IMSCREWS 5/16 x 4 Hex Head Lag Screws, 304 Stainless Steel, Partially Threaded Extra-Long Wood Bolts for Framing & Decks, 5 pcs

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

Extreme Penetration for Structural Timber
Our 4-inch lag bolts are engineered for projects requiring maximum reach and anchoring depth. The robust 5/16 diameter provides professional-grade shear resistance, making these ideal for securing thick timber beams, landscape timbers, or structural components to 4x4 and 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 beam. 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: 5 pcs"

Key Features

• DEEP-ANCHOR CLAMPING The 4 length with a partial thread allows the shank to bypass the outer board, pulling timbers together for a gap-free, rock-solid joint.
• STRUCTURAL SHEAR STRENGTH At 5/16 diameter, these bolts provide professional-grade lateral resistance for high-load beam and post connections.
• 304 EXTERIOR DEFENSE Forged from 304 (18-8) stainless steel to prevent rust and corrosive staining in cedar, redwood, or ACQ pressure-treated lumber.
• HIGH-TORQUE PERFORMANCE Robust hex head ensures a secure 1/2 socket fit, providing maximum torque transfer for controlled installation in dense hardwoods.
• TECHNICAL SPECIFICATION To ensure structural safety and prevent splitting, pre-drilling a pilot hole (7/32 for softwoods, 1/4 for hardwoods) is mandatory.

Specifications

• ASIN: B0F21CH75R
• Internal SKU: IMS0649
• Size: 5/16" x 4"
• Material: Stainless Steel
• Finish: Stainless Steel
• Head Style: Hex
• Package Quantity: 5