"IMSCREWS 5/16 x 2-1/2 Heavy-Duty Lag Screws - 304 Stainless Steel (5 pcs)

Heavy-Duty Structural Anchoring
The 5/16 diameter offers significant industrial-grade shear strength for critical load-bearing joints. At 2.5 inches, these bolts are the professional choice for joining standard 2x lumber (1.5 thick) to 4x4 posts, ensuring deep penetration and a rock-solid connection for deck railings, gates, and pergolas.

Vise-Like Clamping Power
Our partially threaded shank features a smooth upper section that allows the bolt to pull the outer timber tightly against the support beam. This clamping effect ensures a gap-free, permanent joint, eliminating the bridging effect where boards remain loose—a common issue with long full-thread screws.

304 Stainless Weather Protection
Forged from premium 18-8 (304) stainless steel for superior rust resistance in outdoor or humid environments. compatible with ACQ pressure-treated lumber. Prevents unsightly rust streaks on high-value cedar, redwood, or premium deck framing.

FAQ
¡ñ Tools: Fits a standard 1/2 hex socket or wrench.
¡ñ Pre-drilling: Recommended. Use a 3/16 bit for softwoods or 7/32 bit for hardwoods to prevent timber splitting.
¡ñ Why 2-1/2 length? Optimized for passing through 1.5 timber with a deep 1 thread anchor in the base post for maximum stability.

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

Key Features

• MAXIMUM STRUCTURAL CLAMPING The precision partial thread design allows the shank to bypass the outer beam, pulling lumber together for a rock-solid, gap-free structural joint.
• DEEP-ANCHOR STABILITY At 2.5 inches long, these bolts offer superior penetration for securing 2x lumber to structural posts, providing elite withdrawal resistance.
• PREMIUM 304 CORROSION SHIELD Forged from 304 (18-8) stainless steel to prevent rust and staining in cedar, redwood, and pressure-treated lumber.
• HIGH-TORQUE DRIVE INTERFACE Robust hex head ensures a secure 1/2 socket fit, delivering steady torque for controlled installation in dense hardwoods.
• TECHNICAL INSTALLATION SPEC To ensure structural safety and prevent splitting, pre-drilling a pilot hole (7/32 for softwoods, 1/4 for hardwoods) is mandatory.

Specifications

• ASIN: B0F21BGS8Y
• Internal SKU: IMS0639
• Size: 5/16" x 2-1/2"
• Material: Stainless Steel
• Finish: Stainless Steel
• Head Style: Hex
• Package Quantity: 5