PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

MILW21338Washer,key

Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M · NSN 5310-00-177-7684 · FSC 5310 · No Item Name Available
Verified by PartsTable
NSN 5310-00-177-7684 — this item is cataloged by the U.S. Government under National Stock Number 5310-00-177-7684. Primary manufacturer part number: MILW21338.
Features
  • Washer,key — FSC 5310
  • Internal Prebent Key Length: 0.094 INCHES MINIMUM AND 0.125 INCHES MAXIMUM IN
  • Material: STEEL COMP 1010 OR STEEL COMP 1011 OR STEEL COMP 1012 OR STEEL COMP 1013 OR STEEL COMP 1015 OR STEEL COMP 1016 OR STEEL COMP 1017 OR STEEL COMP 1018 OR STEEL COMP 1019 OR STEEL COMP 1020 OR STEEL COMP 1021 OR STEEL COMP 1022 OR STEEL COMP 1026 OR STEEL COMP 1030 OR STEEL COMP 1034 OR STEEL COMP 1035 OVERALL
  • External Prebent Key Width: 0.146 INCHES MINIMUM AND 0.166 INCHES MAXIMUM IN
  • Outside Diameter: 1.812 INCHES MINIMUM AND 1.827 INCHES MAXIMUM IN
  • Hole Diameter: 1.333 INCHES MINIMUM AND 1.353 INCHES MAXIMUM IN
  • Overall Distance Including Keys: 2.250 INCHES MAXIMUM IN
  • Nondefinitive Spec/std Data: 1 TYPE AND 2 CLASS AND 3 CLASS
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Steel Comp 1010 or Steel Comp 1011 or Steel Comp 1012 or Steel Comp 1013 or Steel Comp 1015 or Steel Comp 1016 or Steel Comp 1017 or Steel Comp 1018 or Steel Comp 1019 or Steel Comp 1020 or Steel Comp 1021 or Steel Comp 1022 or Steel Comp 1026 or Steel Comp 1030 or Steel Comp 1034 or Steel Comp 1035 Overall construction
General Description

The Washer,key, cataloged under National Stock Number 5310-00-177-7684, is classified within Federal Supply Class 5310 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M. Government technical data includes 12 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 4 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5310-00-177-7684
Primary Part NumberMILW21338
Item NameWasher,key
FSC / FSG5310 / 53 — No Item Name Available
ManufacturerMilitary Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
StatusACTIVE
Internal Prebent Key Length0.094 INCHES MINIMUM AND 0.125 INCHES MAXIMUM IN
MaterialSTEEL COMP 1010 OR STEEL COMP 1011 OR STEEL COMP 1012 OR STEEL COMP 1013 OR STEEL COMP 1015 OR STEEL COMP 1016 OR STEEL COMP 1017 OR STEEL COMP 1018 OR STEEL COMP 1019 OR STEEL COMP 1020 OR STEEL COMP 1021 OR STEEL COMP 1022 OR STEEL COMP 1026 OR STEEL COMP 1030 OR STEEL COMP 1034 OR STEEL COMP 1035 OVERALL
External Prebent Key Width0.146 INCHES MINIMUM AND 0.166 INCHES MAXIMUM IN
Outside Diameter1.812 INCHES MINIMUM AND 1.827 INCHES MAXIMUM IN
Hole Diameter1.333 INCHES MINIMUM AND 1.353 INCHES MAXIMUM IN
Overall Distance Including Keys2.250 INCHES MAXIMUM IN
Nondefinitive Spec/std Data1 TYPE AND 2 CLASS AND 3 CLASS
Material Document and Classification66 FED STD ALL MATERIAL RESPONSES OVERALL
Internal Prebent Key Width0.156 INCHES MINIMUM AND 0.176 INCHES MAXIMUM IN
Material Thickness0.046 INCHES MINIMUM AND 0.054 INCHES MAXIMUM IN
Style DesignatorKEY
External Key Quantity15
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5310-00-008-5904 INTERCHANGEABLE
Washer,key
5310-00-150-3963 INTERCHANGEABLE
Washer,key
5310-00-151-5545 INTERCHANGEABLE
Washer,key
5310-00-159-6282 INTERCHANGEABLE
Washer,key
5310-00-159-6283 INTERCHANGEABLE
Washer,key
5310-00-159-6495 INTERCHANGEABLE
Washer,key
5310-00-165-8392 INTERCHANGEABLE
Washer,key
5310-00-186-0966 INTERCHANGEABLE
Washer,key
5310-00-186-0980 INTERCHANGEABLE
Washer,key
5310-00-186-099912Z10002-8 INTERCHANGEABLE
Washer,key
Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier
Cross-Reference Index
Part NumberManufacturer
MILW21338 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
MS19070-0651 Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M
5310001777684 E.c.a Etablissement Central Des Approvisionnements Des Forces Armees Royales
5310001777684 E.c.a Etablissement Centrald'approvisionnement Des Forces Armee
Related Parts
5310-00-008-5904INTERCHANGEABLE
WASHER,KEY
5310-00-150-3963INTERCHANGEABLE
WASHER,KEY
5310-00-151-5545INTERCHANGEABLE
WASHER,KEY
5310-00-159-6282INTERCHANGEABLE
WASHER,KEY
5310-00-159-6283INTERCHANGEABLE
WASHER,KEY
5310-00-159-6495INTERCHANGEABLE
WASHER,KEY
5310-00-165-8392INTERCHANGEABLE
WASHER,KEY
5310-00-186-0966INTERCHANGEABLE
WASHER,KEY
5310-00-186-0980INTERCHANGEABLE
WASHER,KEY
5310-00-186-0999INTERCHANGEABLE
WASHER,KEY
12Z10002-8
5310-00-186-1071INTERCHANGEABLE
WASHER,KEY
5310-00-186-1092INTERCHANGEABLE
WASHER,KEY
888737-62

Frequently Asked Questions

What is NSN 5310-00-177-7684?

NSN 5310-00-177-7684 is a Washer,key, manufactured by Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M, classified under FSC 5310 (No Item Name Available). Status: active.

What are the part numbers for NSN 5310-00-177-7684?

NSN 5310-00-177-7684 has 4 cross-referenced part numbers: MILW21338 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), MS19070-0651 (Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M), 5310001777684 (E.c.a Etablissement Central Des Approvisionnements Des Forces Armees Royales), 5310001777684 (E.c.a Etablissement Centrald'approvisionnement Des Forces Armee).

What NSN replaces 5310-00-177-7684?

There are 12 known substitutes for 5310-00-177-7684: 5310-00-008-5904, 5310-00-150-3963, 5310-00-151-5545 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of MILW21338?

Key specifications for MILW21338: Internal Prebent Key Length: 0.094 INCHES MINIMUM AND 0.125 INCHES MAXIMUM IN; Material: STEEL COMP 1010 OR STEEL COMP 1011 OR STEEL COMP 1012 OR STEEL COMP 1013 OR STEEL COMP 1015 OR STEEL COMP 1016 OR STEEL COMP 1017 OR STEEL COMP 1018 OR STEEL COMP 1019 OR STEEL COMP 1020 OR STEEL COMP 1021 OR STEEL COMP 1022 OR STEEL COMP 1026 OR STEEL COMP 1030 OR STEEL COMP 1034 OR STEEL COMP 1035 OVERALL; External Prebent Key Width: 0.146 INCHES MINIMUM AND 0.166 INCHES MAXIMUM IN; Outside Diameter: 1.812 INCHES MINIMUM AND 1.827 INCHES MAXIMUM IN. 12 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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