PowerLags 5/16 In. In. X 3 In. L T-40 Washer Head Serrated Structural Screws

Spax PowerLags are washer head structural screws engineered for demanding wood-to-wood construction applications. The 5/16 In. x 3 In. size with T-40 Star Drive delivers superior fastening performance for framing, decking, and structural assembly projects where reliability and speed matter. These screws eliminate the need for pre-drilling, reduce driving torque by up to 40%, and install faster than conventional lag screws, making them ideal for both professional contractors and serious DIY builders.

Heat-treated construction enhances toughness for interior and exterior applications, and the high corrosion resistance (HCR) coating protects against rust and corrosion, making these screws suitable for treated lumber and outdoor use. A fastener length stamp on the head aids in identification and on-site inspection without measuring.

Features and Benefits

• T-40 Star Drive: Deep T-Star drive ensures superior bit engagement and comes with an included driver bit for proper engagement without requiring a special bit.
• Washer Head Design: Round washer head for structural stability and load distribution.
• Self-Tapping Action: Patented thread serrations eliminate pre-drilling requirements and significantly increase installation speed.
• High Corrosion Resistance: HCR coating provides exceptional protection against rust and corrosion for both indoor and outdoor applications.
• Heat Treated: Advanced heat treatment improves toughness and durability for demanding structural fastening.
• Length Identification Stamp: Fastener length marked on head for quick on-site identification and inspection.

Specifications

• Brand: Spax
• Model: 4581820800765
• Size: 5/16 In. x 3 In.
• Drive Type: T-40 Star Drive
• Head Style: Washer Head
• Pack Count: 50 pieces
• Application: Wood-to-wood structural fastening
• Coating: High Corrosion Resistance (HCR)