PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

51221Spacer,ring

Waterous Company · NSN 5365-01-097-9259 · FSC 5365 · No Item Name Available
Verified by PartsTable
NSN 5365-01-097-9259 — this item is cataloged by the U.S. Government under National Stock Number 5365-01-097-9259. Primary manufacturer part number: 51221.
Features
  • Spacer,ring — FSC 5365
  • Material: STEEL
  • Inside Diameter: 1.385 INCHES MINIMUM AND 1.395 INCHES MAXIMUM IN
  • Overall Thickness: 0.370 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
  • Outside Diameter: 1.750 INCHES NOMINAL IN
  • 1 verified cross-reference
  • Primary manufacturer: Waterous Company
Applications
  • Applications requiring Steel construction
General Description

The Spacer,ring, cataloged under National Stock Number 5365-01-097-9259, is classified within Federal Supply Class 5365 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Waterous Company. Government technical data includes 4 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. 5 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5365-01-097-9259
Primary Part Number51221
Item NameSpacer,ring
FSC / FSG5365 / 53 — No Item Name Available
ManufacturerWaterous Company
StatusACTIVE
MaterialSTEEL
Inside Diameter1.385 INCHES MINIMUM AND 1.395 INCHES MAXIMUM IN
Overall Thickness0.370 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
Outside Diameter1.750 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 5
5120-00-198-5400 INTERCHANGEABLE
Key,socket Head Screw
9540-00-804-939480025 INTERCHANGEABLE
Beam,structural
Aluminum Co of America
2915-00-953-861951221 INTERCHANGEABLE
Parts Kit,actuator,overhaul
Meggitt North Hollywood Inc
8030-01-373-73705122-1 INTERCHANGEABLE
Sealing Compound
L3harris Technologies, Inc. Div Space and Airborne Systems
4940-01-644-063651221 INTERCHANGEABLE
Cone Fill
Amerex Corporation Dba Getz Manufacturing Div Amerex Corporation Dba Getz Manufacturing
Cross-Reference Index
Part NumberManufacturer
51221 PRIMARY Waterous Company (USA)
Related Parts
5120-00-198-5400INTERCHANGEABLE
KEY,SOCKET HEAD SCREW
9540-00-804-9394INTERCHANGEABLE
BEAM,STRUCTURAL
80025
2915-00-953-8619INTERCHANGEABLE
PARTS KIT,ACTUATOR,OVERHAUL
51221
8030-01-373-7370INTERCHANGEABLE
SEALING COMPOUND
5122-1
4940-01-644-0636INTERCHANGEABLE
CONE FILL
51221

Frequently Asked Questions

What is NSN 5365-01-097-9259?

NSN 5365-01-097-9259 is a Spacer,ring, manufactured by Waterous Company, classified under FSC 5365 (No Item Name Available). Status: active.

What are the part numbers for NSN 5365-01-097-9259?

NSN 5365-01-097-9259 has 1 cross-referenced part number: 51221 (Waterous Company).

What NSN replaces 5365-01-097-9259?

There are 5 known substitutes for 5365-01-097-9259: 5120-00-198-5400, 9540-00-804-9394, 2915-00-953-8619 and 2 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 51221?

Key specifications for 51221: Material: STEEL; Inside Diameter: 1.385 INCHES MINIMUM AND 1.395 INCHES MAXIMUM IN; Overall Thickness: 0.370 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN; Outside Diameter: 1.750 INCHES NOMINAL IN. 4 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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