PART NUMBER:

NA2172

FEDERAL SUPPLY CODE:

32387

NA2172 DOMENUT / NAS1474

TWO LUG, SELF SEALING, SELF LOCKING, FLOATING NUT ELEMENT

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Specifications
MATERIAL:
  • Nut

    Carbon or alloy steel. A286 CRES per AMS5525 or AMS5732

  • Dome

    Carbon steel grade C1050 per AMS5085. A286 CRES per AMS5525

  • Washer

    Aluminum alloy or alloy steel. A286 CRES per AMS5732

  • Seal -- 225 Degrees F

    Rubber, MIL-R-6855, Class I, Grade 60, durometer A60, color black

  • Seal -- 350 Degrees F

    Fluorosilicone rubber, MIL-R-25988, Type II, Class I, durometer A70, color blue

  • Seal -- 450 Degrees F

    Silicone rubber, AMS3304, durometer A70, color red

FINISH:
  • A Code

    Steel nut and dome with aluminum alloy or steel washer, fuel resistant MIL-R-6855 seal (225 degrees F). Steel nut, dome and washer CAD plate per AMS-QQ-P-416, Type II, Class 2. Aluminum washer nalodine per MIL-C-5541. Nut dry-film lubricant per MIL-L-46010 over CAD plate.

  • S Code

    Steel nut, dome and washer. Fuel resistant per MIL-R-25988 seal (350 degrees F). Steel nut, dome and washer CAD plate per AMS-QQ-P-416 Type II, Class 2. Nut dry-film lubricant per MIL-L-46010 over CAD plate.

  • X Code

    Same as "A" code without dry-film lubricant.

  • Y Code

    Same as "S" code without dry-film lubricant.

  • C Code

    A286 CRES nut, dome and washer passivate per AMS-QQ-P-35. Nut silver plate per AMS2410. Non-fuel resistant AMS3304 seal (450 degrees F).

  • F Code

    A286 CRES nut, dome and washer passivate per AMS-QQ-P-35. Nut dry-film lubricant per MIL-L-46010. Fuel resistant MIL-R-25988 seal (350 degrees F).

  • R Code

    A286 CRES nut, dome and washer passivate per AMS-QQ-P-35. Nut dry-film lubricant per MIL-L-46010. Fuel resistant MIL-R-6855 seal (225 degrees F).

SERVICE TEMP.:
  • MIL-R-6855 Rubber

    65 degrees F to 250 degrees F

  • MIL-R-25988 Fluorosilicone Rubber

    65 degrees F to 350 degrees F

  • AMS3304 Rubber

    65 degrees F to 450 degrees F

VARIATIONS:
  • K Code

    Add after dash number for optional stiffening flange.

  • N Code

    Add after dash number for no stiffening flange.

  • No Code

    Stiffening flange at manufacturer’s option.

  • Z Code

    Add after dash number for dome and washer to be coated with a galvanic reaction resistant coating per NAS4006. Shall be identified with a permanent spot, dab or patch of yellow independent #73X ink applied to top of dome.

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Product Information

Marketing Summary

PART #: NA2172

  • Two Lug
  • Self-Sealing
  • Self-Locking
  • Floating Nut Element
  • The dome of this assembly prevents wire abrasion, traps metallic flakes and protects bolt threads against contamination.

Part Number Example Callout

NA2172C – 02 KZ:

NA2172 = Basic Part Number
C = A286 Nut, Dome and Washer
-02 = .1900-32 UNJF-3B Thread
K = Stiffening Flange Required
Z = Dome and Washer Coated with Galvanic Reaction Resistant Coating

Notes:

  1. Minimum radial float shall be .015. Maximum axial float shall be .030.
  2. Nut element shall be capable of engagement with a bolt in the maximum misaligned position.
  3. Pressure range is 0 to 50 PSI.

Specifications

MATERIAL
  • Nut:

    Carbon or alloy steel. A286 CRES per AMS5525 or AMS5732

  • Dome:

    Carbon steel grade C1050 per AMS5085. A286 CRES per AMS5525

  • Washer:

    Aluminum alloy or alloy steel. A286 CRES per AMS5732

  • Seal -- 225 Degrees F:

    Rubber, MIL-R-6855, Class I, Grade 60, durometer A60, color black

  • Seal -- 350 Degrees F:

    Fluorosilicone rubber, MIL-R-25988, Type II, Class I, durometer A70, color blue

  • Seal -- 450 Degrees F:

    Silicone rubber, AMS3304, durometer A70, color red

FINISH
  • A Code:

    Steel nut and dome with aluminum alloy or steel washer, fuel resistant MIL-R-6855 seal (225 degrees F). Steel nut, dome and washer CAD plate per AMS-QQ-P-416, Type II, Class 2. Aluminum washer nalodine per MIL-C-5541. Nut dry-film lubricant per MIL-L-46010 over CAD plate.

  • S Code:

    Steel nut, dome and washer. Fuel resistant per MIL-R-25988 seal (350 degrees F). Steel nut, dome and washer CAD plate per AMS-QQ-P-416 Type II, Class 2. Nut dry-film lubricant per MIL-L-46010 over CAD plate.

  • X Code:

    Same as "A" code without dry-film lubricant.

  • Y Code:

    Same as "S" code without dry-film lubricant.

  • C Code:

    A286 CRES nut, dome and washer passivate per AMS-QQ-P-35. Nut silver plate per AMS2410. Non-fuel resistant AMS3304 seal (450 degrees F).

  • F Code:

    A286 CRES nut, dome and washer passivate per AMS-QQ-P-35. Nut dry-film lubricant per MIL-L-46010. Fuel resistant MIL-R-25988 seal (350 degrees F).

  • R Code:

    A286 CRES nut, dome and washer passivate per AMS-QQ-P-35. Nut dry-film lubricant per MIL-L-46010. Fuel resistant MIL-R-6855 seal (225 degrees F).

SERVICE TEMP.
  • MIL-R-6855 Rubber:

    65 degrees F to 250 degrees F

  • MIL-R-25988 Fluorosilicone Rubber:

    65 degrees F to 350 degrees F

  • AMS3304 Rubber:

    65 degrees F to 450 degrees F

VARIATIONS
  • K Code:

    Add after dash number for optional stiffening flange.

  • N Code:

    Add after dash number for no stiffening flange.

  • No Code:

    Stiffening flange at manufacturer’s option.

  • Z Code:

    Add after dash number for dome and washer to be coated with a galvanic reaction resistant coating per NAS4006. Shall be identified with a permanent spot, dab or patch of yellow independent #73X ink applied to top of dome.