Specification: ST4.8-16*50

Material: SUS410

Surface Treatment: Black Dacromet

Single weight：4.89

Product Introduction

The Pan Head Torx Anti-Theft Self-Drilling Screw is designed for metal fastening applications requiring enhanced security and positive drive engagement. The pan head configuration provides a flat underside for accurate clamping force distribution, while the Torx drive enables positive torque transmission with reduced cam-out risk during installation. The anti-theft feature incorporates a specialized drive profile that requires a dedicated tool for installation and removal, providing security against unauthorized tampering. The self-drilling point drills and taps threads simultaneously, eliminating pilot hole requirements and reducing assembly time. Manufactured from SUS410 stainless steel with black Dacromet surface treatment, this screw provides hardness and corrosion resistance for demanding environments. The ST4.8-16 thread specification with 50mm length offers engagement for structural connections and heavy-duty metal assemblies.

Core Advantages

Torx Drive with Anti-Theft Feature

Positive torque transmission with reduced cam-out risk and specialized drive requiring dedicated tool for enhanced security.

Pan Head Configuration

Flat underside provides accurate clamping force distribution when securing brackets, fittings, and metal components.

Self-Drilling Point

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

SUS410 Stainless Steel

Provides hardness for metal fastening applications with corrosion resistance for demanding environments.

Black Dacromet Coating

Provides high corrosion resistance with extended salt spray protection and a matte black aesthetic finish.

Extended Length

50mm length provides extended reach for thicker material stacks and structural connections.

Product Features

Torx anti-theft drive Specialized drive profile requires dedicated tool for installation and removal, providing security against unauthorized tampering.

Pan head configuration Flat underside provides accurate clamping pressure for brackets, fittings, and structural connections in metal assembly.

Self-drilling point Drills and taps threads simultaneously, eliminating pilot hole drilling and reducing installation steps.

SUS410 stainless steel material Provides hardness for metal fastening applications with corrosion resistance for demanding environments.

Black Dacromet surface treatment Offers high corrosion resistance with salt spray protection and a matte black aesthetic finish suitable for outdoor and industrial applications.

ST4.8-16 thread specification Standardized thread configuration provides consistent performance for structural connections and heavy-duty metal assemblies.

50mm length Extended length provides engagement for thicker material stacks and structural connections.

Application Scenarios

Security-sensitive structures

Public infrastructure

Telecommunications equipment

Outdoor metal assemblies

Transportation systems

Industrial equipment

Building facades

Heavy-duty metal connections

This pan head Torx anti-theft self-drilling screw is deployed in applications requiring enhanced security against unauthorized tampering or removal. Applications include security-sensitive structures, public infrastructure where fastener security is critical, telecommunications equipment cabinets, outdoor metal assemblies, transportation systems, industrial equipment requiring tamper-resistant fasteners, building facades, and heavy-duty metal connections where the Torx anti-theft drive provides security and the black Dacromet coating ensures long-term corrosion protection.

Common Questions and Solutions

How does the anti-theft feature work?

The anti-theft feature incorporates a specialized Torx drive profile with a unique pin or center post that prevents standard Torx drivers from engaging. A dedicated security Torx tool with a corresponding hole or recess is required for both installation and removal, providing protection against unauthorized access.

What tool is required for installation and removal?

A dedicated security Torx driver matching the specific drive profile is required. Standard Torx drivers will not engage due to the anti-theft pin or post in the center of the drive. Consult the product specification for the exact security Torx size.

What material thickness can the ST4.8-16*50 screw accommodate?

The ST4.8-16 specification with 50mm length provides engagement for thicker material assemblies and structural connections. The actual maximum material thickness depends on the drill point length and substrate hardness. Consult the technical datasheet for specific thickness recommendations.

What is the black Dacromet coating and what are its benefits?

Black Dacromet is a water-based zinc flake coating with a black pigment finish that provides high corrosion resistance with extended salt spray protection. It offers a matte black aesthetic appearance suitable for visible applications while maintaining the corrosion protection properties of standard Dacromet.

Is this screw suitable for outdoor applications?

Yes. The SUS410 stainless steel material combined with black Dacromet coating provides corrosion resistance for outdoor applications. The anti-theft feature also provides security against tampering in exposed locations.

What is the recommended installation speed for this screw?

Install at controlled speeds to avoid overheating the drill point. Excessive speed may reduce drill point life and cause thread stripping. Use torque-controlled drivers to prevent over-tightening when the pan head contacts the workpiece surface. Ensure the security Torx driver is fully seated before applying torque.

Installation Considerations

Select the correct security Torx driver that matches the anti-theft drive profile. Standard Torx drivers will not engage due to the security pin or post.

Ensure the security Torx driver is fully seated and aligned with the drive before applying torque to prevent driver or drive damage.

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

Apply appropriate spindle speed based on material hardness; excessive speed may reduce drill point life and cause thermal damage to the black Dacromet coating.

Ensure perpendicular alignment between screw axis and workpiece surface to prevent drill point deflection and ensure clean hole formation.

The black Dacromet coating provides corrosion resistance and aesthetic finish. Handle screws with clean gloves to maintain coating integrity and prevent contamination.