PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

MS21244-5Nut,plain,assembled Washer

National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use · NSN 5310-00-126-5754 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-00-126-5754 — this item is cataloged by the U.S. Government under National Stock Number 5310-00-126-5754. Primary manufacturer part number: MS21244-5.
Features
  • Nut,plain,assembled Washer — FSC 5310
  • Thread Class: 3B
  • Thread Series: UNIFIED NATIONAL JOINT FINE (UNJF)
  • Nondefinitive Spec/std Data: A GRADE
  • Counterbore Diameter: 0.385 INCHES MINIMUM AND 0.395 INCHES MAXIMUM NUT IN
  • Surface Treatment Document and Classification: QQ-P-416 TYPE 2 CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE NUT
  • Material: STEEL COMP 302 OR STEEL COMP 321 WASHER
  • Nominal Thread Size: 0.312 INCHES IN
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Steel Comp 302 or Steel Comp 321 Washer construction
General Description

The Nut,plain,assembled Washer, cataloged under National Stock Number 5310-00-126-5754, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use. Government technical data includes 19 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 6 commercial cross-references from 6 manufacturers, enabling identification through both NSN and commercial part number lookups. 4 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5310-00-126-5754
Primary Part NumberMS21244-5
Item NameNut,plain,assembled Washer
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerNational Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
StatusACTIVE
Thread Class3B
Thread SeriesUNIFIED NATIONAL JOINT FINE (UNJF)
Nondefinitive Spec/std DataA GRADE
Counterbore Diameter0.385 INCHES MINIMUM AND 0.395 INCHES MAXIMUM NUT IN
Surface Treatment Document and ClassificationQQ-P-416 TYPE 2 CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE NUT
MaterialSTEEL COMP 302 OR STEEL COMP 321 WASHER
Nominal Thread Size0.312 INCHES IN
Nut StyleFLAT WITH TURNED BACK EDGE
Bearing Surface Finish125.0 MICROINCHES
Surface TreatmentPASSIVATE WASHER
Surface Treatment Document and ClassificationQQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE WASHER
Surface TreatmentCADMIUM AND CHROMATE NUT
Width Across Flats0.492 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN
Temp Rating450.0 FAHRENHEIT MAXIMUM DEGF
Washer Outside Diameter0.610 INCHES MINIMUM AND 0.640 INCHES MAXIMUM IN
Thread DirectionRIGHT-HAND
MaterialSTEEL NUT
Nut Counterbore Depth0.203 INCHES MINIMUM AND 0.223 INCHES MAXIMUM NUT IN
Thread Quantity Per Inch24
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 4
4320-00-001-6206 INTERCHANGEABLE
Pump,rotary
3110-00-100-05892606249 INTERCHANGEABLE
Cup,tapered Roller Bearing
The Boeing Company Div Defense
7510-01-452-052697705 INTERCHANGEABLE
Rubber Band
Alliance Rubber Co
6145-01-517-371497705 INTERCHANGEABLE
Cable,power,electrical
Heil Trailer International Llc
Cross-Reference Index
Part NumberManufacturer
10116564 Nimikkeistokeskus Ncb Finland (FIN)
9770-5 Harvard Industries Inc (USA)
9770-5 Esna, Llc (USA)
MS21244-5 PRIMARY National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use (USA)
MS21244-5 Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M
FF-N-836 Federal Specifications Promulgated by General Services Administration Washington DC (USA)
Related Parts
4320-00-001-6206INTERCHANGEABLE
PUMP,ROTARY
3110-00-100-0589INTERCHANGEABLE
CUP,TAPERED ROLLER BEARING
2606249
7510-01-452-0526INTERCHANGEABLE
RUBBER BAND
97705
6145-01-517-3714INTERCHANGEABLE
CABLE,POWER,ELECTRICAL
97705

Frequently Asked Questions

What is NSN 5310-00-126-5754?

NSN 5310-00-126-5754 is a Nut,plain,assembled Washer, manufactured by National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use, classified under FSC 5310 (No Item Name Available). Status: active.

What are the part numbers for NSN 5310-00-126-5754?

NSN 5310-00-126-5754 has 6 cross-referenced part numbers: 10116564 (Nimikkeistokeskus Ncb Finland), 9770-5 (Harvard Industries Inc), 9770-5 (Esna, Llc), MS21244-5 (National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use), MS21244-5 (Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M) and 1 more.

What NSN replaces 5310-00-126-5754?

There are 4 known substitutes for 5310-00-126-5754: 4320-00-001-6206, 3110-00-100-0589, 7510-01-452-0526 and 1 more. Verify interchangeability with system specifications before substitution.

What are the specifications of MS21244-5?

Key specifications for MS21244-5: Thread Class: 3B; Thread Series: UNIFIED NATIONAL JOINT FINE (UNJF); Nondefinitive Spec/std Data: A GRADE; Counterbore Diameter: 0.385 INCHES MINIMUM AND 0.395 INCHES MAXIMUM NUT IN. 20 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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