IMSCREWS 3/8 x 5 Extreme-Duty Lag Bolts - 304 Stainless Steel (10 pcs)
Maximum Reach for Massive Timber Structures
When projects demand industrial-grade penetration and unyielding shear resistance, these 3/8 x 5 bolts deliver. Engineered for extra-deep anchoring in heavy timber framing, securing 6x6 gate posts, or joining massive landscape beams. The 5-inch length provides elite stability for the thickest load-bearing wood members.
Vise-Like Clamping with Partial Threading
Our partially threaded shank is essential for long fasteners. It allows the bolt to spin freely in the outer board while the deep threads bite into the support beam. This draws the components together into a gap-free, rock-solid joint, eliminating the bridging effect where thick boards remain loose—a common failure in extra-long full-thread screws.
304 Stainless Exterior Defense
Forged from premium 18-8 (304) Stainless Steel for ultimate weather resistance. compatible with ACQ pressure-treated lumber. It prevents chemical corrosion and eliminates unsightly rust streaks on high-value cedar, redwood, or structural deck framing.
Technical FAQ
¡ñ Tools Required: Fits a standard 9/16 hex socket or wrench.
¡ñ Pre-drilling: Mandatory for this massive diameter and depth. Use a 1/4 bit for softwoods or 9/32 bit for hardwoods to prevent splitting.
¡ñ Why 5 length? Optimized for passing through 3 thick timber with a deep 2-inch thread anchor in the base post.
¡ñ Resilience: Rated for marine, coastal, and high-humidity outdoor use.
Specifications:
- Size: 3/8 x 5
- Thread: Partially Threaded (Max Clamping)
- Material: 304 Stainless Steel (18-8)
- Drive: 9/16 Hex Head
- Qty: 10 pcs

Key Features

• ULTIMATE CLAMPING POWER The partially threaded design ensures the smooth shank bypasses the outer timber, pulling members together for a rock-solid, gap-free joint.
• INDUSTRIAL SHEAR CAPACITY Featuring a massive 3/8-inch diameter for elite lateral load resistance, perfect for main support beams, pergolas, and deck posts.
• 304 DEEP-CORE PROTECTION Forged from 304 (18-8) stainless steel to prevent deep-seated rust in cedar and ACQ treated lumber, ensuring structural integrity for decades.
• STABLE TORQUE INTERFACE Precision hex head provides a secure 9/16 socket fit, offering stable torque transfer for controlled, slip-free seating in extra-thick timber.
• TECHNICAL SPECIFICATION To ensure joint integrity and prevent splitting, pre-drilling a pilot hole (1/4 for softwoods, 9/32 for hardwoods) is mandatory for these 3/8 bolts.

Specifications

• ASIN: B0F21F555W
• Internal SKU: IMS0686
• Size: 3/8" x 5"
• Material: Stainless Steel
• Finish: Stainless Steel
• Head Style: Hex
• Package Quantity: 10