PART NUMBER:

NA2397

FEDERAL SUPPLY CODE:

32387

NA2397 STRESSNUT

STRESSNUT, FLOATING, EXPANDING, SAE REPLACEABLE NUT ELEMENT, VARIABLE COUNTERBORE, STRESS RELIEVING FASTENER

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Specifications
MATERIAL:
  • NUT ELEMENT

    CRES A286 (UNS S66286) per AMS5525, AMS5732 or AMS5737.

  • RETAINER

    Titanium 6AL4V (UNS R56400) per AMS 9411 or 17-4 PH (H1025, UNS S17400) per AMS5643.

  • RETAINING CLIP

    XM-28 stainless steel spring wire (UNS S24100) per ASTM A313/A313M.

FINISH:
  • NUT ELEMENT

    -Type A286 CRES (450 degrees Fahrenheit): Passivate per AMS2700 plus dry film lubricant per AS5272. -Type A286 CRES (800 degrees Fahrenheit): Passivate per AMS2700 plus silver plate per AMS2410.

  • RETAINER

    Passivate per AMS2700.

  • RETAINING CLIP

    Passivate per AMS2700.

CODES:
  • "M" CODE

    Following base part number indicates dry film lubricant on nut.

  • "S" CODE

    Following base part number indicates silver plate on nut.

  • RETAINER MATERIAL- "S" CODE

    Replace "T" in part number to indicate 17-4 PH retainer material.

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Product Information

Marketing Summary

PART #: NA2397

  • Stressnut
  • Floating
  • Expanding
  • SAE Replaceable Nut Element
  • Variable Counterbore
  • Stress Relieving Fastener
Prefix

Part Number Example Callout

NA2397 M – 032 OS – I – II – 4 – ( ) :

NA2397 = Basic Part Number
M = Nut Finish Code (See Code Section)
– 032 = Thread Size (See Table I)
OS = Oversize Material Configuration –
(Leave Blank if Normal Configuration is Desired)
– I = Nutplate Material
– II = Class II Fit
– 4 = Counterbore Depth “L” and Overall Height “E” (See Table I)
( ) = Retainer Shank Length

Notes:

  1. All dimensions are in inches and apply after finish and prior to the application of lubricant unless otherwise specified.
  2. /2/ Minimum I.D. of nut retainer after assembly.
  3. /3/ Float of nut element shall not be less than .030 radially from centered position. Nut element shall be capable of engagement with a bot in the maximum misaligned position.
  4. /4/ Replaceable nut components:
    1. Nut Element
    2. Retaining Clip
  5. Threads shall be in accordance with AS8879. The upper portion of the nut shall be deformed to produce self-locking feature.
  6. The inclusion of lubricant on the retainers and retaining clips of lubricated nuts is optional.
  7. /7/ Retainer shall be marked with NAFCO USA, LLC manufacturing mark “N” and with “T” for titanium 6AL4V material. Markings shall be raised or depressed .010 inch maximum. Location optional except must be visible after assembly.
  8. /8/ Retainer shank length. Replace with exact length of application thickness. Manufactured length will be adjusted by NAFCO to account for growth during installation (see section 2.9).
  9. /9/ Axial tensile strength, torque-out and push-out values shall be tested IAW NASM25027 and NAS1791.
  10. /10/ See example callout for description of part number and how to indicate oversize or nominal retainer configuration.

Specifications

MATERIAL
  • NUT ELEMENT:

    CRES A286 (UNS S66286) per AMS5525, AMS5732 or AMS5737.

  • RETAINER:

    Titanium 6AL4V (UNS R56400) per AMS 9411 or 17-4 PH (H1025, UNS S17400) per AMS5643.

  • RETAINING CLIP:

    XM-28 stainless steel spring wire (UNS S24100) per ASTM A313/A313M.

FINISH
  • NUT ELEMENT:

    -Type A286 CRES (450 degrees Fahrenheit): Passivate per AMS2700 plus dry film lubricant per AS5272. -Type A286 CRES (800 degrees Fahrenheit): Passivate per AMS2700 plus silver plate per AMS2410.

  • RETAINER:

    Passivate per AMS2700.

  • RETAINING CLIP:

    Passivate per AMS2700.

CODES
  • "M" CODE:

    Following base part number indicates dry film lubricant on nut.

  • "S" CODE:

    Following base part number indicates silver plate on nut.

  • RETAINER MATERIAL- "S" CODE:

    Replace "T" in part number to indicate 17-4 PH retainer material.