PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

MS21258C39Washer,key

National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use · NSN 5310-00-877-9576 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-00-877-9576 — this item is cataloged by the U.S. Government under National Stock Number 5310-00-877-9576. Primary manufacturer part number: MS21258C39.
Features
  • Washer,key — FSC 5310
  • Hole Diameter: 2.445 INCHES MINIMUM AND 2.455 INCHES MAXIMUM IN
  • Material: STEEL COMP 1018 OR STEEL COMP 1020 OR STEEL COMP 1025 OVERALL
  • Surface Treatment: CADMIUM AND CHROMATE OVERALL
  • Style Designator: KEY
  • Internal Straight Key Width: 0.209 INCHES MINIMUM AND 0.229 INCHES MAXIMUM IN
  • Surface Treatment Document and Classification: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
  • Material Document and Classification: ASTM A108 ASSN STD ALL MATERIAL RESPONSES OVERALL
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Steel Comp 1018 or Steel Comp 1020 or Steel Comp 1025 Overall construction
General Description

The Washer,key, cataloged under National Stock Number 5310-00-877-9576, 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 11 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 7 commercial cross-references from 6 manufacturers, enabling identification through both NSN and commercial part number lookups. 3 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5310-00-877-9576
Primary Part NumberMS21258C39
Item NameWasher,key
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerNational Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use
StatusCANCELLED
Hole Diameter2.445 INCHES MINIMUM AND 2.455 INCHES MAXIMUM IN
MaterialSTEEL COMP 1018 OR STEEL COMP 1020 OR STEEL COMP 1025 OVERALL
Surface TreatmentCADMIUM AND CHROMATE OVERALL
Style DesignatorKEY
Internal Straight Key Width0.209 INCHES MINIMUM AND 0.229 INCHES MAXIMUM IN
Surface Treatment Document and ClassificationQQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
Material Document and ClassificationASTM A108 ASSN STD ALL MATERIAL RESPONSES OVERALL
Material Thickness0.120 INCHES MINIMUM AND 0.130 INCHES MAXIMUM IN
Internal Key Quantity1
Distance From Centerline to Top of Internal Key1.100 INCHES MINIMUM AND 1.110 INCHES MAXIMUM IN
Outside Diameter3.032 INCHES MINIMUM AND 3.092 INCHES MAXIMUM IN
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 3
5305-00-206-2862 INTERCHANGEABLE
Setscrew
6625-01-110-5813125-8 INTERCHANGEABLE
Holder
Dwyer Instruments Inc
5999-01-173-5616 INTERCHANGEABLE
Magnet,permanent
Cross-Reference Index
Part NumberManufacturer
AN7503-39 Aeronautical Standards Group Dept of Navy and Air Force (USA)
5310PL1023244 Jednolity Indeks Materialowy - Uniform Material Index (POL)
MS21258C39 PRIMARY National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use (USA)
AC32A509-3 Safety for Visual Education (USA)
MS21258C39 Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M
AC34433 Safety for Visual Education (USA)
A35-7 PRIMARY Goodrich Corporation (USA)
Related Parts
5305-00-206-2862INTERCHANGEABLE
SETSCREW
6625-01-110-5813INTERCHANGEABLE
HOLDER
125-8
5999-01-173-5616INTERCHANGEABLE
MAGNET,PERMANENT

Frequently Asked Questions

What is NSN 5310-00-877-9576?

NSN 5310-00-877-9576 is a Washer,key, 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: cancelled.

What are the part numbers for NSN 5310-00-877-9576?

NSN 5310-00-877-9576 has 7 cross-referenced part numbers: AN7503-39 (Aeronautical Standards Group Dept of Navy and Air Force), 5310PL1023244 (Jednolity Indeks Materialowy - Uniform Material Index), MS21258C39 (National Aerospace Standards Committee Aerospace Industries Association of America Inc Not for Rfq or Solicitation Use), AC32A509-3 (Safety for Visual Education), MS21258C39 (Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M) and 2 more.

What NSN replaces 5310-00-877-9576?

There are 3 known substitutes for 5310-00-877-9576: 5305-00-206-2862, 6625-01-110-5813, 5999-01-173-5616. Verify interchangeability with system specifications before substitution.

What are the specifications of MS21258C39?

Key specifications for MS21258C39: Hole Diameter: 2.445 INCHES MINIMUM AND 2.455 INCHES MAXIMUM IN; Material: STEEL COMP 1018 OR STEEL COMP 1020 OR STEEL COMP 1025 OVERALL; Surface Treatment: CADMIUM AND CHROMATE OVERALL; Style Designator: KEY. 11 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5310-00-877-9576 still in active supply?

NSN 5310-00-877-9576 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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