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Hexagon Extended Washer Self-locking Nut

NSN: 5310-00-930-8214 | Model: MS51988-7

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
Between 0.728 inches and 0.750 inches
Dry film lubricant
Overall Height
0.385 inches
Nut Style
Washer Thickness
Between 0.050 inches and 0.070 inches
Width Across Flats
Between 0.5510 inches and 0.5645 inches
Thread Series
Thready Qty Per Inch (tpi)
Thread Size
0.375 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: 740
  • New: 703

Pricing and Availability

Send us a request for quote using the form below. Our team will contact you with an up to date pricing and availability quote ASAP.

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NSN 5310-00-930-8214 Datasheet

Supply Class (FSC):
Nuts And Washers
Cross Reference:
  • MS51988-7
  • 192077
  • 3KK205
  • 5310009308214
  • 192077
  • 12339502
  • 5584334
  • 89325
  • 3KK205
Cage Codes:
  • Military Standards (CAGE 96906)
  • Yale Group, Inc. Hyster (CAGE 04627)
  • Oshkosh Corporation (CAGE 45152)
  • E.c.a Etablissement (CAGE SCY13)
  • Yale Group, Inc. Hyster (CAGE 30076)
  • Am General Llc (CAGE 34623)
  • Hayes Wheels Intl Inc (CAGE 41885)
  • Oshkosh Defense, Llc (CAGE 75Q65)
  • 5310-00-930-8214 replaces 5310-01-017-3843
  • 5310-00-930-8214 replaces 5310-01-075-8543
  • 5310-00-930-8214 replaces 5310-01-212-2215
  • 5310-00-930-8214 replaces 5310-01-265-8968
Schedule B & Trade:
  • Schedule B: 7318160000 (NAICS 332722)

    Nuts of iron or steel

  • SITC: 69421

    Screws, bolts, nuts, screw hooks, rivets, washers and similar articles, threaded, of iron or steel

  • End Use: 12300

    Finished metal shapes


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


A - Item does not contain precious metal.


- Represents items with no adp components


- 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 $0.57 to $0.95..
Does NSN 5310-00-930-8214 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, Austria, Brazil, Spain, Singapore, Kuwait, Morocco, Malaysia, Canada, Republic Of Korea, Portugal, Greece, and Turkey
What is the NIIN of NSN 5310-00-930-8214?
009308214 or 00-930-8214
Does NSN 5310-00-930-8214 require demilitarization?
Yes - ITAR Controlled
What is the most recent solicitation for NSN 5310-00-930-8214?
No solicitations for this NSN.
When was this national stock number assigned to the federal catalog?
Jul 06, 1966