Self-locking hexagon nut (locknut) with Unified National Fine (UNF) thread, an American screw thread with fine pitch. Fitted with a nylon ring to prevent loosening due to vibration etc. Thread diameter1 Inch Thread typeUNF Wrench/Spanner size1-1/2 Inch Height27.6 mm MaterialSteel Surface treatmentZinc-plated Quality8.8 DIN standard985
