3/8"-24 Flat Head Cap Screws

3/8-24 Flat Head Socket Cap Screws in all available lengths, grades, materials, and finishes. This collection covers every 3/8-24 option in stock — use the filters to narrow by length, grade, material, and finish.

3/8-24 Thread Specifications

• Nominal diameter: 0.375"
• Threads per inch: 24
• Tap drill (75% thread): Q (0.332")
• Clearance hole (close fit): 25/64" (0.391")
• Clearance hole (free fit): 13/32" (0.406")

To thread a 3/8-24 hole, drill with a Q (0.332") tap drill for a standard 75% thread. For a clearance hole that the 3/8-24 screw passes through, use 25/64" (0.391") for a close fit or 13/32" (0.406") for a free fit. Pair with a matching 3/8-24 nut or tapped hole.

Orders before 12 PM ET ship same day.