Material: C1022A, SUS410, SUS304, SUS316

Specification: ST3.5, ST3.9, ST4.2, ST4.8, ST5.5, ST6.3, 6#, 7#, 8#, 10#, 12# , 14#,1/4"

Surface Treatment: Passivated, Galvanized, Nickel-plated, Blackened, Head sprayed, Dacromet, Hot Rust, Rasputin

Product Introduction

Other Head Types Self-Drilling Screws encompass a range of fastener configurations designed for metal-to-metal fastening applications requiring specialized head geometries. These screws incorporate a self-drilling point that drills and taps threads simultaneously, eliminating the need for pilot hole preparation. Available in a range of head configurations including truss, oval, flat, and other custom profiles, these screws provide application-specific solutions for diverse installation requirements. Manufactured from carbon steel (C1022A) and stainless steel (SUS410, SUS304, SUS316) material options, the screws offer strength and corrosion resistance for various environments. Multiple surface treatments including passivated, galvanized, nickel-plated, blackened, and Dacromet finishes provide environmental adaptability. Metric sizes from ST3.5 to ST6.3 and imperial sizes from 6# to 1/4" accommodate comprehensive application needs.

Core Advantages

Multiple Head Configurations

Truss, oval, flat, and other custom head profiles provide application-specific solutions for diverse installation requirements.

Self-Drilling Point

Drills and taps threads in a single operation, eliminating pilot hole requirements and reducing installation time.

Multiple Material Options

Available in carbon steel (C1022A) and stainless steel (SUS410, SUS304, SUS316) to meet diverse application requirements.

Wide Specification Range

Metric sizes from ST3.5 to ST6.3 and imperial sizes from 6# to 1/4" for comprehensive application coverage.

Extensive Surface Treatments

Passivated, galvanized, nickel-plated, blackened, Dacromet, and hot rust finishes for environmental adaptability.

Custom Head Solutions

Specialized head profiles available for applications with specific clearance, appearance, or functional requirements.

Product Features

Multiple head configurations Truss head provides larger bearing surface; oval head offers low-profile appearance; flat head enables flush mounting; custom profiles available for specific applications.

Self-drilling point design Drill point penetrates and threads metal substrates without pre-drilling, compatible with metal-to-metal fastening applications.

Carbon steel material C1022A grade offers strength for general metal fastening applications with appropriate surface treatment.

Stainless steel material options SUS410 provides hardness, SUS304 offers general corrosion resistance, and SUS316 delivers marine-grade protection.

Metric specification range Available in ST3.5, ST3.9, ST4.2, ST4.8, ST5.5, and ST6.3 diameters for diverse thread size requirements.

Imperial specification range Available in 6#, 7#, 8#, 10#, 12#, 14#, and 1/4" sizes for North American standard applications.

Surface treatment options Galvanized and passivated finishes provide general corrosion protection; nickel-plated offers enhanced appearance; blackened delivers aesthetic matte finish; Dacromet provides high salt spray resistance.

Application Scenarios

Sheet metal assemblies

Equipment enclosures

Electronics chassis

HVAC duct connections

Furniture construction

Architectural metalwork

Automotive components

Industrial machinery

This range of self-drilling screws with alternative head types is deployed in applications requiring specialized head geometries for specific installation requirements. Truss head screws provide larger bearing surfaces for soft materials; oval head screws offer low-profile aesthetics for visible applications; flat head screws enable flush mounting with countersunk holes; custom head profiles accommodate unique clearance, appearance, or functional requirements in sheet metal assemblies, equipment enclosures, electronics chassis, furniture construction, architectural metalwork, automotive components, and industrial machinery.

Common Questions and Solutions

How do I select the correct head type for my application?

Consider clearance requirements, appearance, bearing surface needs, and installation tool access. Truss heads provide larger bearing surfaces, oval heads offer low profiles, flat heads enable flush mounting, and other custom profiles address specific application requirements. Consult the product catalog for head style selection guidance.

What is the difference between carbon steel and stainless steel options?

Carbon steel (C1022A) provides high strength for general applications and is typically used with corrosion-resistant coatings. Stainless steel (SUS410) offers hardness for structural applications, SUS304 provides general corrosion resistance, and SUS316 delivers superior marine-grade protection for harsh environments.

What surface treatment provides the best corrosion protection?

Dacromet coating provides the highest salt spray resistance, with tests reaching up to 1000 hours. Hot-dip galvanizing offers corrosion resistance for outdoor structural applications. For stainless steel fasteners, passivation treatment enhances the natural oxide layer for improved corrosion resistance.

Can these screws be used with aluminum substrates?

Yes, but consider galvanic compatibility. Zinc-plated carbon steel screws can create galvanic corrosion with aluminum in certain environments. Specialized coatings or stainless steel options are recommended for long-term aluminum-to-metal applications.

What are the applications for truss head self-drilling screws?

Truss head screws provide a larger bearing surface than standard pan or hex heads, making them suitable for fastening softer materials such as thin sheet metal, plastics, or materials that benefit from distributed clamping force to prevent deformation.

What are the applications for flat head self-drilling screws?

Flat head screws are designed for flush mounting with countersunk holes. They are used in applications requiring a smooth surface finish, such as architectural metalwork, equipment enclosures, and furniture where protrusions would interfere with appearance or functionality.

Installation Considerations

Select drill point length appropriate for material thickness to ensure proper thread engagement and secure fastening for the selected head type.

Use the appropriate drive tool for the selected head configuration. Different head types require specific driver bits for proper engagement.

For flat head screws, ensure the countersink angle matches the screw head angle (typically 82-degree or 90-degree) for proper seating and flush mounting.

Use torque-controlled installation tools to prevent over-driving. The head should seat against the workpiece surface without damaging the head or surrounding material.

Apply appropriate spindle speed based on screw diameter and material hardness; excessive speed may reduce drill point life and cause thermal damage to coatings.

For outdoor applications requiring extended corrosion resistance, specify Dacromet, hot-dip galvanized, or stainless steel materials based on environmental exposure conditions and head type selection.