Why Choose Us

1. Integrated R&D, Production, Sales and Service

Founded in 2011, we are a comprehensive hardware enterprise integrating R&D, production, sales, and service. With in-house manufacturing and direct factory supply, we can control quality, cost and lead time more effectively than trading companies.

2. Certified Quality Management System

We hold ISO 9001:2015 certification for our quality management system, covering the production of fasteners. This ensures consistent quality control and reliable production standards for bulk orders.

3. Wide Product Portfolio and Application Coverage

Our products cover construction hardware, furniture hardware, automotive hardware accessories, and precision mechanical parts, widely used in residential construction, commercial facilities, transportation vehicles, electronic equipment, and other industries.

FAQ

Q1: What sizes are available for the Hex Washer Head Self-Drilling Screw (ZR-3#)?

The ZR-3# series is available in 4.2, 4.8, 5.5, and 6.3 mm diameters, with nominal lengths from 19 to 75 mm.

Q2: Can the self-drilling screw hex washer head be supplied with an EPDM washer?

Yes. Selected sizes are available with 14 mm or 16 mm EPDM washers and a 2 mm washer thickness for applicable configurations.

Q3: What OEM customization options are available?

We can customize the head height, raw material wire diameter, and EPDM washer thickness according to customer requirements.

Q4: What are the MOQ and lead time?

The MOQ is 100,000 pieces, and the standard production lead time is approximately 45 days.

（Notes）
1. EPDM metal-rubber composite washer: Unless otherwise specified, the default standard is: Metal sheet thickness 0.50mm (+/-0.1mm), Rubber thickness 2mm (+/-0.2mm).

2. EPDM metal-rubber composite washer standard default: 4.8 series is equipped with 14MM; 5.5 and 6.3 series are equipped with 16mm. Quality is a domestic metal-rubber (ordinary rubber) composite washer.