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ASSY® 4 WH II Washer Head Screw Zinc Plated Partial Thread Variant-1 Wurth

BRAND: Wurth
SKU: 177580100
$108.90 List price: $136.90
50 PCS ($2.18 per PCS)
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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.
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.

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