American Unified Thread Specifications

3/4 - 10 - UNC - 2A

• 3/4 — Nominal diameter in inches
• 10 — Threads per inch
• UNC — Thread series:
  • UNC = Unified Coarse
  • UNF = Unified Fine
• 2 — Class of fit (optional)
• A — Thread type (optional):
  • A = External
  • B = Internal