"IMSCREWS 3/8 x 4-1/2 Heavy-Duty Lag Screws - 304 Stainless Steel (5 pcs)

Industrial-Grade Structural Penetration
When projects demand the highest level of structural integrity, these 4.5-inch bolts deliver. The thick 3/8 diameter provides massive shear resistance, making these the professional choice for securing extra-thick timber beams, heavy-duty landscaping ties, or large structural brackets to 6x6 posts where deep anchoring is non-negotiable.

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 structure. This creates a gap-free, rock-solid joint, eliminating the bridging effect common in extra-long full-thread screws for a high-tension, professional-grade finish.

304 Stainless Weather 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 and maintains structural safety on high-value cedar, redwood, or premium structural framing.

FAQ
¡ñ Tools: Fits a standard 9/16 hex socket or wrench.
¡ñ Pre-drilling: Mandatory for this extreme length and diameter. Use a 1/4 bit for softwoods or 5/16 bit for hardwoods to prevent timber splitting.
¡ñ Why 4-1/2 length? Optimized for passing through 2.5 or 3 timber while maintaining a massive 1.5 + thread anchor in the base post.

Specs:
- Size: 3/8 x 4-1/2
- Thread: Partially Threaded (Max Clamping)
- Material: 304 Stainless Steel
- Drive: 9/16 Hex Head
- Qty: 5 pcs"

Key Features

• ELITE CLAMPING POWER The engineered partial thread allows the shank to bypass the outer board, pulling thick timber together for a gap-free, rock-solid structural joint.
• DEEP-CORE ANCHORING Optimized for penetrating multi-layer beams (up to 3 thick) and anchoring deeply into structural posts with oversized 3/8 diameter.
• 304 EXTERIOR SHIELD Forged from premium 304 (18-8) stainless steel to endure humid timber cores and prevent rust staining in cedar, redwood, or ACQ lumber.
• MAX-TORQUE INTERFACE Robust hex head fits standard 9/16 socket drives, delivering maximum torque transfer for controlled installation in dense timber.
• TECHNICAL SPECIFICATION To ensure safety and prevent splitting, pre-drilling a deep pilot hole (1/4 for softwoods, 9/32 for hardwoods) is required.

Specifications

• ASIN: B0F219TK1Y
• Internal SKU: IMS0682
• Size: 3/8" x 4-1/2"
• Material: Stainless Steel
• Finish: Stainless Steel
• Head Style: Hex
• Package Quantity: 5