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SAE AS4847

Revision A, July 1, 2007

Complete Document

Shank Nuts, Captive Blind Fastener, Mating Retaining Flange, Design Standard For

Includes all amendments and changes through Reaffirmation Notice , November 2012

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Product Details:

  • Revision: Revision A, July 1, 2007
  • Published Date: November 2012
  • Status: Active, Most Current
  • Document Language: English
  • Published By: SAE International (SAE)
  • Page Count: 8
  • ANSI Approved: No
  • DoD Adopted: No

Description / Abstract:

This design standard provides information on the use of self-locking shank nuts, thread sizes. 1640-36 thru 3750-24 together with details of flange hole and abutment shoulder for their installation


To standard on the dimensional particulars of the attachment flange hole, abutment shoulder, and length of shank on the nut.


Primarily for aerospace propulsion system blind bolted applications where high temperature self-locking double hexagon nuts cannot be used.


A self-locking shank nut is held captive by flaring the shank into a countersink in the flanged component. The nut is prevented from turning during the assembly and removal of the bolt by means of a flat on the nut that abuts a machined shoulder on the flanged component part.
AIA/NAS Aerospace Standards