PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

845-2181282 PIECE 66 3INRetainer,seal,stem

Naval Sea Systems Command · NSN 4820-01-082-8833 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-082-8833 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-082-8833. Primary manufacturer part number: 845-2181282 PIECE 66 3IN.
Features
  • Retainer,seal,stem — FSC 4820
  • General Characteristics Item Description: TIN BRONZE PER QQ-C-390 SPEC; FOR 3 IN. VALVE IN
  • 4 verified cross-references
  • Primary manufacturer: Naval Sea Systems Command
Applications
  • Fluid containment and leak prevention
  • Pressure boundary maintenance
  • Environmental sealing
General Description

The Retainer,seal,stem, cataloged under National Stock Number 4820-01-082-8833, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Naval Sea Systems Command. Government technical data includes 1 verified specification, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4820-01-082-8833
Primary Part Number845-2181282 PIECE 66 3IN
Item NameRetainer,seal,stem
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerNaval Sea Systems Command
StatusACTIVE
General Characteristics Item DescriptionTIN BRONZE PER QQ-C-390 SPEC; FOR 3 IN. VALVE IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
4820-01-061-5106 INTERCHANGEABLE
Ball,valve
5360-01-068-732626M77-100 PC MK73 INTERCHANGEABLE
Spring,helical,compression
Electric Boat Corporation Div General Dynamics Electric Boat
4820-01-092-034326M77-100 ITEM 21 INTERCHANGEABLE
Retainer,disk,valve
Naval Ship Systems Command
4820-01-092-173226M77-100PC27 INTERCHANGEABLE
Disk Stem Ring
Electric Boat Corporation Div General Dynamics Electric Boat
4820-01-092-6147845-2181282 PIECE 3 3IN INTERCHANGEABLE
Seat,valve
Naval Ship Systems Command
5355-01-116-37662445066 ITEM 89 INTERCHANGEABLE
Pointer,valve
Naval Ship Systems Command
4820-01-116-37932620-920X12 PIECE 8 4IN INTERCHANGEABLE
Ring,disk,stem,valve
Electric Boat Corporation Div General Dynamics Electric Boat
4820-01-116-49222620-920X12 PIECE 59 4IN INTERCHANGEABLE
Ring,pointer
Electric Boat Corporation Div General Dynamics Electric Boat
4730-01-116-678326M77-100PC67 4IN INTERCHANGEABLE
Plug,pipe
Electric Boat Corporation Div General Dynamics Electric Boat
4820-01-116-68672620-920X12 PIECE 10 4IN INTERCHANGEABLE
Retainer,disk,valve
Hydro-Aire Aerospace Corp
Cross-Reference Index
Part NumberManufacturer
2620-920X12 PIECE 66 3IN Electric Boat Corporation Div General Dynamics Electric Boat (USA)
845-2181282 PIECE 66 3IN PRIMARY Naval Sea Systems Command (USA)
26M77-100PC104 PRIMARY Electric Boat Corporation Div General Dynamics Electric Boat (USA)
845-2181282 Naval Sea Systems Command (USA)
Related Parts
4820-01-061-5106INTERCHANGEABLE
BALL,VALVE
5360-01-068-7326INTERCHANGEABLE
SPRING,HELICAL,COMPRESSION
26M77-100 PC MK73
4820-01-092-0343INTERCHANGEABLE
RETAINER,DISK,VALVE
26M77-100 ITEM 21
4820-01-092-1732INTERCHANGEABLE
DISK STEM RING
26M77-100PC27
4820-01-092-6147INTERCHANGEABLE
SEAT,VALVE
845-2181282 PIECE 3 3IN
5355-01-116-3766INTERCHANGEABLE
POINTER,VALVE
2445066 ITEM 89
4820-01-116-3793INTERCHANGEABLE
RING,DISK,STEM,VALVE
2620-920X12 PIECE 8 4IN
4820-01-116-4922INTERCHANGEABLE
RING,POINTER
2620-920X12 PIECE 59 4IN
4730-01-116-6783INTERCHANGEABLE
PLUG,PIPE
26M77-100PC67 4IN
4820-01-116-6867INTERCHANGEABLE
RETAINER,DISK,VALVE
2620-920X12 PIECE 10 4IN
4820-01-117-0973INTERCHANGEABLE
GUIDE,PLUNGER,VALVE
2620-920X12 PIECE 41
3040-01-117-3702INTERCHANGEABLE
GEARSHAFT,BEVEL
2620-920X12 PIECE 35 4IN

Frequently Asked Questions

What is NSN 4820-01-082-8833?

NSN 4820-01-082-8833 is a Retainer,seal,stem, manufactured by Naval Sea Systems Command, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-082-8833?

NSN 4820-01-082-8833 has 4 cross-referenced part numbers: 2620-920X12 PIECE 66 3IN (Electric Boat Corporation Div General Dynamics Electric Boat), 845-2181282 PIECE 66 3IN (Naval Sea Systems Command), 26M77-100PC104 (Electric Boat Corporation Div General Dynamics Electric Boat), 845-2181282 (Naval Sea Systems Command).

What NSN replaces 4820-01-082-8833?

There are 12 known substitutes for 4820-01-082-8833: 4820-01-061-5106, 5360-01-068-7326, 4820-01-092-0343 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 845-2181282 PIECE 66 3IN?

Key specifications for 845-2181282 PIECE 66 3IN: General Characteristics Item Description: TIN BRONZE PER QQ-C-390 SPEC; FOR 3 IN. VALVE IN. 1 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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