Hex Head Self-Drilling Screws for Steel, Timber and Roofing Applications

Hex Head Self-Drilling Screws, also known as Hex Head Tek Screws, are designed for fastening steel-to-steel, steel-to-timber, roofing, metal siding, steel trusses, and other sheet metal applications.

SANN MUO Hex Head Self-Drilling Screws feature a specialized self-drilling tip and dual-thread design to improve penetration, fastening efficiency, and connection performance. Different drilling point configurations, including the special No. 1 Point / #1 Tail, are available for different material thicknesses and installation requirements.

The screws can be manufactured in stainless steel, carbon steel, and alloy steel, with customized coatings, washers, head painting, drawings, and samples available.

Hex Head Tek Screws with Dual-Thread Design

Hex Head Self-Drilling Screws are designed to drill and fasten in a single installation operation, eliminating the need for a separate pre-drilled hole in suitable applications.

SANN MUO's design combines a self-drilling point with a dual-thread structure. The different thread sections are designed to support fast penetration and secure fastening after the screw enters the material.

This makes the screws suitable for applications where installation speed, drilling stability, and fastening strength are important.

The current SANN MUO product information identifies steel-to-steel assembly, steel-to-timber fastening, and roofing as key applications.

Hex Head Self-Drilling Screw Specifications

Specification	Available Options
Product Type	Hex Head Self-Drilling Screw / Hex Head Tek Screw
Thread Design	Dual-Thread / Double-Thread Design
Main Applications	Steel-to-Steel, Steel-to-Timber, Roofing
Drilling Point	#1 – #5
Special Point	No. 1 Point / #1 Tail Available
Material	Stainless Steel 304 / 316 / 410; Carbon Steel 1022 / 1018; Alloy Steel 10B21 / 10B33
Gauge	#8 – #14
Metric Size	M4 – M6.3
Length	1/2" – 10"
Metric Length	12 – 250 mm
Head Type	Hex Flange Head / Hex Washer Head
Washer Options	EPDM / PVC / Steel Bonded Washer
Coating	C1 – C4 / Customized Coating
Head Finish	Customized Paint Color Available
Standards	DIN, IFI, ISO, ASTM, ASME
Custom Manufacturing	Available according to customer drawings and samples

Key Features of Hex Head Self-Drilling Screws

Dual-Thread Design for Fast Installation and Secure Fastening

The Hex Head Self-Drilling Screw uses a dual-thread / double-thread design to combine drilling and fastening performance.

The different thread sections are designed to work with the material during installation, helping the screw penetrate efficiently and create a secure connection.

This design is particularly useful for applications where installation time and fastening consistency are important to contractors, manufacturers, and professional installers.

Special Self-Drilling Tip

The screw is equipped with a specialized drilling tip designed to penetrate metal efficiently while reducing the possibility of damaging or breaking the sheet metal.

SANN MUO describes its thread-to-tip design as helping the screw penetrate iron plate while reducing the chance of breaking the plate.

No. 1 Point / #1 Tail Special Screw

A special No. 1 Point / #1 Tail configuration is available within the Hex Head Self-Drilling Screw product range.

The No. 1 point can be selected according to the thickness and type of material being fastened.

For buyers specifying self-drilling screws, the drilling point is an important technical specification because different points are designed for different material thicknesses and drilling requirements.

Nick Point for Faster Drilling

SANN MUO's self-drilling tip incorporates a Nick Point, which is a small indentation positioned slightly to the side of the screw tip.

Testing and feedback from construction workers have indicated that this feature can help shorten drilling time and provide faster drilling performance.

Stable and Slip-Resistant Penetration

The drilling point is designed to provide stable penetration and reduce slipping when starting the screw.

SANN MUO also states that its self-drilling screws can be redrilled multiple times without affecting performance.

Asymmetric Thread for Pull-Out Resistance

The thread design uses different pitches and angles between the upper and lower sections.

This asymmetric thread structure helps create pull-out resistance and allows the screw to firmly clamp gaps between metal plates.

Straight Knurl for Metal Chip Removal

The straight knurl helps expel metal filings during drilling and enlarge the hole without damaging the surrounding material.

It is also designed to help prevent excessive stretching of the screw rod diameter and reduce the risk of corrosion.

Hex Head Options for Self-Drilling Screws

SANN MUO Hex Head Self-Drilling Screws are available in different head configurations according to the application.

Hex Flange Head

The Hex Flange Head provides a wider bearing surface beneath the hex head.

For roofing applications, the screw can be combined with an EPDM or PVC washer to help provide a weather-resistant fastening assembly.

Hex Washer Head

The Hex Washer Head can be combined with an EPDM steel bonded washer.

This configuration is suitable for applications where both fastening and sealing performance are required.

The current product page specifically identifies Hex Flange Head and Hex Washer Head configurations and their corresponding washer options.

Common Applications for Hex Head Self-Drilling Screws

Hex Head Self-Drilling Screws are suitable for:

• Steel-to-steel fastening
• Steel-to-timber fastening
• Roofing
• Metal roofing
• Metal siding
• Steel trusses
• Steel frames
• Thin sheet metal
• Metal panels
• Wall panels
• Fiber laminate panels
• Construction applications

SANN MUO identifies Steel Truss and Metal Siding as common applications and also describes applications involving thin panels, steel frames, and fiber laminates.

Hex Head Self-Drilling Screws for Steel-to-Steel Applications

Hex Head Tek Screws are widely used for joining steel components where the screw must drill through the metal and create the fastening connection in one operation.

The drilling point, thread design, screw diameter, and screw length should be selected according to the thickness and type of steel being joined.

For B2B buyers, specifying the correct drilling point is particularly important when sourcing self-drilling screws for different steel thicknesses.

Hex Head Self-Drilling Screws for Steel-to-Timber Applications

Hex Head Self-Drilling Screws can also be used for steel-to-timber fastening.

These applications involve fastening a metal component or sheet to a timber substrate.

The appropriate screw specification depends on the metal thickness, timber type, screw length, drilling point, and required fastening performance.

For professional installation, buyers should provide the actual material combination and thickness when selecting the appropriate Tek Screw specification.

Hex Head Tek Screws for Roofing

Hex Head Self-Drilling Screws are commonly used for roofing and metal panel applications.

A Hex Flange Head or Hex Washer Head can be combined with the appropriate washer to help prevent water leakage through the fastening point.

Available washer options include:

• EPDM Washer
• PVC Washer
• EPDM Steel Bonded Washer

The current product page specifically identifies roofing as an application and describes EPDM/PVC and steel-bonded washer combinations for water-resistant fastening.

Materials and Size Options

Material

SANN MUO can manufacture Hex Head Self-Drilling Screws using:

• Stainless Steel 304
• Stainless Steel 316
• Stainless Steel 410
• Carbon Steel 1022
• Carbon Steel 1018
• Alloy Steel 10B21
• Alloy Steel 10B33

Material selection can be based on strength, corrosion resistance, application environment, and customer requirements.

Size

Available sizes include:

• Gauge: #8 – #14
• Metric Size: M4 – M6.3
• Length: 1/2" – 10"
• Metric Length: 12 – 250 mm
• Drilling Point: #1 – #5

Coating and Washer Options

SANN MUO can provide different coating and washer configurations according to the application environment.

C1–C4 Coating

Self-drilling screws can be coated according to C1–C4 specifications or customized coating requirements.

Coating selection can be based on:

• Indoor or outdoor installation
• Moisture exposure
• Corrosion requirements
• Roofing environment
• Customer specifications

EPDM, PVC and Steel Bonded Washers

Different washer configurations can be supplied according to the application.

Available options include:

• EPDM Washer
• PVC Washer
• EPDM Steel Bonded Washer

These configurations are particularly relevant to roofing and exterior metal-panel applications where sealing around the fastening point is required.

Customized Painted Head

The screw head can be painted to match the color of the roof or wall.

This allows the fastening hardware to visually integrate with colored roofing and wall panels.

Custom Hex Head Tek Screw Manufacturing

SANN MUO can manufacture Hex Head Self-Drilling Screws according to customer specifications.

Customization can include:

• Screw dimensions
• Material
• Drilling point
• Dual-thread design
• Head configuration
• Washer
• Coating
• Painted head
• Customer drawing
• Customer sample
• Application requirements

Products can be manufactured according to DIN, IFI, ISO, ASTM, ASME, or customer drawings and samples.

For buyers with an existing Tek Screw specification, SANN MUO can evaluate drawings or samples and develop the required product.

B2B Wholesale and Bulk Supply of Hex Head Self-Drilling Screws

SANN MUO provides Hex Head Self-Drilling Screws / Tek Screws for B2B customers requiring consistent specifications and ongoing supply.

Potential customers include:

• Fastener distributors
• Hardware wholesalers
• Roofing suppliers
• Metal siding suppliers
• Construction material suppliers
• Steel structure suppliers
• Building material manufacturers
• Roofing manufacturers
• Industrial buyers
• Overseas importers

Customers can provide required dimensions, material, drilling point, coating, washer requirements, drawings, or samples for product evaluation and quotation.

Frequently Asked Questions About Hex Head Self-Drilling Screws

Q. What are Hex Head Self-Drilling Screws?

Hex Head Self-Drilling Screws, also known as Hex Head Tek Screws, are screws with a hexagonal driving head and a self-drilling point that allows drilling and fastening in one operation.

Q. What are Hex Head Tek Screws used for?

They are commonly used for steel-to-steel fastening, steel-to-timber fastening, roofing, metal siding, steel trusses, and other sheet metal applications.

Q. What is the difference between a Hex Flange Head and a Hex Washer Head?

A Hex Flange Head incorporates a flange beneath the hex head, while a Hex Washer Head is designed to work with a separate washer configuration.

For roofing applications, the appropriate head and washer combination can help provide sealing around the fastening point.

Q. What is the dual-thread design?

The dual-thread design uses different thread sections to support both penetration and fastening performance.

The specific thread geometry can be customized according to the intended application and customer requirements.

Q. What drilling points are available?

The current product range includes #1 through #5 drilling points.

Q. Is there a special No. 1 Point / #1 Tail version?

Yes. A No. 1 Point / #1 Tail configuration is available as a special option within the Hex Head Self-Drilling Screw range.

Q. What is the Nick Point?

The Nick Point is a small indentation positioned slightly to the side of the screw tip. SANN MUO developed this feature to improve drilling efficiency and shorten drilling time.

Q. What is an asymmetric thread?

An asymmetric thread uses different thread angles and pitches between different sections of the screw.

This design is intended to improve pull-out resistance and help clamp gaps between metal plates.

Q. What is the purpose of the straight knurl?

The straight knurl helps expel metal filings and enlarge the drilled hole during installation while helping prevent excessive stretching of the screw rod diameter.

Q. Can Hex Head Self-Drilling Screws be used for roofing?

Yes. Roofing is one of the listed applications. EPDM, PVC, and steel-bonded washer configurations can be supplied according to the roofing application.

Q. Can the screw head be painted?

Yes. The screw head can be painted to match the color of the roof or wall.

Q. What materials are available?

Available materials include Stainless Steel 304, 316, and 410; Carbon Steel 1022 and 1018; and Alloy Steel 10B21 and 10B33.

Q. What sizes are available?

Available sizes range from #8 to #14 and M4 to M6.3, with lengths from 1/2" to 10" and 12 mm to 250 mm.

Q. Can Hex Head Tek Screws be customized?

Yes. SANN MUO can manufacture according to customer drawings, samples, dimensions, materials, drilling points, coatings, washers, and applicable standards.

Q. Does SANN MUO provide wholesale and bulk supply?

Yes. SANN MUO can support B2B customers including fastener distributors, roofing suppliers, construction suppliers, manufacturers, and overseas buyers.

Q. Can overseas buyers purchase Hex Head Tek Screws directly?

Yes. Overseas buyers can provide their required specifications, drawings, samples, or application requirements for product evaluation and quotation.

Q. Can SANN MUO be evaluated as a second-source supplier?

Yes. Companies currently purchasing Tek Screws from local distributors or relying on a single supplier can evaluate SANN MUO as an alternative or second-source manufacturer based on their required specifications and application.