NSN 4820-01-475-4033 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-475-4033. Manufacturer of record part number: 845-6655309 ITEM 6-1.
The Ball Guide, cataloged under National Stock Number 4820-01-475-4033, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Sea Systems Command. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 9 items share a part number with this NSN in the catalog (possible match — not a government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
4820-01-475-4033
Primary Part Number
845-6655309 ITEM 6-1
Item Name
Ball Guide
FSC / FSG
4820 / 48 — Valves, Nonpowered
Manufacturer
Naval Sea Systems Command
Status
ACTIVE
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 Items9
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
4820-01-475-4040845-6655309 ITEM 1-1POSSIBLE MATCH
SEAT GUIDE
Possible match (shared part number)Naval Sea Systems Command
5315-01-477-6788845-6655309 ITEM 2-2POSSIBLE MATCH
PIN,GROOVED,HEADED
Possible match (shared part number)Naval Sea Systems Command
5315-01-477-6791845-6655309 ITEM 3-2POSSIBLE MATCH
PIN,GROOVED,HEADED
Possible match (shared part number)Naval Sea Systems Command
5315-01-477-76742640-682-09 ITEM 20-2POSSIBLE MATCH
PIN,STRAIGHT,HEADED
Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat
5340-01-477-77692640-682-09 ITEM 16-1POSSIBLE MATCH
COVER,ACCESS
Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat
5340-01-477-9026845-6655309 ITEM 17-1POSSIBLE MATCH
COVER,ACCESS
Possible match (shared part number)Naval Sea Systems Command
4820-01-477-94472640-682-09 ITEM 9POSSIBLE MATCH
BALLADAPTER
Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat
5315-01-481-9572845-6655309 ITEM 21-5POSSIBLE MATCH
PIN,SPRING
Possible match (shared part number)Naval Sea Systems Command
4940-01-508-78082640-682-09 ITEM 11POSSIBLE MATCH
BALL ADAPTER
Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat
NSN 4820-01-475-4033 is a Ball Guide, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-01-475-4033?
NSN 4820-01-475-4033 has 1 manufacturer part number on file: 845-6655309 ITEM 6-1 (Naval Sea Systems Command).
What NSN replaces 4820-01-475-4033?
9 possible matches (shared part number, not a government interchangeability claim): 4820-01-475-4040, 5315-01-477-6788, 5315-01-477-6791. Verify interchangeability with system specifications before substitution.
What are the specifications of 845-6655309 ITEM 6-1?
Key specifications for 845-6655309 ITEM 6-1: End Item Identification: TOOL ASSEMBLY DIS ASSEMBLY TOP LOADED BALL VAIVH HIGY PRESSUR. 0 specifications are documented in the U.S. Government catalog.
Is NSN 4820-01-475-4033 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.