Standard: DIN965, ISO 7046, ANSI/ASMEB 18.6.3
Material: SUS410, SUS304, SUS316 stainless steel
Specification: M3, M4, M5, M6, M8, 6#, 7#, 8#, 10#, 12#,14#, 1/4”
Surface Treatment: Passivation, Galvanizing, Nickel Plating, Blackening, Head Spraying, Dacromet, Hot Rustoleum, Laspex, Drop Resistant
Product Introduction
Countersunk Head Machine Screws are precision fasteners designed for applications requiring flush surface finish with reliable thread engagement. The countersunk 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 that could interfere with adjacent components, processes, or finishing operations. These screws feature machine threads that mate with pre-tapped holes or nuts, providing consistent and reliable engagement. Available in stainless steel (SUS410, SUS304, SUS316) material options, the screws comply with DIN965, ISO7046, and ANSI/ASME B18.6.3 standards. Multiple surface treatments provide corrosion resistance options for various environmental conditions, including passivation, galvanizing, nickel plating, blackening, and Dacromet finishes. Metric sizes from M3 to M8 and imperial sizes from 6# to 1/4" accommodate diverse application requirements.
Core Advantages
01
Countersunk Head Design
Flush mounting capability provides smooth surface finish and eliminates protrusions for applications requiring a level surface.
02
Machine Thread Design
Precision threads mate with pre-tapped holes or nuts for consistent and reliable engagement in machinery assemblies.
03
Multiple Material Options
Available in SUS410, SUS304, and SUS316 stainless steel to meet diverse application requirements.
04
Wide Specification Range
Metric sizes from M3 to M8 and imperial sizes from 6# to 1/4" for comprehensive application coverage.
05
Extensive Surface Treatments
Passivation, galvanizing, nickel plating, blackening, Dacromet, and hot rustoleum finishes for environmental adaptability.
06
Standard Compliance
Manufactured to DIN965, ISO7046, and ANSI/ASME B18.6.3 specifications for quality assurance.
Product Features
Countersunk head configuration Flush mounting provides smooth surface finish for applications requiring a level surface without protrusions when used with corresponding countersink.
Machine thread design Precision threads mate with pre-tapped holes or nuts, providing consistent and reliable engagement for general-purpose fastening.
SUS410 stainless steel Provides hardness for applications requiring strength with moderate corrosion resistance.
SUS304 stainless steel Provides general corrosion resistance suitable for indoor and mild outdoor applications with a bright finish.
SUS316 stainless steel Provides marine-grade corrosion protection for harsh environments and chemical exposure applications.
Metric specification range Available in M3, M4, M5, M6, and M8 diameters for diverse machine fastening requirements.
Imperial specification range Available in 6#, 7#, 8#, 10#, 12#, 14#, and 1/4" sizes for North American standard applications.
Surface treatment options Passivation and galvanizing provide corrosion protection; nickel plating offers enhanced appearance; blackening delivers aesthetic matte finish; Dacromet provides high salt spray resistance.
Application Scenarios
General machinery assembly
Equipment enclosures
Electronics chassis
Furniture construction
Automotive components
Architectural metalwork
Instrumentation panels
Industrial equipment
These countersunk head machine screws are deployed in general-purpose metal fastening applications requiring flush surface finish with reliable thread engagement. Applications include general machinery assembly where smooth surfaces are essential, equipment enclosures, electronics chassis, furniture construction, automotive components, architectural metalwork, instrumentation panels, and industrial equipment where the countersunk head provides flush mounting and the machine thread offers consistent engagement in pre-tapped holes or with nuts.
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 these screws?
Countersunk machine 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 difference between machine screws and self-tapping screws?
Machine screws feature standard machine threads that require pre-tapped holes or nuts for engagement. Self-tapping screws cut their own mating threads in pre-drilled holes. Machine screws provide consistent thread engagement in precision applications where tapping is already performed.
What is the recommended driver type for these screws?
Countersunk machine screws are available with various drive types including Phillips, slotted, hex, and six-lobe. Select the appropriate driver based on the drive configuration specified for your application.
What surface treatment provides the best corrosion protection?
Dacromet coating provides the highest salt spray resistance. For stainless steel fasteners, passivation enhances the natural oxide layer for improved corrosion resistance. Hot rustoleum offers protection for outdoor applications.
What is the recommended installation torque for these screws?
Installation torque varies by thread size, material, and application. Use torque-controlled drivers to prevent over-tightening. Consult the technical datasheet for recommended torque values based on screw specification and substrate material.
Installation Considerations
1
Ensure pre-tapped holes are within specified thread tolerance to prevent thread damage and ensure proper engagement.
2
Ensure the countersink angle matches the screw head angle for proper seating and flush mounting without damage to surrounding material.
3
Select the correct driver type and size that matches the screw head drive configuration to prevent driver slippage and damage.
4
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.
5
When using nuts, apply appropriate torque values and consider using lock washers or thread-locking compounds for vibration resistance.
6
Select the appropriate thread size and length based on the thickness of materials being fastened and thread engagement requirements.
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