Metric thread andinch threadStandards
Type of units Type of pitch
metric coarse threadmetric threadcoarsemetric fine pitch threadfineUNC threadinch threadcoarseUNF threadfineMetric thread:Triangular screw thread. Diameter and pitch are indicated as mm.60 degrees thread angle.Inch thread:Triangular screw thread. Pitch is indicated as thread/inch.Coarse thread:Combination of diameter and pitch is general and used most often.Fine thread:This thread type screw is used for special uses.