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Big Dog Wood Screw Acid-Resistant Stainless Steel A4 8x60mm T40 25pcs Fast 281615

Acid-proof wood screw sized 8x60 mm with washer head, partial thread and cutter tip for strong outdoor timber joints in A4 stainless steel.

Big Dog Wood Screw Acid-Resistant Stainless Steel A4 8x60mm T40 25pcs Fast 281615

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Big Dog Wood Screw Acid-Resistant Stainless Steel A4 8x60mm T40 25pcs Fast 281615

Acid-proof wood screw sized 8x60 mm with washer head, partial thread and cutter tip for strong outdoor timber joints in A4 stainless steel.

Description

The Fast Big Dog Wood Screw (A4, 8x60 mm) represents a new generation of fasteners designed for heavy-duty, high-stress outdoor timber construction. Developed to fully replace traditional lag screws (coach screws), this product combines significantly faster installation speeds with superior precision and clamping force. Its carefully engineered geometry allows for the secure joining of heavy timber sections, while the acid-resistant material ensures maximum service life, even under extreme conditions. CE-marked in accordance with the harmonized standard EN 14592, the screw meets all European requirements for load-bearing structures, providing peace of mind when designing demanding projects.

Integrated washer head for maximum contact area and load-bearing capacity

A key feature of the Big Dog is its generously sized, integrated washer head. Unlike traditional countersunk screws, the washer head distributes pressure over a significantly larger surface area against the wood. This design eliminates the risk of the head sinking too deep and crushing the outer wood fibers when tightened firmly. The broad contact area provides substantially improved pull-through resistance—a critical advantage for load-bearing timber-to-timber connections. Consequently, the structure achieves a highly stable and durable anchorage capable of withstanding significant external stress and movement over time.

Powerful clamping action through a partially threaded design

The screw has a total length of 60 mm, with a 36 mm threaded section, meaning it is partially threaded. As the screw is driven in, the smooth portion of the shank slides freely through the outer piece of timber, while the threads grip the underlying material. This mechanical action creates a powerful clamping force that effectively pulls the timber components together, eliminating unwanted gaps or spaces. Compared to fully threaded screws, this principle results in a tighter, stronger, and more dimensionally stable connection between the structural members.

Optimized driving torque with a cutting tip and TX drive

Installation into dense timber is facilitated by the screw’s specially designed cutting tip. As it rotates, this tip cuts through the wood fibers rather than forcing them apart; this reduces resistance during insertion and minimizes the risk of splitting—even when working near edges or end grain. To handle high torque, the head features a precision-milled TX recess designed for a T40-size bit. This interface ensures optimal contact between the bit and the screw, preventing the tool from slipping (camming out) and reducing wear on both the tool and the screw head.

Acid-resistant A4 steel for demanding environments (corrosivity class C5)

Manufactured from acid-resistant A4-grade stainless steel, this screw is approved for corrosivity class C5—the highest level of corrosion protection. It withstands aggressive salts, moisture, industrial pollutants, and chemical exposure—conditions that would cause galvanized or standard stainless steel to degrade. This makes the product a reliable choice for jetties, boathouses, coastal decking, and other exposed outdoor environments.

Practical applications

  • Load-bearing frameworks for patios, timber decks, and pergolas
  • Installation of support beams, joists, and heavy structural timber
  • Facade installation and exterior timber cladding
  • Structures in coastal areas, such as piers and boathouses
  • Installations requiring maximum service life and high clamping force

Technical specifications

  • Model series: Big Dog A4
  • Type: Partially threaded wood screw with a washer head
  • Shank diameter and length: 8x60 mm
  • Thread length: 36 mm
  • Material: Acid-proof stainless steel (A4)
  • Corrosivity class: C5
  • Point type: Cutter point
  • Drive type: TX
  • Bit size: T40
  • Standard and certification: CE-marked according to EN 14592
  • Quantity per package: 25 pcs

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