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Hex Washer Head Self-Drilling Screw (ZR-1#)

Home / Products / Hex Washer Head Screws / Hex Washer Head Self-Drilling Screw (ZR-1#)
  • Ningbo Zhenrui Hardware Industrial Co., Ltd.
  • Ningbo Zhenrui Hardware Industrial Co., Ltd.
  • Ningbo Zhenrui Hardware Industrial Co., Ltd.
  • Ningbo Zhenrui Hardware Industrial Co., Ltd.
  • Ningbo Zhenrui Hardware Industrial Co., Ltd.
  • Ningbo Zhenrui Hardware Industrial Co., Ltd.

Hex Washer Head Self-Drilling Screw (ZR-1#)

Product Introduction

Hex Washer Head Self-Drilling Screw (ZR-1#) is a factory-manufactured fastening solution for metal-to-metal applications, combining a hex washer head with self-drilling points for fast installation and stable connections.

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Core Advantages Application Scenarios OEM / ODM Services Why Choose Us FAQ Technical Parameters Inquiry Form

Core Advantages

1. High-Torque Hex Head

The hex head self-drilling screw design provides a stable tool engagement surface for efficient installation and controlled tightening. Across-flats dimensions range from 7 to 10 mm, depending on screw size, making the self-drilling screw hex washer head configuration suitable for metal fastening applications requiring reliable torque transfer.

2. Efficient Self-Drilling Installation

The integrated drilling point enables the hex head self-drilling screw to penetrate suitable metal substrates before forming the threaded connection, helping streamline installation by reducing the need for separate drilling operations. Drill point lengths range from 4.0 to 9.0 mm, depending on screw size and configuration.

3. Flexible Size Selection

The Hex Washer Head Screw range covers screw diameters from 4.2 to 6.3 mm and nominal lengths from 19 to 75 mm. This range gives distributors, wholesalers, and contractors greater flexibility when selecting a self-drilling screw hex washer head for different sheet metal, roofing, and structural fastening requirements.

4. Stable Sealing and Connection

Selected Hex Washer Head Screw models are available with 14 mm or 16 mm EPDM washers, with a 2 mm EPDM washer configuration available for applicable models. The washer provides broader surface contact and helps support connection stability and sealing performance in applications where moisture protection is required.

Application Scenarios

The Hex Washer Head Self-Drilling Screw is designed for fast metal fastening and is suitable for a variety of construction and industrial applications.

Metal roofing and sheet metal installation
Steel frames and metal structures
Metal panels and enclosures
HVAC ductwork
Building and construction components
Light industrial assembly
Metal-to-metal fastening

OEM / ODM Services

As a screw manufacturer with in-house production, we provide OEM and ODM customization for bulk orders according to customer requirements.

Available customization options include:

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

Customized specifications can be produced according to customer drawings, technical requirements, and agreed production standards.

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 size options are available for the Hex Washer Head Self-Drilling Screw (ZR-1#)?

Available screw diameters are 4.2, 4.8, 5.5, and 6.3 mm, with nominal lengths from 19 to 75 mm.

Q2: Which drill point options are available?

The hex head self-drilling screw includes #1 and #3 drill points, depending on the screw diameter and configuration.

Q3: Can the self-drilling screw hex washer head be supplied with EPDM washers?

Yes. Selected specifications can be supplied with 14 mm or 16 mm EPDM washers, with a 2 mm washer thickness for applicable configurations.

Q4: What can be customized for OEM orders?

We can customize head height, raw material wire diameter, and EPDM washer thickness according to bulk-order requirements.

Q5: What is the MOQ and lead time?

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

SIZE S (Across Flats) dc (Head Dia.) C (Head Thick.) K (Head Height) e (Across Corners) P (Pitch) d1 (Major Dia.) d2 (Minor Dia.) drilling no. y (Drill Point Length) dp (Drill Point Dia.) EPDM (Washer)
4.2*L MAX 7 8.60  0.95  3.95  / 1.41  4.20  3.10  3# 6.00  3.60  / METAL THICKNESS 0.5MM
EPDM 2MM
MIN 6.75 8.30  0.70  3.60  7.20  4.08  2.90  4.50  3.50 
4.8*L MAX 8.00  10.60  1.00  4.70  / 2.12  4.80  3.40  1# 5.00  3.15  14MM
MIN 7.75 10.00  0.80  4.40  8.87  4.65  3.10  4.00  2.90 
4.8*L MAX 8.00  10.60  1.00  4.70  / 1.59  4.80  3.40  3# 7.50  4.20  14MM
MIN 7.75 10.00  0.80  4.40  8.87  4.65  3.10  6.00  4.00 
5.5*L MAX 8.00  11.00  1.00  5.10  / 1.81  5.46  3.80  3# 8.00  4.70  16MM
MIN 7.75 10.00  0.80  4.60  8.87  5.25  3.60  7.00  4.55 
6.3*L MAX 10.00  13.00  1.20  5.90  / 1.81  6.30  4.60  3# 9.00  5.60  16MM
MIN 9.75 12.00  0.90  5.20  11.25  6.05  4.30  7.50  5.40 
Length Comparison Table
length 19 25 32 38 50 63 75
L 18-19 23.5-25 30.6-32 36.5-38 48.5-50 61.5-63.5 73.5-76

MOQ 100,000 pcs
Lead Time 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.

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About Us
Ningbo Zhenrui Hardware Industrial Co., Ltd.

Founded in 2011, we are a comprehensive hardware enterprise integrating R&D, production, sales, and services. Since our establishment, we have adhered to the philosophy of "Innovation-driven, Customer-oriented, Integrity for Win-Win Cooperation". Focused on manufacturing, we are committed to supplying high-quality products to customers. With years of steady development, we have grown into an influential player in the industry.

Our product portfolio covers construction hardware, furniture hardware, automotive hardware accessories, and precision mechanical parts, widely used in residential construction, commercial facilities, transportation vehicles, electronic equipment, and many other industries. By introducing advanced production equipment and technologies, along with a strict quality control system, we ensure that every product meets or exceeds customer expectations.

We advocate a people-oriented corporate culture, value employees’ growth and well-being, and foster a harmonious work environment. The company has formulated basic management systems in accordance with laws. Currently, we are steadily advancing toward group-based, specialized, and international development.

Certificate Of Honor
  • Certificate of Utility Model Patent
  • Quality Management System Certificate
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