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Hexagon Extended Washer Self-locking Nut

NSN: 5310-00-159-1577 | Model: MS51988-3

A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery. 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
Washer Outside Diameter
0.560 inches
Dry film lubricant
Overall Height
0.300 inches
Nut Style
Washer Thickness
Between 0.040 inches and 0.060 inches
Width Across Flats
Between 0.4280 inches and 0.4385 inches
Thread Series
Thready Qty Per Inch (tpi)
Hardness Rating
Between 24.0 rockwell c and 32.0 rockwell c
Thread Size
0.250 inches
Surface Treatment
Cadmium and chromate
Surface Treatment Specification
Qq-p-416, type 2, cl 3 federal specification single treatment response

Inventory Check

The last inventory check on this NSN was done on 06/10/2021. Due to rapid changes in inventory this may not be the current stock qty.

  • New Surplus: 315
  • As Removed: 1
  • New: 15763

Pricing and Availability

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NSN 5310-00-159-1577 Datasheet

Supply Class (FSC):
Nuts And Washers
Cross Reference:
  • MS51988-3
  • MIL-N-45913
  • MS51988-3
  • MS51988-3
Cage Codes:
  • Military Standards (CAGE 96906)
  • Federal Specifications (CAGE 81348)
  • Oshkosh Defense, Llc (CAGE 75Q65)
  • Oshkosh Corporation (CAGE 45152)
  • 5310-00-159-1577 replaces 5310-01-237-2011
Schedule B & Trade:
  • Schedule B: 8710000090 (NAICS 336992)

    Parts of armored fighting vehicles, motorized, whether or not fitted with weapons

  • SITC: 89111

    Tanks and other armored fighting vehicles, motorized, whether or not fitted with weapons, and parts of such vehicles

  • End Use: 50030

    Military trucks, armored vehicles, etc.


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:

    093486 - Bolts, nuts or screws, noi (sub 3)

  • WCC:

    573 - Bolts or nuts (iron or steel),(less than 35 feet)

  • 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:

    W - Rating variable

  • 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 $0.36 to $0.61..
Does NSN 5310-00-159-1577 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 Army, Department Of The Air Force, U.s. Marine Corps, Department Of The Navy, Spain, Columbia, Australia, Canada, Germany, Republic Of Korea, United Kingdom, Netherlands, Portugal, and Greece
What is the NIIN of NSN 5310-00-159-1577?
001591577 or 00-159-1577
Does NSN 5310-00-159-1577 require demilitarization?
Yes - ITAR Controlled
What is the most recent solicitation for NSN 5310-00-159-1577?
No solicitations for this NSN.
When was this national stock number assigned to the federal catalog?
Oct 24, 1971