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

Extreme Reach for Deep Timber Joints
When your project demands deep penetration, these 4-inch lag bolts provide the necessary reach for structural framing. Perfect for securing landscape timbers, heavy fence rails, or attaching components to 4x4 posts. The 1/4 diameter offers high shear resistance for critical outdoor structural nodes.

Vise-Like Clamping Power
Our partially threaded shank features a smooth upper section that allows the bolt to spin freely in the outer board. This draws the timber members together into a gap-free, rock-solid joint, eliminating the bridging effect where 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 deck framing.

Technical FAQ
¡ñ Tools Required: Fits a standard 7/16 hex socket or wrench.
¡ñ Pre-drilling: Mandatory for this length. Use a 1/8 bit for softwoods or 3/16 bit for hardwoods to prevent splitting.
¡ñ Why 4 length? Optimized for passing through 2 or 2.5 thick timber with a deep 1.5 + thread anchor in the base post.
¡ñ Resilience: Rated for marine, coastal, and high-humidity outdoor use.

Specifications:
- Size: 1/4 x 4
- Thread: Partially Threaded (Max Clamping)
- Material: 304 Stainless Steel (18-8)
- Drive: 7/16 Hex Head
- Qty: 5 pcs"

Key Features

• MAXIMIZED CLAMPING FORCE The engineered partial thread allows the smooth shank to bypass the primary timber, focusing the entire thread engagement on the support member to draw the joint together with massive force.
• THERMAL FRICTION CONTROL By reducing thread contact in the upper shaft, this design lowers driving resistance and heat accumulation, protecting the stainless steel from snapping during deep 4-inch penetrations.
• CORE-LEVEL 304 PROTECTION Forged from premium 304 (18-8) stainless steel to prevent rust in the moisture-prone core of oversized timber. Fully compatible with ACQ pressure-treated lumber.
• STRUCTURAL CORE STRENGTH The robust 1/4-inch diameter offers heavy-duty shear resistance, providing a secure, bolt-level hold for deck posts, pergolas, and framing projects.
• MANDATORY PRE-DRILLING To ensure joint integrity and prevent splitting in deep 4-inch drives, pre-drilling a pilot hole (3/16 for softwoods, 7/32 for hardwoods) is mandatory.

Specifications

• ASIN: B0F21C6X3Z
• Internal SKU: IMS0624
• Size: 1/4" x 4"
• Material: Stainless Steel
• Finish: Stainless Steel
• Head Style: Hex
• Package Quantity: 5