All-in-One Function: Self-drilling tip easily penetrates metal sheets and structural steel without pre-drilling.
BAZ Washer (EPDM Bonded Washer): Provides a watertight and weatherproof seal, protecting against leaks, corrosion, and vibration - ideal for outdoor use.
| Inch Size | Metric Equivalent | Common Industry Reference |
|---|---|---|
| #10 | M4.8 | Light steel & sheet metal |
| #12 | M5.5 | Roofing & cladding |
| #14 | M6.3 | Structural / heavy duty |
Standard Length Chart (Inch & Metric)
| Inch Length | Metric Length (mm) | Typical Applications |
|---|---|---|
| 1/2" | 13 mm | Thin sheet metal |
| 5/8" | 16 mm | Sheet to sheet fixing |
| 3/4" | 19 mm | Light steel framing |
| 1" | 25 mm | Roofing & panels |
| 1-1/4" | 32 mm | Steel to steel |
| 1-1/2" | 38 mm | Multi-layer fixing |
| 2" | 50 mm | Structural fastening |
| 2-1/2" | 63 mm | Thick steel sections |
| 3" | 75 mm | Heavy-duty use |
| 4" | 100 mm | Special applications |
With Around 20 years of manufacturing experience, Handan Dongchao Hardware Products Co., Ltd is a trusted producer of self-drilling screws, self-tapping screws, bolts, nuts, anchors, and fasteners.
We focus on strict quality control, customized service, and reliable export support for roofing contractors, distributors, and hardware importers worldwide
Integrated Drilling Point
Sharp, precise tip enables easy penetration through steel and metal sheets without pre-drilling.
Hex Washer Head Design
Provides higher torque transmission and ensures a secure, flush finish.
EPDM Washer
Creates a weatherproof and watertight seal - ideal for outdoor roofing applications.
High Strength & Durability
Made from premium carbon steel or stainless steel with zinc, Ruspert, or Dacromet coating.
Standards & Customization
Available in DIN, ASME, BSW, and fully customized specifications upon request.
Free Samples And Customized Service
Free sample can be arrange based on drawings and customized service supported
What Makes BAZ Washers Different
BAZ washers are engineered to provide:
Higher compression resistance
Improved sealing under load
Stable performance during long-term service
Compared with standard washers, BAZ washers maintain consistent contact pressure even under vibration and temperature changes.
Advantages in Construction Applications
Key benefits include:
Enhanced sealing performance
Reduced risk of loosening
Improved load distribution
Suitable for demanding installation conditions
These features make BAZ washer screws suitable for engineering-level construction projects.
Typical Applications
Steel structure connections
Industrial roofing systems
Heavy-duty wall cladding
Commercial building envelopes
They are commonly used in projects with higher structural and environmental requirements.
Screw Design & Compatibility
BAZ washers are typically assembled with:
Hex washer head self drilling screws
Structural self drilling screws
The hex drive ensures reliable torque transmission during installation.
Material & Coating Options
Screw materials
Carbon steel
Stainless steel (410 / 304 / 316)
Surface coatings
Zinc plated
Ruspert coated
Mechanical galvanized
Options are selected according to project environment and service life expectations.
Size Range & Installation Guidance
Diameter: 4.8 mm – 6.3 mm
Length: 25 mm – 150 mm
Installation tips:
Use controlled torque
Ensure even washer seating
Avoid re-driving at the same position
Packaging & Project Supply
Bulk cartons for project supply
OEM-labeled packaging
Palletized shipment options
Suitable for contractors and project-based orders.
Why Choose Our BAZ Washer Screws
Reliable sealing under load
Consistent washer structure
Stable production capacity
Experience in construction export projects
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