Hex Washer Head Self Drilling Screw for Steel to Steel Applications
ASME IFI and Metric standard Size
|
Diameter |
Length |
|
#10-16(ST4.8) |
1/2''-4''inch(13-1150mm) |
|
#12-14(ST5.5) |
1/2''-6''inch(13-200mm) |
|
#14-14(ST6.3) |
1/2''-6''inch(13-300mm) |
Hex washer head self drilling screws are designed for fastening steel to steel without pre-drilling. With a built-in drill point and hex washer head, these screws provide high torque transmission and secure installation in metal structures.
Typical Steel Thickness & Drill Capacity
Different drill points are suitable for different steel thickness:
#2 drill point → up to 3mm steel
#3 drill point → 3mm – 6mm steel
#5 drill point → up to 12mm steel
👉 Choosing the correct drill point ensures efficient drilling and prevents screw damage.
Product Specifications
Head Type: Hex washer head
Drive: Hex
Thread: Self drilling
Material: Carbon steel / Stainless steel
Surface: Zinc plated, Ruspert, HDG
Diameter: #8 – #14
Length: 13mm – 150mm
Application Scenarios
These screws are commonly used in:
Steel structure construction
Metal roofing framework
Purlin to purlin fastening
Industrial equipment assembly
HVAC duct installation
Installation Guidelines
To achieve best performance:
Use correct drill point for steel thickness
Apply consistent pressure during drilling
Use magnetic hex socket for better grip
Avoid over-tightening
Why Hex Washer Head Screws Are Preferred
Strong Torque Transmission
Hex head design allows use of power tools, improving installation efficiency.
Integrated Washer Design
Provides better load distribution and prevents surface damage.
No Pre-Drilling Required
Reduces labor time and improves installation speed.
Surface Coating Selection Guide
Zinc plated → indoor use
Ruspert coating → high corrosion resistance
HDG → outdoor heavy-duty use
Why Choose Our Factory
100+ cold heading machines
Monthly capacity 600 tons
Strict thread and hardness control
OEM packaging and branding
FAQ
What is a hex washer head self drilling screw used for?
Used for fastening metal to metal without pre-drilling.
Which drill point should I choose?
Depends on steel thickness (#2, #3, #5).
Are these screws suitable for outdoor use?
Yes, with Ruspert or HDG coating.
Request Quote & Samples
Looking for reliable hex head drilling screw supplier?
Send your inquiry with:
Size
Drill point
Quantity
👉 Free samples available
👉 Fast quotation within 12 hours
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