[500 BULK] Steel Black Oxide & Oil Carriage Bolts 1/4-20 X 3-1/2

Designed for dependable wood-to-wood fastening, the Steel Black Oxide & Oil Carriage Bolts 1/4-20 x 3-1/2" deliver strong, lasting performance with a sleek, low-glare finish. Ideal for furniture, decking, framing, and other wood assemblies, these carriage bolts combine durability with easy installation.

Key features

• Material: Steel for reliable strength and durability
• Finish: Black oxide with oil coating for corrosion resistance and a discreet appearance
• Size: 1/4-20 thread with 3-1/2" length
• Head style: Carriage bolt with a round head and square neck to prevent turning during installation
• Applications: Ideal for wood-to-wood assemblies in furniture, decks, frames, and more

Technical specifications

• Diameter: 1/4" (6.35 mm)
• Thread: 1/4-20 UNC
• Length: 3-1/2"
• Finish: Black oxide with oil on steel
• Head type: Carriage bolt

Why choose this carriage bolt?

These bolts offer excellent holding power in both softwood and hardwood, quick DIY-friendly installation, and a durable finish that resists wear and corrosion. The square neck helps prevent rotation during tightening, ensuring a secure, flush fit in your project.

Whether you’re building a sturdy outdoor deck, assembling a wooden frame, or repairing furniture, the Steel Black Oxide & Oil Carriage Bolts 1/4-20 x 3-1/2" deliver dependable performance with a clean, professional look.