The Bearing, cataloged under National Stock Number 3110-01-021-3550, is classified within Federal Supply Class 3110 (Bearings, Antifriction, Unmounted) of the Bearings group. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
Catalog Facts
Item Name
Bearing
FSC / FSG
3110 — Bearings, Antifriction, Unmounted (FSG 31)
Technical Specifications
Parameter
Value
NSN
3110-01-021-3550
Item Name
Bearing
FSC / FSG
3110 / 31 — Bearings, Antifriction, Unmounted
Status
ACTIVE
Lifecycle & Compliance
Acquisition Status
ACTIVE
DEMIL Code
DEMIL A — No Demilitarization Required
Hazard
No hazard code in the DLA record (HMIC N)
⇄Related Items5
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
4820-01-063-6617POSSIBLE MATCH
VALVE,LINEAR,DIRECTIONAL CONTROL
Possible match (shared part number)
5340-01-064-1961631B20-1POSSIBLE MATCH
RETAINER,HELICAL COMPRESSION SPR
Possible match (shared part number)Sargent Aerospace & Defense, Llc Dba Sargent Controls & Aerospace Div Sargent Controls & Aerospace
4820-01-064-600520400-1050POSSIBLE MATCH
GUIDE,SPRING
Possible match (shared part number)Sargent Aerospace & Defense, Llc Dba Sargent Controls & Aerospace Div Sargent Controls & Aerospace
4820-01-105-254220400-400POSSIBLE MATCH
BODY,VALVE
Possible match (shared part number)Sargent Aerospace & Defense, Llc Dba Sargent Controls & Aerospace Div Sargent Controls & Aerospace
5342-01-105-753320400-1154POSSIBLE MATCH
BRACKET,VALVE
Possible match (shared part number)Sargent Aerospace & Defense, Llc Dba Sargent Controls & Aerospace Div Sargent Controls & Aerospace
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
59769C91
3/9Design control — primary reference
International Harvester Co Agricultural Equipment Div
2040-2002
5/9Secondary reference
U.S. Government activity
59769C91
5/9Secondary reference
Navistar International Corporation Dba Navistar
527237R1
5/9Secondary reference
Navistar International Corporation Dba Navistar
527237R1
5/9Secondary reference
International Harvester Co Agricultural Equipment Div
Related Parts
4820-01-063-6617POSSIBLE MATCH
VALVE,LINEAR,DIRECTIONAL CONTROL
5340-01-064-1961POSSIBLE MATCH
RETAINER,HELICAL COMPRESSION SPR
631B20-1
4820-01-064-6005POSSIBLE MATCH
GUIDE,SPRING
20400-1050
4820-01-105-2542POSSIBLE MATCH
BODY,VALVE
20400-400
5342-01-105-7533POSSIBLE MATCH
BRACKET,VALVE
20400-1154
Frequently Asked Questions
What is NSN 3110-01-021-3550?
NSN 3110-01-021-3550 is a Bearing, classified under FSC 3110, Bearings, Antifriction, Unmounted. Status: active.
What NSN replaces 3110-01-021-3550?
5 possible matches (shared part number, not a government interchangeability claim): 4820-01-063-6617, 5340-01-064-1961, 4820-01-064-6005. Verify interchangeability with system specifications before substitution.
Is NSN 3110-01-021-3550 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.