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

Steel Black Oxide & Oil Carriage Bolts 1/4-20 x 3 provide strong, corrosion-resistant fastenings designed for wooden and metal assemblies. These carriage bolts feature a steel core with a durable black oxide finish and an oil coating to reduce friction during installation and improve long-term performance.

Product details

Size: 1/4 inch diameter, 1/4-20 UNC thread, 3 inches long

Key features

• Material: Steel with a black oxide finish
• Finish: Black oxide with oil for lubrication and corrosion resistance
• Head type: Carriage bolt with a domed head and a square neck to prevent turning
• Thread: 1/4-20 UNC
• Length: 3 inches
• Application: Ideal for wood-to-wood and wood-to-metal connections, furniture, decking, cabinetry, and light to moderate structural assemblies

Why choose black oxide & oil finish

The combination of a black oxide finish and oil coating offers a uniform appearance, reduced galling, and improved wear characteristics in mild environments, making these bolts a reliable choice for fast, clean installations.

Ideal uses

Best suited for projects where a flush or decorative head is preferred and a secure, non-rotating connection is required. The square neck grips the workpiece to prevent turning during tightening, while the domed head provides a smooth, finished look.

Installation tips

• Pre-drill a pilot hole to ensure a snug fit and to minimize splitting in wood.
• Insert the bolt and tighten using a nut on the opposite side; use a washer if needed to distribute load.
• Check alignment before final tightening to maintain a clean, flush appearance.