Grip-Rite Flat Washer Head Structural Screws are engineered to replace lag screws in load-bearing exterior construction. The Type 17 point and aggressive coarse thread drive without pre-drilling, and the low-profile flat washer head seats cleanly on the surface without sacrificing strength.

• Size: 5/16" x 5"
• Pack: 500 screws per bulk box
• Drive: T-30 star drive (bit included)
• Type 17 point and coarse thread install without pre-drilling
• Flat washer head has a low profile for a smoother finish
• PrimeGuard Plus coating protects against corrosion and rust, backed by a lifetime guarantee
• Approved for use in treated lumber
• For wood, composite, and light gauge metal structural connections
• Color: Black
• Manufacturer part: GRSSFW5165500

Tip: Grip-Rite publishes load values for deck-to-ledger, multi-ply beam, and truss/rafter/joist-to-top-plate connections under ICC-ES report ESR-3933. Each box carries a QR code linking to the report, and every screw is stamped in the head with a three-digit ICC-recognized code for quick spec reference during inspection.