1/4"-20 Carriage Bolts

1/4-20 Carriage Bolts in all available lengths, grades, materials, and finishes. This collection covers every 1/4-20 option in stock — use the filters to narrow by length, grade, material, and finish.

1/4-20 Thread Specifications

• Nominal diameter: 0.25"
• Threads per inch: 20
• Tap drill (75% thread): #7 (0.201")
• Clearance hole (close fit): 17/64" (0.266")
• Clearance hole (free fit): 9/32" (0.281")

Pair 1/4-20 carriage bolts with a matching 1/4-20 nut. Use 17/64" (0.266") for a close-fit clearance hole or 9/32" (0.281") for free fit.

Orders before 12 PM ET ship same day.