PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

55366Nut,plain,hexagon

Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Multiple · NSN 5310-00-685-2406 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-00-685-2406 — this item is cataloged by the U.S. Government under National Stock Number 5310-00-685-2406. Primary manufacturer part number: 55366.
Features
  • Nut,plain,hexagon — FSC 5310
  • Material: STEEL OVERALL
  • Nut Height: 0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
  • Thread Series: UN
  • Thread Quantity Per Inch: 40
  • Bearing Surface Type: CHAMFERED OR WASHER FACED
  • Nominal Thread Size: 0.4375 INCHES IN
  • Hole Configuration Style: CONFIGURATION B
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Steel Overall construction
General Description

The Nut,plain,hexagon, cataloged under National Stock Number 5310-00-685-2406, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Multiple. Government technical data includes 15 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 5 commercial cross-references from 5 manufacturers, enabling identification through both NSN and commercial part number lookups. 5 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5310-00-685-2406
Primary Part Number55366
Item NameNut,plain,hexagon
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerNorthrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Multiple
StatusCANCELLED
MaterialSTEEL OVERALL
Nut Height0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN
Thread SeriesUN
Thread Quantity Per Inch40
Bearing Surface TypeCHAMFERED OR WASHER FACED
Nominal Thread Size0.4375 INCHES IN
Hole Configuration StyleCONFIGURATION B
Bearing Surface Finish125.0 MICROINCHES
Width Across Flats0.688 INCHES NOMINAL IN
Drilled Hole Diameter0.040 INCHES NOMINAL IN
Thread Pitch Diameters+0.4213 TO 0.4248 INCHES IN
Surface TreatmentCADMIUM OVERALL
Thread DirectionRIGHT-HAND
Nut StyleHEXAGON
Hole Type and Quantity3 DRILLED
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 5
5310-00-080-9253ASTM B121/B121M UNS-C33500 ANNEA INTERCHANGEABLE
Washer,flat
American Society for Testing and Materials Dba Astm International
9510-00-596-3933 INTERCHANGEABLE
Bar,metal
1650-00-887-682755366 INTERCHANGEABLE
Cap,valve
Woodward Hrt Inc
5935-01-092-9402429282 INTERCHANGEABLE
Socket,plug-in Electronic Compon
Fluke Corp
6680-01-671-45495536-6 INTERCHANGEABLE
Gage Rod-Cap,liquid Level
Wisco Products Inc
Cross-Reference Index
Part NumberManufacturer
55366 Northrop Grumman Systems Corporation Div Es Defensive Systems Division (USA)
55366 PRIMARY Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Multiple (USA)
MIL-S-5626C Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
SAE-AMS-QQ-P-416A TY 2 CL 2 Society of Automotive Engineers Inc (USA)
SAE-AMS-QQ-P-416A TY 2 CL 2 Sae International Dba Sae International (USA)
Related Parts
5310-00-080-9253INTERCHANGEABLE
WASHER,FLAT
ASTM B121/B121M UNS-C33500 ANNEA
9510-00-596-3933INTERCHANGEABLE
BAR,METAL
1650-00-887-6827INTERCHANGEABLE
CAP,VALVE
55366
5935-01-092-9402INTERCHANGEABLE
SOCKET,PLUG-IN ELECTRONIC COMPON
429282
6680-01-671-4549INTERCHANGEABLE
GAGE ROD-CAP,LIQUID LEVEL
5536-6

Frequently Asked Questions

What is NSN 5310-00-685-2406?

NSN 5310-00-685-2406 is a Nut,plain,hexagon, manufactured by Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Multiple, classified under FSC 5310 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5310-00-685-2406?

NSN 5310-00-685-2406 has 5 cross-referenced part numbers: 55366 (Northrop Grumman Systems Corporation Div Es Defensive Systems Division), 55366 (Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Multiple), MIL-S-5626C (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), SAE-AMS-QQ-P-416A TY 2 CL 2 (Society of Automotive Engineers Inc), SAE-AMS-QQ-P-416A TY 2 CL 2 (Sae International Dba Sae International).

What NSN replaces 5310-00-685-2406?

There are 5 known substitutes for 5310-00-685-2406: 5310-00-080-9253, 9510-00-596-3933, 1650-00-887-6827 and 2 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 55366?

Key specifications for 55366: Material: STEEL OVERALL; Nut Height: 0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN; Thread Series: UN; Thread Quantity Per Inch: 40. 15 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5310-00-685-2406 still in active supply?

NSN 5310-00-685-2406 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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