"IMSCREWS 5/16 x 4 Heavy-Duty Lag Screws - 304 Stainless Steel (2 pcs)

Extreme Penetration for Structural Timber
Our 4-inch lag bolts are engineered for maximum reach in heavy-duty framing. The robust 5/16 diameter provides superior shear resistance, making these the professional choice for securing thick timber beams, landscape timbers, or structural components to 6x6 posts.

Vise-Like Clamping Power
Our partially threaded shank features a smooth upper section that allows the bolt to pull the outer timber tightly against the support post. This creates a gap-free, rock-solid joint, eliminating the bridging effect common in extra-long full-thread screws for a professional-grade finish.

304 Stainless Protection
Forged from premium 18-8 (304) stainless steel for elite rust protection in outdoor and humid environments. compatible with ACQ pressure-treated lumber. Prevents unsightly rust streaks on high-value cedar, redwood, or premium deck framing.

FAQ
¡ñ Tools: Fits a standard 1/2 hex socket or wrench.
¡ñ Pre-drilling: Mandatory for this length. Use a 3/16 bit for softwoods or 7/32 for hardwoods to prevent timber splitting.
¡ñ Why 4 length? Perfect for passing through 2 or 2.5 thick timber with a deep 1.5 + thread anchor in the base beam.

Specs:
- Size: 5/16 x 4
- Thread: Partially Threaded (Max Clamping)
- Material: 304 Stainless Steel
- Drive: 1/2 Hex Head
- Qty: 2 pcs"

Key Features

• DEEP-ANCHOR PRECISION The 4-inch reach is engineered for thick timber assemblies, penetrating multi-layer beams to provide industrial-grade holding power.
• VISE-LIKE CLAMPING Featuring a partial thread design, the smooth shank bypasses outer lumber to pull pieces together for a professional, gap-free joint.
• 304 WEATHER SHIELD Forged from 304 (18-8) stainless steel to endure extreme humidity and prevent rust streaks on redwood, cedar, or ACQ lumber.
• HIGH-TORQUE DRIVE Robust hex head fits 1/2 socket drives perfectly, ensuring controlled, high-torque installation in dense hardwoods without head-snapping.
• PRECISION 2-PACKPerfect for specialized repairs or single-point heavy mounting, providing exactly what you need for critical structural tasks.

Specifications

• ASIN: B0F21BYLCC
• Internal SKU: IMS0648
• Size: 5/16" x 4"
• Material: Stainless Steel
• Finish: Stainless Steel
• Head Style: Hex
• Package Quantity: 2