PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

21508Spacer,sleeve

Eaton Aerospace Llc · NSN 5365-00-168-6671 · FSC 5365 · No Item Name Available
Verified by PartsTable
NSN 5365-00-168-6671 — this item is cataloged by the U.S. Government under National Stock Number 5365-00-168-6671. Primary manufacturer part number: 21508.
Features
  • Spacer,sleeve — FSC 5365
  • Style Designator: SOLID, EXTERNAL FLANGES BOTH ENDS
  • Material: STEEL CORROSION RESISTING OVERALL
  • Corner Shape: SQUARE ALL CORNERS
  • Body Outside Diameter: 0.2500 INCHES NOMINAL IN
  • Flange Width: 0.0280 INCHES MINIMUM AND 0.0320 INCHES MAXIMUM IN
  • Left Flange Outside Diameter: 0.3740 INCHES MINIMUM AND 0.3745 INCHES MAXIMUM IN
  • Right Flange Outside Diameter: 0.3740 INCHES MINIMUM AND 0.3745 INCHES MAXIMUM IN
Applications
  • Applications requiring Steel Corrosion Resisting Overall construction
General Description

The Spacer,sleeve, cataloged under National Stock Number 5365-00-168-6671, is classified within Federal Supply Class 5365 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Eaton Aerospace Llc. Government technical data includes 8 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. 3 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5365-00-168-6671
Primary Part Number21508
Item NameSpacer,sleeve
FSC / FSG5365 / 53 — No Item Name Available
ManufacturerEaton Aerospace Llc
StatusACTIVE
Style DesignatorSOLID, EXTERNAL FLANGES BOTH ENDS
MaterialSTEEL CORROSION RESISTING OVERALL
Corner ShapeSQUARE ALL CORNERS
Body Outside Diameter0.2500 INCHES NOMINAL IN
Flange Width0.0280 INCHES MINIMUM AND 0.0320 INCHES MAXIMUM IN
Left Flange Outside Diameter0.3740 INCHES MINIMUM AND 0.3745 INCHES MAXIMUM IN
Right Flange Outside Diameter0.3740 INCHES MINIMUM AND 0.3745 INCHES MAXIMUM IN
Body Inside Diameter0.1870 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 3
2040-00-506-09732409-3227846REVAPC21 INTERCHANGEABLE
Line Assy
Naval Ship Systems Command
2990-01-027-221421508 INTERCHANGEABLE
Muffler,exhaust
Walker Mfg Co
6550-01-379-9246R21508 INTERCHANGEABLE
Desoxycholate Test Reagent
Remel Inc.
Cross-Reference Index
Part NumberManufacturer
21508 PRIMARY Eaton Aerospace Llc (USA)
Related Parts
2040-00-506-0973INTERCHANGEABLE
LINE ASSY
2409-3227846REVAPC21
2990-01-027-2214INTERCHANGEABLE
MUFFLER,EXHAUST
21508
6550-01-379-9246INTERCHANGEABLE
DESOXYCHOLATE TEST REAGENT
R21508

Frequently Asked Questions

What is NSN 5365-00-168-6671?

NSN 5365-00-168-6671 is a Spacer,sleeve, manufactured by Eaton Aerospace Llc, classified under FSC 5365 (No Item Name Available). Status: active.

What are the part numbers for NSN 5365-00-168-6671?

NSN 5365-00-168-6671 has 1 cross-referenced part number: 21508 (Eaton Aerospace Llc).

What NSN replaces 5365-00-168-6671?

There are 3 known substitutes for 5365-00-168-6671: 2040-00-506-0973, 2990-01-027-2214, 6550-01-379-9246. Verify interchangeability with system specifications before substitution.

What are the specifications of 21508?

Key specifications for 21508: Style Designator: SOLID, EXTERNAL FLANGES BOTH ENDS; Material: STEEL CORROSION RESISTING OVERALL; Corner Shape: SQUARE ALL CORNERS; Body Outside Diameter: 0.2500 INCHES NOMINAL IN. 9 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com