IMSCREWS 1/4 x 3-1/2 Hex Head Lag Screws, 304 Stainless Steel, Partially Threaded Structural Timber Bolts, 5 pcs

"IMSCREWS 1/4 x 3-1/2 Heavy-Duty Lag Screws - 304 Stainless Steel (5 pcs)

Extreme Penetration for Structural Joints
When projects demand deep reach, these 3.5-inch bolts provide the necessary depth for structural framing. Ideal for securing heavy rails to 4x4 posts or joining multiple layers of timber. The 1/4 diameter offers professional shear resistance for outdoor structural nodes.

Vise-Like Clamping Power
Our partially threaded shank features a smooth upper section that pulls the outer board tightly against the base beam. This clamping effect creates a gap-free, rock-solid joint, eliminating the bridging effect common in extra-long full-thread screws.

304 Stainless Protection
Premium 18-8 (304) stainless steel resists rust in humid or coastal environments. compatible with ACQ pressure-treated lumber. Prevents unsightly rust streaks on high-value cedar, redwood, or deck framing.

FAQ
• Tools: Fits a standard 7/16 hex socket or wrench.
• Pre-drilling: Mandatory for this length. Use a 1/8 bit for softwoods or 3/16 for hardwoods to prevent splitting.
• Why 3.5 length? Optimized for passing through 1.5 or 2 timber with a massive 1.5 + thread anchor in the base post.

Specs:
- Size: 1/4 x 3-1/2
- Thread: Partially Threaded (Max Clamping)
- Material: 304 Stainless Steel
- Drive: 7/16 Hex Head
- Qty: 5 pcs"

Key Features

• ELITE CLAMPING POWER The partially threaded design ensures the smooth shank bypasses the outer board, pulling timber members together for a rock-solid, gap-free joint.
• IDEAL FOR 2x LUMBER At 3.5 inches long, these bolts provide the perfect structural depth for connecting 2x4 or 2x6 lumber to support posts without over-penetration.
• 304 EXTERIOR DEFENSE Forged from premium 304 (18-8) stainless steel to prevent rust and staining in cedar, redwood, or ACQ pressure-treated lumber.
• STABLE TORQUE INTERFACE Precision hex head ensures a secure 7/16 socket fit, offering stable torque transfer for controlled seating in dense timber cores.
• TECHNICAL SPECIFICATION To prevent splitting and protect the 1/4 shaft, pre-drilling a pilot hole (3/16 for softwoods, 7/32 for hardwoods) is mandatory.

Specifications

• ASIN: B0F21C3K64
• Internal SKU: IMS0621
• Size: 1/4" x 3-1/2"
• Material: Stainless Steel
• Finish: Stainless Steel
• Head Style: Hex
• Package Quantity: 5