EFFECT OF SELF-LOCKING NUTS ON TORQUE-TENSION RELATIONSHIP

Testing was conducted to determine torque-tension relationship for self-locking nuts. The test results indicated that torque wrench method is not accurate for determining preload when fasteners are preloaded to 75-80 percent of their ultimate tensile strength. The accuracy of torque wrench method deteriorates even more if fasteners are used for more than one cycle application. There was also significant difference in preload between all metal nuts and nuts with nonmetallic insert. The fastener preload variation decreased with larger fasteners. (Author)

• Corporate Authors:

  Naval Air Development Center

  Air Vehicle Technology Department
  Warminster, PA  United States 
• Authors:
  • Zurko, M J
• Publication Date: 1975-12-29

Media Info

• Pagination: 76 p.

Subject/Index Terms

• TRT Terms: Airframes; Bolted joints; Bolts; Fastenings; Joints; Loads; Measurement; Nuts; Tensile properties; Tension; Torque
• Old TRIS Terms: Wrenches
• Subject Areas: Bridges and other structures; Materials; Railroads; Vehicles and Equipment;

Filing Info

• Accession Number: 00137227
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: NADC-75359-30 Final Rpt.
• Files: TRIS
• Created Date: Sep 4 1976 12:00AM