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 Sharp Point Self-Tapping Screws encompass a range of fastener configurations designed for metal fastening applications requiring specialized head geometries with secure thread engagement in pre-drilled holes. Available in a variety of head configurations including truss, oval, flat, and other custom profiles, these screws provide application-specific solutions for diverse installation requirements. The sharp point design enables precise alignment and entry into pilot holes, facilitating consistent thread formation during installation. These screws cut mating threads in pre-drilled holes, providing secure engagement without requiring a separate tapping operation. 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.

Sharp Point Design

Precise alignment and entry into pilot holes enables consistent thread formation during installation.

Self-Tapping Thread

Cuts mating threads in pre-drilled holes, providing secure engagement without requiring a separate tapping operation.

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.

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.

Sharp point design Precise alignment and entry into pilot holes enables consistent thread formation for secure fastening in metal substrates.

Self-tapping thread Cuts mating threads in pre-drilled holes, providing secure engagement without requiring a separate tapping operation.

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

Furniture construction

Architectural metalwork

Automotive components

Industrial machinery

Custom metal fabrications

This range of sharp point self-tapping screws with alternative head types is deployed in metal fastening applications requiring specialized head geometries with secure thread engagement in pre-drilled holes. 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, industrial machinery, and custom metal fabrications.

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.

How do I select the correct pilot hole size for these screws?

Pilot hole size varies based on screw diameter and material hardness. Refer to the technical datasheet for recommended pilot hole diameters for each specification to ensure proper thread engagement and prevent material damage or thread stripping.

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

Truss head screws provide a larger bearing surface than standard pan or flat 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-tapping 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.

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.

What is the recommended installation speed for these screws?

Install at controlled speeds to prevent thread galling and ensure proper thread formation. Use torque-controlled drivers to prevent over-tightening when the head seats against the workpiece surface. Excessive speed may cause thread damage or material overheating.

Installation Considerations

Drill pilot holes to the recommended diameter for the specific screw size and material thickness to ensure proper thread engagement.

Select 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 to prevent thread galling; excessive speed may cause thread damage or thermal buildup.

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.