"IMSCREWS 5/16 x 4-1/2 Heavy-Duty Lag Screws - 304 Stainless Steel (20 pcs)

Extreme Structural Penetration Pro-Pack
Our 4.5-inch lag bolts are designed for extra-thick timber assemblies and deep-core anchoring. This 20-piece contractor pack provides the robust 5/16 diameter needed for professional-grade shear resistance, making these the ideal choice for securing heavy beams, landscaping ties, or large structural brackets to 6x6 posts.

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 structure. This creates a gap-free, rock-solid joint, eliminating the bridging effect common in extra-long full-thread screws for a professional-grade finish.

304 Stainless Weather Protection
Forged from premium 18-8 (304) stainless steel for elite rust protection in outdoor and 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: Mandatory for this length. Use a 3/16 bit for softwoods or 7/32 for hardwoods to prevent timber splitting.
¡ñ Why 4-1/2 length? Optimized for passing through 2.5 or 3 timber with a deep 1.5 + thread anchor in the base beam.

Specs:
- Size: 5/16 x 4-1/2
- Thread: Partially Threaded (Max Clamping)
- Material: 304 Stainless Steel
- Drive: 1/2 Hex Head
- Qty: 20 pcs"

Key Features

• MAXIMUM CLAMPING FORCE Engineered partial thread allows the smooth shank to bypass outer boards, pulling thick timbers together for a gap-free, rock-solid structural joint.
• ELITE DEEP-CORE ANCHORING The 4.5 reach is optimized for securing multi-layer lumber into structural posts, providing elite withdrawal and shear resistance.
• 304 EXTERIOR SHIELD Forged from premium 304 (18-8) stainless steel to prevent rust and corrosive staining in cedar, redwood, or ACQ pressure-treated lumber.
• STABLE TORQUE DELIVERY Robust hex head ensures a secure 1/2 socket fit, delivering maximum torque transfer for controlled installation in dense hardwoods.
• TECHNICAL SPECIFICATION To ensure structural safety and prevent splitting, pre-drilling a pilot hole (7/32 for softwoods, 1/4 for hardwoods) is mandatory.

Specifications

• ASIN: B0F21DMHL7
• Internal SKU: IMS0653
• Size: 5/16" x 4-1/2"
• Material: Stainless Steel
• Finish: Stainless Steel
• Head Style: Hex
• Package Quantity: 20