7/8"-9 Flat Head Cap Screws

7/8-9 Flat Head Socket Cap Screws in all available lengths, grades, materials, and finishes. This collection covers every 7/8-9 option in stock — use the filters to narrow by length, grade, material, and finish.

7/8-9 Thread Specifications

• Nominal diameter: 0.875"
• Threads per inch: 9
• Tap drill (75% thread): 49/64" (0.766")
• Clearance hole (close fit): 57/64" (0.891")
• Clearance hole (free fit): 29/32" (0.906")

To thread a 7/8-9 hole, drill with a 49/64" (0.766") tap drill for a standard 75% thread. For a clearance hole that the 7/8-9 screw passes through, use 57/64" (0.891") for a close fit or 29/32" (0.906") for a free fit. Pair with a matching 7/8-9 nut or tapped hole.

Orders before 12 PM ET ship same day.