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Washer Head Screw | 8mm Diameter | Zinc Plated | Partial Thread | @Pack of 50 | by Wurth
The ASSY® 4 WH II washer head screw is designed for structural wood fastening, featuring an 8mm nominal diameter and a durable zinc plating. Ideal for timber construction and roof fastening, this screw ensures optimal power transmission with its RW drive and larger contact area, making it perfect for professional applications.
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Product Name/Title: Washer Head Screw | 8mm Diameter | Zinc Plated | Partial Thread | @Pack of 50 | by Wurth
Brand: Wurth
SKU: 177580140
Alternatively Known As: Washer head wood screw, Partial thread wood screw, Structural wood screw, Zinc plated wood screw
Technical Specifications
- Nominal diameter: 8 mm
- Length: 140 mm
- Thread length: 80 mm
- Head type: Washer head II
- Head diameter: 18.4 mm
- Head height: 2.5 mm
- Internal drive: RW40
- Thread type: Wood screw thread
- Thread design: Partial thread
- End milling cutter: Yes
- Thread form: Coarse thread
- Core diameter: 5.3 mm
- Shape of tip: Tip with hilltop milling cutter
- Angle of the tip: 34 degrees
- Material: Hardened steel
- Surface: Zinc plated
- Colour: Silver
- Max screw-in angle: 90 degrees
- Min screw-in angle: 0 degrees
- Suitable materials: Wood, Derived timber product, Softwood, Board plywood (BSP), Hardwood, LVL
- Additional accessory: Bit lock
- Approval: ETA-11/0190
- RoHS-compliant: Yes
- Dimensions (H x L x W): 140mm x 140mm x 18mm
- Weight: 0.15 kg
Key Features
- Universal partial-thread screw with washer head for wood-wood fastening
- Suitable for 90° or inclined screw connections in structural wood construction
- Ideal power transmission thanks to RW drive
- Larger contact area at the bit for more power
- Tight-fit recess for precise positioning and one-handed working
- Compatibility with previous AW drive
- Visually appealing screw connection with option of countersinking
- High head penetration values and strong combination of wooden components
- Reduced force required when fastening due to milling shank displacement effect
- Minimized risk of screw breakage due to high breaking torque
- Reduced risk of injury from protruding metal chips
- High protection of application tools
- Reinforced asymmetrical thread flank geometry for higher power transmission in hardwoods
- Smooth thread start ensures optimized recessing
Professional Installation Requirements
- Professional installation recommended for structural applications to ensure compliance with building codes and safety standards.
Applications
- Structural woodwork
- On rafter insulation
- Element construction
- Timber construction
- Timber panel construction
- Roof fastening
Standards & Compliance
- Complies with AS/NZS 1170 – Structural Design Actions (Wind, Earthquake, Snow Loads)
Environmental Benefits
- RoHS-compliant ensuring reduced hazardous substances
- Durable zinc plating extends product life reducing waste
Warranty Information
Warranty as per Wurth standard terms and conditions.
Available Now
Available for immediate purchase, ideal for structural wood construction and timber fastening applications.
