IMSCREWS 1/4 x 3-1/2 Hex Head Lag Screws, 304 Stainless Steel, Partially Threaded Structural Timber Bolts, 20 pcs
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"IMSCREWS 1/4 x 3-1/2 Heavy-Duty Lag Screws - 304 Stainless Steel (20 pcs)
Extreme Reach for Structural Projects Our 20-piece pro-pack is designed for large-scale framing and deep-core anchoring. These 3.5-inch bolts provide the necessary depth for securing heavy rails to 4x4 posts or joining multi-layered timber. The 1/4 diameter ensures high shear resistance for safety-critical joints.
Vise-Like Clamping Power Our partially threaded shank features a smooth upper section that pulls the outer board tightly against the support beam. This creates a gap-free, rock-solid joint, eliminating the bridging effect common in long full-thread screws for a professional-grade finish.
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
¡ñ Tools: Fits a standard 7/16 hex socket or wrench. ¡ñ Pre-drilling: Recommended. Use a 1/8 bit for softwoods or 3/16 for hardwoods to prevent splitting. ¡ñ Why 3.5 length? Perfect for passing through 1.5 or 2 timber with a deep 1.5 + thread anchor.
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.
