GRK 10231 RSS Timber Screws, 5/16"X5-1/8" 300Pk

GRK 10231 RSS Timber Screws, 5/16"X5-1/8" 300Pk

The GRK 10231 RSS Timber Screws are a high-strength structural fastening solution designed to replace traditional lag screws with less effort and better performance. Built from specially hardened steel, these screws deliver exceptional tensile and shear strength while driving faster with less torque. Featuring CEE Thread™ technology, they reduce splitting and improve drawing power, while the washer head design provides superior holding strength and clean seating. In short, they do the heavy lifting—without making your drill work overtime.

Country of Origin
Varies by production batch

Key Features / Specifications

• Model / Part Number: 10231
• Product Type: Structural timber screws (RSS – Rugged Structural Screw)
• Size: 5/16" x 5-1/8"
• Thread Length: 3-1/2"
• Drive Type: T-30 star drive
• Head Type: Washer head for increased holding power
• Material: Case-hardened steel
• Finish/Coating: Climatek™ coating (AC257 approved for treated lumber)
• Package Quantity: 300 screws (box)
• Shear Strength: 2,948 lbs
• Tensile Strength: 4,247 lbs
• Applicable Materials: Wood (including hardwood)

Performance Features:

• CEE Thread™ enlarges hole to reduce splitting and improve draw strength
• W-Cut™ thread design lowers torque and speeds installation
• Zip-Tip™ eliminates pre-drilling with fast, clean penetration
• Recessed star drive with six points of contact reduces stripping
• Cutting pockets create clean holes and minimize splitting
• Washer head with built-in shoulder centers fastener in hardware like hinges and plates
• Reduced friction shank design improves driving efficiency

Ideal For

• Structural wood connections where high strength and reliability are required
• Replacing traditional lag screws with a faster, easier installation option
• Deck building, framing, timber construction, and heavy-duty fastening
• Applications involving treated lumber or hardwoods
• Anyone who wants serious holding power without pre-drilling every hole