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ASSY® 4 WH II Washer Head Screw | Zinc Plated | Partial Thread | 8mm Diameter | @Pack of 50 | by Wurth
The ASSY® 4 WH II washer head screw is designed for structural wood fastening, featuring a zinc-plated finish and a partial thread for optimal grip. Ideal for timber construction and rafter insulation, this screw ensures high power transmission and reduced splitting during installation, making it perfect for professional tradespeople seeking reliable performance.
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Product Name/Title: ASSY® 4 WH II Washer Head Screw | Zinc Plated | Partial Thread | 8mm Diameter | @Pack of 50 | by Wurth
Brand: Wurth
SKU: 177580100
Alternatively Known As: Wood screw with washer head, Partial thread wood screw, Structural wood screw, Zinc plated wood screw, ASSY washer head screw
Technical Specifications
- Nominal diameter: 8 mm
- Length: 100 mm
- Thread length: 60 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): 2.5mm x 100mm 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 and perfect bit fit for precise positioning and one-handed working.
- Compatibility with previous AW drive.
- Visually appealing screw connection with option of countersinking like a countersunk head.
- High head penetration values and strong combination of two wooden components due to large head diameter.
- Reduced force required when fastening due to screw design.
- Less splitting when immersing the shank due to displacement milling effect.
- Minimized risk of screw breakage due to high breaking torque.
- Reduced risk of injury from protruding metal chips due to milling shank integration.
- High protection of application tools with no over-tightening or stripping.
- Higher power transmission in hardwoods due to reinforced, asymmetrical thread flank geometry.
- Better anchoring thanks to higher thread flanks.
- Smooth thread start ensures optimized recessing.
Professional Installation Requirements
- Professional installation by a qualified tradesperson is recommended to ensure correct fastening and structural integrity.
Applications
- Structural woodwork
- On rafter insulation
- Element construction
- Timber construction
- Timber panel construction
- Roof
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
Wurth offers standard manufacturer warranty covering defects in materials and workmanship.
Available Now
The Wurth ASSY® 4 WH II washer head partial thread wood screws are available for immediate purchase, ideal for structural wood construction and timber applications.
