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

Extreme Reach for Critical Structural Joints
Engineered for deep-core anchoring, these 3.5-inch bolts are the industrial choice for heavy-duty timber framing. The 3/8 diameter provides massive shear resistance, making them ideal for securing heavy beams, deck ledger boards, or structural brackets to 4x4 and 6x6 posts where maximum load-bearing capacity is required.

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 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 resistance. compatible with ACQ pressure-treated lumber. These screws are essential for outdoor projects, coastal environments, and preventing unsightly corrosion streaks on premium cedar or redwood structures.

FAQ
¡ñ Tools: Fits a standard 9/16 hex socket or wrench.
¡ñ Pre-drilling: Required for 3/8 bolts. Use a 1/4 bit for softwoods or 5/16 bit for hardwoods to prevent timber splitting.
¡ñ Why 3-1/2 length? Perfect for passing through 1.5 or 2 timber with a massive 1.5 + thread anchor in the base beam for maximum pull-out resistance.

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

Key Features

• MAXIMUM CLAMPING FORCE The engineered partial thread allows the smooth shank to bypass the outer beam, pulling lumber together for a gap-free, rock-solid structural joint.
• STRUCTURAL CORE ANCHORING Optimized for heavy-load framing, providing elite withdrawal and shear resistance with a massive 3-inch reach and 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 or ACQ lumber.
• STABLE TORQUE DELIVERY Precision hex head ensures a secure 9/16 socket fit, delivering maximum torque transfer for controlled installation in dense hardwoods.
• TECHNICAL SPECIFICATION To ensure structural safety and prevent splitting, pre-drilling a pilot hole (1/4 for softwoods, 9/32 for hardwoods) is mandatory.

Specifications

• ASIN: B0F21F1JC8
• Internal SKU: IMS0672
• Size: 3/8" x 3"
• Material: Stainless Steel
• Finish: Stainless Steel
• Head Style: Hex
• Package Quantity: 2