"IMSCREWS 1/4 x 3 Heavy-Duty Lag Screws - 304 Stainless Steel (20 pcs)

Extended Reach for Deep Timber Joints
When standard screws are too short, these 3-inch lag bolts provide the necessary depth for structural framing. Ideal for securing double-layered 2x lumber, mounting heavy fence rails, or attaching deck components to 4x posts. The 1/4 diameter offers high shear resistance for safety-critical outdoor projects.

Vise-Like Clamping with Partial Threading
Our partially threaded shank features a smooth upper section. This allows the bolt to pull the outer board tightly against the support beam without the threads biting prematurely in the top board. This clamping effect ensures a gap-free, rock-solid joint, preventing the bridging effect common in 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: Recommended to prevent splitting. Use a 1/8 bit for softwoods or 3/16 bit for hardwoods.
¡ñ Why 3 length? Perfect for passing through 1.5 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 3
- Thread: Partially Threaded (Max Clamping)
- Material: 304 Stainless Steel (18-8)
- Drive: 7/16 Hex Head
- Qty: 20 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 tightly together.
• 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 3-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.
• HEAVY-DUTY SHEAR CAPACITY The robust 1/4-inch diameter provides elite structural strength, offering a secure, bolt-level hold for deck posts, pergolas, and heavy framing projects.
• TECHNICAL INSTALLATION To ensure joint integrity, pre-drilling a pilot hole (3/16 for softwoods, 7/32 for hardwoods) is required for consistent seating of these long 3-inch bolts.

Specifications

• ASIN: B0F21DRYLQ
• Internal SKU: IMS0620
• Size: 1/4" x 3"
• Material: Stainless Steel
• Finish: Stainless Steel
• Head Style: Hex
• Package Quantity: 20