Major Thickness: 0.041 INCHES MINIMUM AND 0.045 INCHES MAXIMUM IN
Inside Diameter: 4.245 INCHES MINIMUM IN
Casehardening Indicator: NOT CASEHARDENED
Ring Style: SPECIAL
Identification
NSN: 5325-00-121-3544
NIIN: 001213544
FSC: 5325 — Fastening Devices
FSG: 53 — Hardware and Abrasives
General Description
The Ring,retaining, cataloged under National Stock Number 5325-00-121-3544, is classified within Federal Supply Class 5325 (Fastening Devices) of the Hardware and Abrasives group. Government technical data includes 9 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 6 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
Technical Specifications
Parameter
Value
NSN
5325-00-121-3544
Item Name
Ring,retaining
FSC / FSG
5325 / 53 — Fastening Devices
Status
ACTIVE
Usage Design
INTERNAL
Cross-Sectional Shape Style
RECTANGULAR
Outside Diameter
4.625 INCHES MINIMUM IN
Major Thickness
0.041 INCHES MINIMUM AND 0.045 INCHES MAXIMUM IN
Inside Diameter
4.245 INCHES MINIMUM IN
Casehardening Indicator
NOT CASEHARDENED
Ring Style
SPECIAL
Surface Treatment
CADMIUM
Material
STEEL
Lifecycle & Compliance
Acquisition Status
ACTIVE
DEMIL Code
DEMIL A — No Demilitarization Required
Hazard
No hazard code in the DLA record (HMIC N)
Criticality Code
X
⇄Related Items6
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
5999-00-204-8350POSSIBLE MATCH
CLIP,ELECTRICAL
Possible match (shared part number)
5962-01-250-0448POSSIBLE MATCH
MICROCIRCUIT,DIGITAL
Possible match (shared part number)
5962-01-287-7767POSSIBLE MATCH
MICROCIRCUIT,DIGITAL
Possible match (shared part number)
5962-01-398-1796POSSIBLE MATCH
MICROCIRCUIT,DIGITAL
Possible match (shared part number)
4810-01-420-342385517POSSIBLE MATCH
DISK,VALVE
Possible match (shared part number)Pti Technologies Inc.
1240-01-619-6719855-17POSSIBLE MATCH
HOLDER,OPTICAL ELEMENT
Possible match (shared part number)B.e. Meyers & Co., Inc. Dba Bemeyers Co
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
85-517
3/2Design control — primary reference
U.S. Government activity
Related Parts
5999-00-204-8350POSSIBLE MATCH
CLIP,ELECTRICAL
5962-01-250-0448POSSIBLE MATCH
MICROCIRCUIT,DIGITAL
5962-01-287-7767POSSIBLE MATCH
MICROCIRCUIT,DIGITAL
5962-01-398-1796POSSIBLE MATCH
MICROCIRCUIT,DIGITAL
4810-01-420-3423POSSIBLE MATCH
DISK,VALVE
85517
1240-01-619-6719POSSIBLE MATCH
HOLDER,OPTICAL ELEMENT
855-17
Frequently Asked Questions
What is NSN 5325-00-121-3544?
NSN 5325-00-121-3544 is a Ring,retaining, classified under FSC 5325, Fastening Devices. Status: active.
What NSN replaces 5325-00-121-3544?
6 possible matches (shared part number, not a government interchangeability claim): 5999-00-204-8350, 5962-01-250-0448, 5962-01-287-7767. Verify interchangeability with system specifications before substitution.
What are the specifications of 5325-00-121-3544?
Key specifications for 5325-00-121-3544: Usage Design: INTERNAL; Cross-Sectional Shape Style: RECTANGULAR; Outside Diameter: 4.625 INCHES MINIMUM IN; Major Thickness: 0.041 INCHES MINIMUM AND 0.045 INCHES MAXIMUM IN. 9 specifications are documented in the U.S. Government catalog.
Is NSN 5325-00-121-3544 hazardous material?
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
Sources
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.