Specification: ST4.8-16*50

Material: SUS410

Surface Treatment: Brightening

Single weight：4.89

Product Introduction

The Pan Head Torx Anti-Theft Self-Drilling Screw is designed for security-sensitive metal fastening applications requiring enhanced protection against unauthorized tampering with an aesthetic finish. The pan head configuration provides a flat underside for accurate clamping force distribution, while the Torx anti-theft drive enables positive torque transmission with reduced cam-out risk and a specialized profile requiring dedicated tools for engagement. The self-drilling point drills and taps threads simultaneously, eliminating pilot hole requirements and reducing assembly time. Manufactured from SUS410 stainless steel with brightening surface treatment, this screw provides hardness for metal fastening with an aesthetic bright finish. The ST4.8-16 thread specification with 50mm length offers extended engagement for structural connections and heavy-duty metal assemblies requiring security features.

Core Advantages

Torx Anti-Theft Drive

Specialized drive profile with security feature requires dedicated tools for installation and removal, preventing unauthorized tampering.

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.

Brightening Treatment

Aesthetic bright finish with enhanced surface smoothness and improved corrosion resistance.

Extended Length

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

Product Features

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

Brightening surface treatment Aesthetic bright finish with enhanced surface smoothness and improved corrosion resistance.

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 with brightening finish is deployed in security-sensitive metal fastening applications requiring aesthetic appearance and protection against unauthorized removal. Applications include security-sensitive structures, public infrastructure, 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 brightening finish offers an attractive appearance.

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 brightening surface treatment?

Brightening is a surface treatment process that enhances the natural finish of the stainless steel material. It provides a bright, aesthetic appearance while improving surface smoothness and corrosion resistance through removal of surface contaminants and oxidation.

Is this screw suitable for outdoor applications?

The SUS410 stainless steel material with brightening treatment provides corrosion resistance suitable for indoor and mild outdoor applications. The anti-theft feature also provides security against tampering in exposed locations. For harsh outdoor environments with extended salt spray exposure, Dacromet coating may be recommended.

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 brightening finish.

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

The brightening treatment provides aesthetic and corrosion protection. Handle screws with clean gloves to maintain surface appearance and prevent contamination.