"IMSCREWS 3/8 x 3-1/2 Heavy-Duty Lag Screws - 304 Stainless Steel (10 pcs)

Extreme Strength for Major Wood Structures
Engineered for safety-critical joints where standard screws fall short. These 3/8 diameter bolts provide massive shear resistance for structural timber framing, deck ledger boards, and heavy gate posts. The 3.5-inch length is the contractor's choice for deep-core anchoring in 4x4 and 6x6 beams.

Vise-Like Clamping with Partial Threading
Our partially threaded shank allows the bolt to pull the outer board tightly against the support post. This creates a gap-free, vise-like connection, eliminating the bridging effect where boards remain loose—a common failure in long full-thread screws. Ideal for creating rigid, professional joints in heavy structural nodes.

304 Stainless Exterior Defense
Forged from premium 18-8 (304) Stainless Steel for ultimate weather protection. compatible with ACQ pressure-treated lumber, preventing structural decay and unsightly rust streaks on high-value cedar, redwood, or deck framing.

Technical FAQ
¡ñ Tools: Fits a standard 9/16 hex socket or wrench.
¡ñ Pre-drilling: Mandatory for this diameter. Use a 1/4 bit for softwoods or 9/32 bit for hardwoods to prevent splitting.
¡ñ Why 3-1/2 length? Optimized for passing through 1.5 timber (like a 2x4) with a strong 2-inch thread anchor in the base post.
¡ñ Resilience: Rated for marine, coastal, and high-humidity environments.

Specifications:
- Size: 3/8 x 3-1/2
- Thread: Partially Threaded (Max Clamping)
- Material: 304 Stainless Steel (18-8)
- Drive: 9/16 Hex Head
- Qty: 10 pcs"

Key Features

• ELITE CLAMPING POWER The partially threaded design ensures the smooth shank stays in the outer board, allowing threads to pull timber members together with immense force for a gap-free joint.
• HEAVY-DUTY SHEAR STRENGTH The robust 3/8-inch diameter provides industrial-grade lateral load resistance, outperforming thinner fasteners for deck beams, pergolas, and framing.
• 304 EXTERIOR DEFENSE Forged from premium 304 (18-8) stainless steel to prevent rust and staining in cedar, redwood, or ACQ pressure-treated lumber projects.
• STABLE TORQUE DRIVE Features a precision hex head for 9/16 power sockets, providing stable torque transfer for controlled, slip-free seating in dense timber cores.
• TECHNICAL SPECIFICATION To prevent splitting from this robust 3/8 bolt, pre-drilling a pilot hole (1/4 for softwoods, 9/32 for hardwoods) is mandatory for structural safety.

Specifications

• ASIN: B0F21BVVVH
• Internal SKU: IMS0677
• Size: 3/8" x 3-1/2"
• Material: Stainless Steel
• Finish: Stainless Steel
• Head Style: Hex
• Package Quantity: 10