PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

268-3Nut,plain,castellated,hexagon

American Coleman Company, the Dba Metro Crown International · NSN 5310-00-550-1364 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-00-550-1364 — this item is cataloged by the U.S. Government under National Stock Number 5310-00-550-1364. Primary manufacturer part number: 268-3.
Features
  • Nut,plain,castellated,hexagon — FSC 5310
  • Material Document and Classification: SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
  • Thread Class: 2B
  • Thread Quantity Per Inch: 12
  • Width Across Flats: 2.188 INCHES MINIMUM AND 2.312 INCHES MAXIMUM IN
  • Nut Height: 1.438 INCHES MINIMUM AND 1.562 INCHES MAXIMUM IN
  • Nut Style: CASTELLATED, HEXAGON
  • Thread Direction: RIGHT-HAND
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Steel Comp 1010 Overall construction
General Description

The Nut,plain,castellated,hexagon, cataloged under National Stock Number 5310-00-550-1364, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is American Coleman Company, the Dba Metro Crown International. Government technical data includes 11 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 10 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5310-00-550-1364
Primary Part Number268-3
Item NameNut,plain,castellated,hexagon
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerAmerican Coleman Company, the Dba Metro Crown International
StatusACTIVE
Material Document and ClassificationSAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL
Thread Class2B
Thread Quantity Per Inch12
Width Across Flats2.188 INCHES MINIMUM AND 2.312 INCHES MAXIMUM IN
Nut Height1.438 INCHES MINIMUM AND 1.562 INCHES MAXIMUM IN
Nut StyleCASTELLATED, HEXAGON
Thread DirectionRIGHT-HAND
Thread SeriesUNF
MaterialSTEEL COMP 1010 OVERALL
Bearing Surface TypeFLAT
Nominal Thread Size1.500 INCHES IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 10
4820-00-176-46212683 INTERCHANGEABLE
Valve,safety Relief
Tactair Fluid Controls Inc
3020-00-214-3186 INTERCHANGEABLE
Gear,drive Motion
5305-00-486-16332683 INTERCHANGEABLE
Setscrew
Triumph Engine Control Systems Llc
5935-00-824-7588ADT-2683-NF-SMF-02 INTERCHANGEABLE
Adapter,connector
Cinch Connectivity Solutions Inc
2940-01-010-894442683 INTERCHANGEABLE
Filter Element,intake Air Cleane
Wix Corp
5998-01-029-98331203513-4 INTERCHANGEABLE
Circuit Card Assembly
Lockheed Martin Corporation Div Rms - Mitchel Field
5430-01-074-81092683 INTERCHANGEABLE
Tank,liquid Storage
Mag Aerospace Industries, Llc Div Safran Cabins
5310-01-140-78372683 INTERCHANGEABLE
Washer,shouldered
Dialight Corporation
5340-01-203-19802683 INTERCHANGEABLE
Cap-Plug,protective,dust and Moi
Heyco Inc Dba Heyco Products
1005-01-546-39022683 INTERCHANGEABLE
Pad,recoil
U.s. Ordnance
Cross-Reference Index
Part NumberManufacturer
268-3 American Coleman Company, the Dba Metro Crown International (USA)
Related Parts
4820-00-176-4621INTERCHANGEABLE
VALVE,SAFETY RELIEF
2683
3020-00-214-3186INTERCHANGEABLE
GEAR,DRIVE MOTION
5305-00-486-1633INTERCHANGEABLE
SETSCREW
2683
5935-00-824-7588INTERCHANGEABLE
ADAPTER,CONNECTOR
ADT-2683-NF-SMF-02
2940-01-010-8944INTERCHANGEABLE
FILTER ELEMENT,INTAKE AIR CLEANE
42683
5998-01-029-9833INTERCHANGEABLE
CIRCUIT CARD ASSEMBLY
1203513-4
5430-01-074-8109INTERCHANGEABLE
TANK,LIQUID STORAGE
2683
5310-01-140-7837INTERCHANGEABLE
WASHER,SHOULDERED
2683
5340-01-203-1980INTERCHANGEABLE
CAP-PLUG,PROTECTIVE,DUST AND MOI
2683
1005-01-546-3902INTERCHANGEABLE
PAD,RECOIL
2683

Frequently Asked Questions

What is NSN 5310-00-550-1364?

NSN 5310-00-550-1364 is a Nut,plain,castellated,hexagon, manufactured by American Coleman Company, the Dba Metro Crown International, classified under FSC 5310 (No Item Name Available). Status: active.

What are the part numbers for NSN 5310-00-550-1364?

NSN 5310-00-550-1364 has 1 cross-referenced part number: 268-3 (American Coleman Company, the Dba Metro Crown International).

What NSN replaces 5310-00-550-1364?

There are 10 known substitutes for 5310-00-550-1364: 4820-00-176-4621, 3020-00-214-3186, 5305-00-486-1633 and 7 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 268-3?

Key specifications for 268-3: Material Document and Classification: SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Thread Class: 2B; Thread Quantity Per Inch: 12; Width Across Flats: 2.188 INCHES MINIMUM AND 2.312 INCHES MAXIMUM IN. 11 total characteristics are documented in the Federal Logistics Information System.

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