IMSCREWS 5/16"-18 x 1-1/4" Heavy-Duty 304 Stainless Steel Carriage Bolts (5 PCS)

Reliable Fastening for Medium-Duty Structural Connections
The IMSCREWS 5/16" x 1-1/4" carriage bolt is designed for projects requiring reliable shear resistance in a versatile medium-short size. With a robust 5/16-inch diameter, these bolts are well-suited for load-bearing joints where stability is critical, such as assembling heavy furniture, mounting garden brackets, or joining 1-inch thick timber sections. Built for durability, they offer the stability necessary for long-term use in outdoor and indoor structures.

High Durability and Safety-Focused Design
Forged from 18-8 (304) stainless steel, these fasteners are highly resistant to corrosion in humid environments and are compatible with pressure-treated lumber. The smooth round head offers a clean appearance that reduces snagging hazards, making them an ideal choice for railings, play sets, and benches. The integrated square neck prevents the bolt from spinning, allowing for easy, one-sided installation with a single wrench from the nut side.

Specifications:
- Thread: 5/16"-18 Coarse; Length: 1-1/4" (Under Head)
- Material: 304 (18-8) Stainless Steel; Full Thread

FAQ:
Q: Drill bit size? A: A 5/16" bit provides a snug, structural fit.
Q: Coastal safe? A: Yes, 304 SS offers high resistance to salt air corrosion.

Pro-Tips:
1. Ensure the square neck is fully seated in the pre-drilled hole for a secure, anti-spin installation.
2. Pair with a flat washer on the nut side to distribute structural load and protect material surfaces.

Key Features

• PREMIUM 304 STAINLESS STEEL Crafted from high-quality 18-8 (304) stainless steel, these carriage bolts offer superior rust and corrosion protection. Ideal for long-term outdoor, coastal, and marine applications.
• INCREASED 5/16 LOAD STRENGTH The robust 5/16 inch diameter provides higher shear strength and load-bearing capacity than standard 1/4 bolts. Well-suited for structural projects where stability is key.
• VERSATILE 1-1/4 FULL THREAD Featuring a full thread design, these 1.25-inch bolts provide maximum flexibility for various material thicknesses. It ensures a secure fit whether joining wood-to-wood or metal-to-wood.
• SELF-LOCKING SQUARE NECK Features a precision square neck that bites into wood to prevent spinning. This allows for easy one-sided tightening, while the smooth round head ensures a safe, snag-free finish.
• SPECIFICATIONS & NOTE Package includes 5 pieces of 5/16-18 x 1-1/4 carriage bolts only. Nuts and washers are NOT included. We recommend pre-drilling a 5/16 hole for a professional fit.

Specifications

• ASIN: B0F2F5ZM43
• Internal SKU: IMS0786
• Size: 5/16"-18 x 1-1/4"
• Material: Stainless Steel
• Finish: Stainless Steel
• Head Style: Round
• Package Quantity: 5