Specification: ST4.2-18*16

Material: SUS410

Surface Treatment: Brightening

Single weight：1.07

Product Introduction

The CSK Phillips Self-Drilling Screw is designed for metal fastening applications requiring a flush surface finish with a widely compatible drive system. The countersunk (CSK) head configuration allows the screw to sit level with or below the workpiece surface when used with a corresponding countersink, providing a smooth appearance and eliminating protrusions. The Phillips drive enables positive engagement with standard cross-point drivers, offering broad tool compatibility for installation. 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 ST4.2-18 thread specification with 16mm length offers engagement for sheet metal and light structural assemblies requiring flush mounting.

Core Advantages

Countersunk Head

Flush mounting capability provides smooth surface finish and eliminates protrusions for applications requiring a level surface.

Phillips Drive

Widely compatible cross-point drive system enables easy engagement with standard Phillips drivers for convenient installation.

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.

Compact Length

16mm length provides engagement for sheet metal and light structural assemblies with flush mounting requirements.

Product Features

Countersunk head configuration Flush mounting provides smooth surface finish for applications requiring a level surface without protrusions when used with corresponding countersink.

Phillips drive Widely compatible cross-point drive system enables easy engagement with standard Phillips drivers for convenient installation and broad tool compatibility.

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.

ST4.2-18 thread specification Standardized thread configuration provides consistent performance for sheet metal and light structural assemblies.

16mm length Compact length provides engagement for sheet metal assemblies with flush mounting requirements.

Application Scenarios

Sheet metal assemblies

Equipment enclosures

Electronics chassis

Furniture construction

Architectural metalwork

Instrumentation panels

Automotive components

Industrial equipment

This CSK Phillips self-drilling screw is deployed in applications requiring a flush surface finish after fastening with a widely compatible drive system. Applications include sheet metal assemblies where smooth surfaces are essential, equipment enclosures, electronics chassis, furniture construction where protrusions would interfere with aesthetics, architectural metalwork, instrumentation panels, automotive components, and industrial equipment where the countersunk head provides flush mounting and the brightening finish offers an aesthetic appearance.

Common Questions and Solutions

What are the advantages of the countersunk head design?

The countersunk head allows the screw to sit flush with or below the workpiece surface when used with a corresponding countersunk hole, providing a smooth appearance and eliminating protrusions that could interfere with adjacent components, processes, or finishing operations.

What is the recommended countersink angle for this screw?

Countersunk screws typically use 82-degree or 90-degree angles. Select based on the mating countersink in the workpiece. Verify the head angle against the countersink tool specification to ensure proper seating and flush mounting.

What is the recommended Phillips driver size for this screw?

Select a Phillips driver that matches the head size specified for the ST4.2 thread. Using the correct driver size prevents driver slippage and damage to the drive recess. Refer to the product specification for the exact Phillips size.

What material thickness can the ST4.2-18*16 screw accommodate?

The ST4.2-18 specification with 16mm length provides engagement for sheet metal and light structural assemblies. 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.

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 countersunk head seats flush with the workpiece surface.

Installation Considerations

Select the correct Phillips driver size that matches the screw head recess to prevent driver slippage and drive damage during installation.

Ensure the countersink angle matches the screw head angle for proper seating and flush mounting without damage to surrounding material.

Use torque-controlled installation tools to prevent over-driving. The countersunk head should seat flush with the workpiece surface without sinking below or damaging 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.