Steel plain finish

Coarse (standard) thread

• 1/4"-20
• 5/16"-18
• 3/8"-16
• 7/16"-14
• 1/2"-13
• 9/16"-12
• 5/8"-11
• 3/4"-10
• 7/8"-9
• 1"-8
• 1-1/8"-7
• 1-1/4"-7
• 1-1/2"-6
• 1-3/4"-5
• 2"-4.5
• 2-1/2"-4

Fine thread

• 1/4"-28
• 5/16"-24
• 3/8"-24
• 7/16"-20
• 1/2"-20
• 5/8"-18
• 3/4"-16
• 7/8"-14
• 1"-14 ^