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Plate Self-locking Nut

NSN: 5310-00-283-4618 | Model: F18421-1-4

A nut with a flanged base of varied shapes which may be plain or mounted by rivets, bolts, welding or integral prongs. An integral feature is incorporated for locking on the threads of a mating member.

NSN Properties and Flags
NATO Stock Number
Thread Class
Thread Direction
Locking Feature
Prevailing torque all metal design
Counterbore Diameter
0.254 inches nut
Mounting Hole Diameter
Between 0.098 inches and 0.103 inches
Nut Style
Nut Length
1.292 inches
Nut Height
0.286 inches
Plate Thickness
Between 0.028 inches and 0.036 inches
Plate Width
0.574 inches
Nut Counterbore Depth
0.070 inches nut
Nut Mounting Provision
Straight holes
Mounting Hole Arrangement Style
2 holes
Distance From Aperture Center To Mounting Hole Center
Between 0.495 inches and 0.505 inches
Center To Center Distance Between Mounting Holes Along Length
Between 0.998 inches and 1.002 inches
Thread Series
Features Provided
Floating nut
Thready Qty Per Inch (tpi)
Thread Size
0.250 inches
Iron alloy 660 shell
Material Specification
Ams5735 assn standard single material response shell
Surface Treatment
Passivate shell
Specification Data
76301-st3-443 manufacturers standard

Pricing and Availability

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NSN 5310-00-283-4618 Datasheet

Supply Class (FSC):
Nuts And Washers
Cross Reference:
  • F18421-1-4
  • NAS1791C4-1
  • ST3M443-4A1
  • BFN443-4-1
  • F49249E4-1
  • NS202041-048-1
  • F49249E4-4-1
  • F49249-4-1
  • F49249E4-1
  • F49249E4-4-1
  • 3929AS1225-3A1
  • F18421L1-4
  • F18421L1-4
  • F18421-1-4
  • F49249E4-1
  • F49249E4-4-1
  • F49249-4-1
  • 10121270
Cage Codes:
  • Fitz Aerospace, Llc (CAGE 019L2)
  • National Aerospace Standards (CAGE 80205)
  • Boeing Company, The (CAGE 76301)
  • Bristol Industries (CAGE 27238)
  • Arconic Global Fasteners & Rings, (CAGE 15653)
  • Sps Technologies, Llc (CAGE 80539)
  • Satair A/s (CAGE R1120)
  • Naval Air Systems Command (CAGE 30003)
  • Harvard Industries Inc (CAGE 72962)
  • Arconic Global Fasteners & Rings, (CAGE 75237)
  • Nimikkeistokeskus Ncb Finland (CAGE A486G)
  • 5310-00-283-4618 replaces 5310-01-090-5557

N - Indicates there is no data in the hmirs and the nsn is in a fsc not generally suspected of containing hazardous materials.


U - Precious metal content is unknown


- The item does not have a nuclear hardened feature or any other critical feature such as tolerance, fit restriction or application.

Freight Information:
  • NMFC:

    013540 - Alum nuts

  • WCC:

    713 - Metal hardware

  • SHC:

    9 - Other or no special handling required (sh)

  • ADC:

    A - Shipment is not a consolidation and does not exceed 84 inches in any dimension.

  • ACC:

    B - Construction materials: includes paint and related materials, prefabricated building, wood products, metal and composition mater

  • LTL:

    Q - 70.0

  • TCC:

    Z - No special type of cargo code applicable

NSN Management Codes:
  • SOS
  • AAC
  • Quantity per pack
  • Unit of Measure
  • Shelf Life
  • Classification Control
  • Repariability
    This is a nonreparable item. if condemned or economically unserviceable, then dispose at the level authorized replace the item.

Questions & Answers:

What are the historical prices recorded for this stock number?
Historical data shows pricing from $9.64 to $16.07..
Does NSN 5310-00-283-4618 have a shelf life?
No. There is no shelf life applicable for this NSN.
What NATO entities are users of this NSN?
Department Of The Air Force, U.s. Marine Corps, Department Of The Navy, Finland, Poland, Spain, Columbia, Singapore, Malaysia, Australia, Canada, Germany, Republic Of Korea, United Kingdom, Netherlands, Italy, Denmark, Greece, and Turkey
What is the NIIN of NSN 5310-00-283-4618?
002834618 or 00-283-4618
Does NSN 5310-00-283-4618 require demilitarization?
Yes - ITAR Controlled
What is the most recent solicitation for NSN 5310-00-283-4618?
No solicitations for this NSN.
When was this national stock number assigned to the federal catalog?
Oct 19, 1973