Hex Head Self Drilling Screws

Stop Pre-Drilling. Save Hours, Secure Instantly.

Extreme Grip, Zero Failures. Trust the Heavy-Duty Spec.

One-Step Sealing Power. Watertight, Rust-Fighting, Built Strong.

SINSUN Hex Head Self-Drilling Screws: The Professional's Choice for Fast, Strong, and Reliable Fastening

SINSUN supplies professional-grade hex washer head self-drilling screws for metal construction, roofing & fabrication. Durable, corrosion-resistant, high-torque fasteners in multiple sizes. Request specs & quote today.

Product Overview & Classifications

The SINSUN Hex Washer Head Self-Drilling Screw is a versatile, high-performance fastener characterized by a hexagonal head combined with an integral flat washer (flange) and a drill-pointed tip. This design is purpose-built for joining metal to metal, wood to metal, and various composite materials.

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hex self drilling screw By Drive Method

Hex Washer Head (External Hex Drive) Self-Drilling Screws

This is the standard and overwhelmingly common type. The head features an external hexagon (six-sided) shape combined with an integral flange. It is designed for high-torque installation using wrenches, sockets, or nut drivers, providing a secure, non-slip fastening ideal for structural applications.

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Phillips Drive Hex Head TEK Screws

SINSUN fasteners have a Phillips drive recess and a head shape that resembles a hexagon. This dual-system design is flexible: the hex head allows a wrench to be useto ighten or loosen things with a lot of torque, and the Phillips drive lets you use regular power drills to install things faster. They work well in situations where the final clamping force is very important, but getting to a socket wrench may be difficult during the first drilling phase. The wide range of applications they can perform includes HVAC, electrical, and maintenance.

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Slotted Drive Hex Head Self-Drilling Screws

In this design, a traditional single-slot drive is built into a hexagonal head, making it ideal for niche applications. The slotted drive works with the most basic tools, and the hex head shoulders allow a wrench to apply more torque if needed. However, the slotted recess can easily cam out when there is a lot of driving force, and it does not engage as well as modern drives. The screws are typically used for low-torque assembly, maintenance of old equipment, or when basic flat-blade tools are unavailable.

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By Washer Type

Hex Self Drilling Screw with EPDM Bonded Washer

The hex self-drilling screws from Sinsun come with an EPDM washer that is factory-bonded to the screw. This creates a permanent, watertight seal when the screw is installed. The EPDM material is much better at withstanding weathering, ozone, and UV exposure over time. This design is intended to prevent metal roofing and siding from leaking and rusting. It offers a dependable, no-maintenance sealing solution for buildings outside.

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Hex Head TEK Screws with Gray EPDM Bonded Washer

These screws have a standard hex head and a gray EPDM washer that is bonded to the screw for the best weather sealing. The gray color provides a finish that is neutral and hard to see on most surfaces. The EPDM component ensures that the material can recover from being compressed and remains stable in heat. For HVAC, ductwork, and outdoor metal assemblies, they are the best choice for sealed fastenings.

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Hex Head Self Drilling Screw with Transparent PVC Washer

This version has a clear PVC washer that lets you fasten it in a way that doesn't show, which is great for when looks are important. The PVC material makes a good seal against moisture and a lot of chemicals. The clear material makes sure that the head of the fastener stays clean and doesn't stand out. It works best for attaching trim and panels that are see-through or light in color.

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Hex SDS with White PVC Washer

This screw comes with a white PVC washer that makes it easy to match the color of white or light-colored surfaces. It also makes a tight seal. The PVC washer does not rust when it gets wet, and it makes a good gasket. The material is commonly used for clean and bright appliances, electrical enclosures, and architectural panels.

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Hexagon Head Self Drilling Screws with Black...

These screws are equipped with a black PVC washer, suitable for creating a sealed fastener point with a dark, low-profile look. The black PVC is resistant to many environmental factors and provides consistent performance. It is an effective solution for automotive, signage, and dark metal panel applications where visual blend is desired.

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Hexagon Self Drilling Screw with Rubber Washer

This model uses a standard rubber washer to seal things up and keep them from vibrating. The rubber washer is a cheap way to keep moisture out and is easy to compress. It works well indoors, for light outdoor use, or when you need to block out noise and vibration a little bit.

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Neoprene/EPDM Washer Hexagon Head Self...

Featuring a high-quality Neoprene/EPDM washer, Sinsun's screws offer a versatile sealing solution. This compound washer combines the oil and chemical resistance of neoprene with the superior weathering and temperature stability of EPDM. This seal is designed to withstand high temperatures and harsh conditions, including exposure to fuel, oils, or wide temperature fluctuations. Ideal for automotive, industrial, and specific roofing applications where enhanced fluid resistance is required.

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Hex Self Drilling Screw with Saddle Washer

Designed for securing corrugated or trapezoidal metal roofing and cladding, this screw features a contoured saddle washer. This washer has a precise base profile that matches the panel ribs, ensuring a stable connection and preventing water penetration.This design prevents metal distortion, reduces stress concentrations, and ensures a leak-proof fastening point across the panel's high ribs.The professional choice for profiled sheet metal roofs that require long-term, reliable performance.

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Galvanized Hex Head Screws with EPDM Washer

Hot Rust Guard hexagon self drilling screw

Stainless Steel Hex Head self drilling screw

By Material & Coating (For Corrosion Resistance)

Carbon Steel with Zinc Plating: A cost-effective, general-purpose option with good corrosion resistance for standard applications.

Weather-Resistant Coated (Dacromet, Hot Rust Guard, Galvanized): Enhanced protection for outdoor exposure. Ideal for metal roofing, cladding, and fencing.

Stainless Steel Options (stainless steel hex head self drilling screws): For maximum corrosion resistance in harsh environments.

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By Drill Point & Thread Design

Standard Point (SP): For lighter gauge materials.

Fine Thread: Provides better performance in brittle materials and reduced stripping.

Coarse Thread: Offers faster driving and superior holding power in wood and softer substrates.

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Technical Parameters of self drilling screw hex washer head

Feature	Specification / Description
Head Style	Hex Washer Head (Hex Flange)
Drive Type	External Hex (6-point), suitable for high-torque driving
Point Type	Self-Drilling Point (various lengths for material thickness)
Thread Type	Coarse or Fine thread options available
Material	High-Carbon Steel, Low-Carbon Steel, available in Stainless Steel
Surface Finish	Zinc Plated (standard), Color Coated (Gevin/Organic coatings), Plain
Common Diameters	#8，#10，#12，#14
Common Lengths	Ranges from 3/4" to 6" (depending on diameter and application)
Primary Functions	Drilling, Tapping, and Fastening in a single operation
Typical Substrates	Sheet Metal, Steel Framing (up to specified gauges), Aluminum, Wood

Hex Washer Head Self-Drilling Screws Technical Data Sheet

Diameter (Gauge/Metric)	Shank Diameter (d)	Common Length Range (L)	Standard Lengths (mm)	Max. Length (mm)	Drill Point (TEK) No.	Material Thickness Capacity (Steel, approx.)	Head / Washer Dimensions	Hex Key Size
#8 / ST4.2	4.2 mm	12 - 50mm	12, 16, 19, 22, 25, 32, 38, 45,	Up to 50	#3	Up to 3.0 mm	Washer OD: ~14 mm	7 mm (1/4")
#10 / ST4.8	4.8 mm	12 - 100 mm	12, 16, 19, 22, 25, 32, 38, 45, 50, 63, 75, 89, 100	Up to 200	#4	Up to 4.5 mm	Washer OD: ~16 mm	8 mm (5/16")
#12 / ST5.5	5.5 mm	19 - 150 mm	19, 25, 32, 38, 41, 50, 63, 75, 89, 100, 127, 150	Up to 250	#5	Up to 6.0 mm	Washer OD: ~19 mm	8 mm (5/16")
#14 / ST6.3	6.3 mm	19 - 200 mm	19, 25, 32, 38, 41, 50, 63, 75, 89, 100, 127, 150, 200	Up to 250+	#5	Up to 8.0 mm	Washer OD: ~22 mm	10 mm (3/8")

Note:

The lengths and capacities listed are based on standard industrial specifications (e.g., DIN 7504K, ASTM). Actual product offerings from Sinsun may vary. For custom or extreme-length screws, contacting the manufacturer directly is essential.

Installation & Selection of Keys

Length Selection Rule: The screw length should beat least 10 mm longer than the total thickness of the materials being fastened. The drill point will fully penetrate and the threads will be sufficiently engaged. The minimum screw size for fastening a 50mm purlin is 60mm.

Sealing Options (Washers): Sealing washers must be specified when outdoor applications are being used.

Standard Options Include

EPDM Bonded Washer: For general weatherproofing.

BAZ Washer (Fiber Cement): For brittle materials.

Saddle Washer (for Corrugated Panels): For profiled metal sheets.

Primary Applications & Uses

Tool: Use a high-torque hex-drive impact wrench or drill.

Speed & Torque: Drive the washer at medium speed and apply firm pressure until it is fully compressed and sealed.Don't overdrill the threads, as it may strip the threads or damage the drill point.

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Primary Applications & Uses

These screws are the go-to fastener for industries where speed, strength, and reliability are critical

Metal Building Construction: Fastening steel framing, purlins, girts, and light structural components.

Roofing & Siding Installation: Securing corrugated metal roofing panels, trim, flashings, and siding sheets. The washer head provides an excellent seal against water ingress.

HVAC & Ductwork: Assembling and mounting ducting, supports, and equipment.

Fencing, Railings & Decking: Installing metal picket fences, post brackets, and composite decking to metal frames.

General Fabrication & Repair: A versatile solution for workshops, maintenance teams, and metal fabricators.

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Why Specify SINSUN Hex Washer Head Self-Drilling Screws?

Engineered for
Efficiency

The self-starting drill point eliminates pre-drilling, reducing labor time and tooling changes by a substantial amount.
High-Torque
Installation

The hex washer head allows for powerful driving with standard sockets, impact wrenches, or nut drivers, ensuring a tight, secure fit without cam-out.
Secure, Vibration-
Resistant Hold

The wide flange distributes the load, minimizes material pull-through, and creates a weather-resistant seal.
Built for Durability

Made of high-quality steel and plated with protective coatings to prevent corrosion and weathering.
Consistent Quality

Rigorous quality checks guarantee uniform dimensions, hardness, and performance, batch after batch.
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Customer feedback

We have consistently used Sinsun's Hex Head Self Drilling Screws in our steel structure projects in Saudi Arabia. Their hexagonal head design facilitates easy installation with a wrench, delivering high torque without slipping. When securing thick steel plates, the self-drilling feature eliminates the need for pre-drilling, saving significant labor hours. Compared to round-head screws, they offer greater reliability in high-strength connections.

Mike Reynolds Project Manager at Elite Kitchen Designs Inc

The Sinsun Hex Head TEK Screws supplied for installing color-coated steel panels at our Australian warehouse are of excellent quality. The drill point is exceptionally sharp, easily penetrating double-layer steel sheets. The hex head drive system is highly efficient, and our power tools engage perfectly without stripping the screw heads. Clear labeling on the packaging facilitates easy on-site retrieval.

David Chen Site Supervisor at Pacific Timber Builders LLC

(For a metal roofing project in the UK) Hex-head self-drilling screws with washers are standard equipment for roofing projects. The washers create an effective seal when tightened, preventing leaks. The self-drilling feature avoids secondary damage to the roof panels, resulting in a neat appearance after installation. After enduring several storms, no water seepage has occurred at the joints.

James Wilson Project Manager at Cityscape Renovations Ltd.

At construction sites in Singapore, we've used Sinsun's Hex Self Drilling Screw to install ventilation ducts, cable trays, and light steel studs. It's highly versatile with consistent quality. It works well with both manual and power tools, offering excellent self-drilling performance—particularly efficient on thin-walled materials. It's one of our go-to fasteners on the job site.

James Wilson Project Manager at Cityscape Renovations Ltd.

Our chemical plant project in coastal India requires the use of Stainless Steel Hex Head Self Drilling Screws. Sinsun's screws demonstrate truly outstanding corrosion resistance, showing no signs of rust even after prolonged use in a salty air environment. Although the cost is higher, this investment is worthwhile for long-term corrosion safety and reduced maintenance. The mechanical strength also fully meets the requirements.

James Wilson Project Manager at Cityscape Renovations Ltd.

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Hex Head Self Drilling Screws

SINSUN Hex Head Self-Drilling Screws: The Professional's Choice for Fast, Strong, and Reliable Fastening

Product Overview & Classifications

hex self drilling screw By Drive Method