"IMSCREWS 5/16 x 3 Heavy-Duty Lag Screws - 304 Stainless Steel (20 pcs)

Professional Deep-Core Structural Pro-Pack
Engineered for maximum reach and holding power, these 3-inch bolts are the industrial choice for heavy-duty framing. Our 20-piece contractor pack provides superior shear resistance for large-scale projects, making them perfect for securing double-layered lumber, heavy deck posts, or structural brackets to 4x4 and 6x6 beams.

Vise-Like Clamping Power
Our partially threaded shank features a smooth upper section that allows the bolt to pull 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 Weather Protection
Forged from premium 18-8 (304) stainless steel for elite rust resistance in humid or coastal environments. compatible with ACQ pressure-treated lumber. Prevents unsightly rust streaks on high-value cedar, redwood, or premium outdoor structures.

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 20 pcs? Best value for consistent, multi-point structural installations such as deck framing or large fence builds.

Specs:
- Size: 5/16 x 3
- Thread: Partially Threaded (Max Clamping)
- Material: 304 Stainless Steel
- Drive: 1/2 Hex Head
- Qty: 20 pcs"

Key Features

• ELITE STRUCTURAL CLAMPING The precision-engineered partial thread allows the shank to bypass the first timber member, drawing pieces together for a professional, gap-free joint.
• HEAVY-DUTY SHEAR STRENGTH At 5/16 diameter, these bolts provide professional-grade lateral resistance for structural post-to-beam connections and heavy framing.
• 304 MARINE-GRADE SHIELD Forged from premium 304 (18-8) stainless steel to prevent rust and corrosive staining in cedar, redwood, and ACQ pressure-treated lumber.
• STABLE TORQUE DELIVERY Robust hex head ensures a secure 1/2 socket fit, providing 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: B0F21C822Q
• Internal SKU: IMS0644
• Size: 5/16" x 3"
• Material: Stainless Steel
• Finish: Stainless Steel
• Head Style: Hex
• Package Quantity: 20