PART NUMBER:
NA2455
FEDERAL SUPPLY CODE:
32387
NA2455 Miniature Sealed Dome Nut – Stressnut / NAS1474
NUT-DOME, SEALED, MINIATURE, SELF-LOCKING, STRESS-RELIEVING, FLOATING, RIVETLESS, 900MPa
MATERIAL:
-
NUT
-Carbon or alloy steel per NASM25027. -CRES A-286 (UNS S66286) per AMS5525, AMS5731, AMS5732, AMS5734 orAMS5737.
-
SHELL
-Carbon steel per NASM25027. -CRES A-286 (UNS S66286) per AMS5525.
-
WASHER
Aluminum alloy or steel per NASM25027. -CRES A-286 (UNS S66286) perAMS5731, AMS5732, AMS5734 or AMS5737.
-
SEAL
-120 DEGREES C: Rubber per MIL-PRF-6855, class I, grade 60, durometer A60, color black. -175 DEGREES C: Fluorosilicone rubber per MIL-DTL-25988, type II, class I, durometer A70, color blue.
-
RETAINER
-Titanium 6AL4V (UNS R56400) per AMS4911. -17-4 PH (H1025, UNS S17400) per AMS5643.
FINISH:
-
STEEL NUT, SHELL AND WASHER
Cadmium plate per AMS-QQ-P-416, type II, class 2.
-
CRES NUT, SHELL AND WASHER
Clean and passivate per MIL-DTL-5002.
-
NUT (WHEN CODED "C")
Silver plate per AMS2410.
-
ALUMINUM ALLOY WASHER
Anodize or chemical film per NASM25027, except anodize shall be limited to type I or type II.
-
TITANIUM AND 17-4 PH RETAINER
Passivate per AMS2700.
LUBRICATION:
-
DRY FILM LUBRICANT
Approved dry film lubricant on nuts when coded as shown in material code section.
CODES:
-
"A" CODE
Steel nut and shell with aluminum alloy or steel washer, fuel-resistant MIL-PRF-6855 seal (120 DEG. C), dry film lubricated.
-
"X" CODE
Same as "A" code without dry film lubricant.
-
"S" CODE
Steel nut, shell and washer, fuel-resistant MIL-DTL-25988 seal (175 DEG. C), dry film lubricated.
-
"Y" CODE
Same as "S" code without dry film lubricant.
-
"C" CODE
CRES nut (silver plated), shell and washer, non-fuel-resistant AMS3304 seal (230 DEG. C).
-
"R" CODE
CRES nut, shell and washer, fuel-resistant MIL-PRF-6855 seal (120 DEG. C), dry film lubricated.
-
"F" CODE
CRES nut, shell and washer, fuel-resistant MIL-DTL-25988 seal (175 DEG. C), dry film lubricated.
-
RETAINER
For 17-4 PH material, replace "T" code in part number with "S".
Marketing Summary
PART #: NA2455
- Dome Nut
- Sealed
- Miniature
- Self-Locking
- Stress-Relieving
- Floating
- Rivet-less
- 900MPa
Notes:
- Minimum radial float 0,38. Maximum axial float 0,75. Thread element shall be capable of engagement with a bolt in the maximum misaligned position.
- Nut, shell and retainer shape optional, within specified dimensions.
- /3/ Shell shall be marked with NAFCO USA, LLC manufacturing mark “N” and with “C” for CRES material. Markings shall be raised or depressed 0,25 maximum. Location optional except must be visible after assembly.
- Threads shall be in accordance with FED-STD-H28/21 prior to lubrication. The upper threaded portion of the nut shall be deformed to provide self-locking feature.
- Dimensions in millimeters and apply after finish and prior to the application of lubrication unless otherwise specified.
- Dimensioning and tolerancing per ANSI Y14.5M-1982.
- /7/ Retainer shank length. Replace with exact length of application thickness. Manufactured length will be adjusted by NAFCO USA, LLC to account for growth during installation (see section 2.9).
- Pressure range: 0 to0.35 MPa.
- Temperature range:
- MIL-PRF-6855 rubber (-50 degrees C to 120 degrees C)
- MIL-DTL-25988 fluorosilicone rubber (-50 degrees C to 175 degrees C)
- AMS3304 rubber (-50 degrees C to 230 degrees C)
- For CRES nuts, magnetic permeability shall be less than 2.0 (air = 1.0) for a field strength of H=200 Oersteds using a magnetic permeability indicator per ASTM A342/A342M, test method 3.
- Performance shall be tested per NAS1474.
- See example callout for description of part number and how to indicate oversize or nominal retainer configuration.
- Minimum I.D. of nut retainer after assembly.
