AIA/NAS 1737-2012 pdf download INSTALLATION TORQUE LIMITS FOR 1 60 KSI THREADED FASTENER SYSTEMS SUBJECT TO PERIODIC REMOVAL
SCOPE
53GP
This standard practice establishes standard installation torque limits for 160 ksi threaded fasteners which are used inairframe applications where periodic removal is required.
REFERENCE DOCUMENTS
The following documents form a part of this standard practice to the extent specified herein:
Aerospace Industries Association
NASM33750Recess Hi-Torque,Dimensions of Recess,Gage,and Driver ForNASM33781Recess – Torgq-Set, Dimensions of Recess, Gage and Driver ForNAS4000Recess, Tri-Wing, Dimensions of Recess and Gages
Copies can be obtained from the Aerospace lndustries Association, 1000 Wilson Blvd, Suite 1700, Arlington, VA22209.www.aia-aerospace.org
DEFINITIONS
Threaded Fastener: As used in this standard practice, this term indicates a bolt or screw.
Tension Type Fasteners: As used in this standard practice, this term indicates those threaded fasteners with a headdiameter of approximately two times the shank diameter.
Reduced Head Fasteners: As used in this standard practice, this term indicates those threaded fasteners with a headdiameter of approximately 1 .5 times the shank diameter.
GENERAL REQUIREMENTS
The torque limits shown in Table are intended for use with NASM33750, NASM33781, and NAS4000 type highperformance recesses.
The torque limits listed in Table I are for head side rotation. These values are also satisfactory for nut side torqueapplication.
For torque control power tools, use the nominal torque limit to the upper torque limit listed in Table l. Torque controlpower tools must be limited to 500 rpm aximum.
Installation torque limits specified by the engineering drawing take precedence over the torque limits in Table l.
DETAIL REQUIREMENTS
Installation torque limits for 160 ksi threaded fastener systems subject to periodic removal

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