PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

12203Seal,plain Encased

Harbormaster Marine, Inc · NSN 5330-00-291-7742 · FSC 5330 · No Item Name Available
Verified by PartsTable
NSN 5330-00-291-7742 — this item is cataloged by the U.S. Government under National Stock Number 5330-00-291-7742. Primary manufacturer part number: 12203.
Features
  • Seal,plain Encased — FSC 5330
  • Housing Bore Diameter: 3.000 INCHES NOMINAL IN
  • Sealing Element Style: ANGULAR
  • Material: LEATHER SEALING ELEMENT
  • Accommodated Shaft Diameter: 2.125 INCHES NOMINAL IN
  • Material: STEEL CASE
  • Accommodated Shaft Maximum Rated Speed: 2000 FEET PER MINUTE FT
  • Case Style: SQUARE
Applications
  • Fluid containment and leak prevention
  • Pressure boundary maintenance
  • Environmental sealing
  • Applications requiring Leather Sealing Element construction
General Description

The Seal,plain Encased, cataloged under National Stock Number 5330-00-291-7742, is classified within Federal Supply Class 5330 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Harbormaster Marine, Inc. Government technical data includes 8 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. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5330-00-291-7742
Primary Part Number12203
Item NameSeal,plain Encased
FSC / FSG5330 / 53 — No Item Name Available
ManufacturerHarbormaster Marine, Inc
StatusACTIVE
Housing Bore Diameter3.000 INCHES NOMINAL IN
Sealing Element StyleANGULAR
MaterialLEATHER SEALING ELEMENT
Accommodated Shaft Diameter2.125 INCHES NOMINAL IN
MaterialSTEEL CASE
Accommodated Shaft Maximum Rated Speed2000 FEET PER MINUTE FT
Case StyleSQUARE
Seal Width0.500 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
6625-00-050-66891220-3 INTERCHANGEABLE
Voltmeter
Jewell Instruments Llc
5133-00-189-9248 INTERCHANGEABLE
Drill,twist
5330-00-297-619233524 INTERCHANGEABLE
Seal,plain Encased
Skf Usa Inc. Dba Skf Aerospace Sealing Solutions
5950-00-316-612112203 INTERCHANGEABLE
Reactor
Standex Electronics, Inc.
5340-00-353-299312203 INTERCHANGEABLE
Bellows,protection
Tld Wollard Llc
6350-00-389-4584N12203 INTERCHANGEABLE
Valve,pilot
Leslie Controls, Inc. Dba Leslie Controls Inc
4310-00-705-6933 INTERCHANGEABLE
Vacuum Pump
5975-00-877-6893 INTERCHANGEABLE
Bushing,electrical Conduit
2520-01-099-10990014304 INTERCHANGEABLE
Parts Kit,hydraulic Transmission
Parker Hannifin Corporation Div Cylinder Division
5950-01-100-119261901-010 INTERCHANGEABLE
Transformer,power
Dynalec Corporation
Cross-Reference Index
Part NumberManufacturer
12203 PRIMARY Harbormaster Marine, Inc (USA)
Related Parts
6625-00-050-6689INTERCHANGEABLE
VOLTMETER
1220-3
5133-00-189-9248INTERCHANGEABLE
DRILL,TWIST
5330-00-297-6192INTERCHANGEABLE
SEAL,PLAIN ENCASED
33524
5950-00-316-6121INTERCHANGEABLE
REACTOR
12203
5340-00-353-2993INTERCHANGEABLE
BELLOWS,PROTECTION
12203
6350-00-389-4584INTERCHANGEABLE
VALVE,PILOT
N12203
4310-00-705-6933INTERCHANGEABLE
VACUUM PUMP
5975-00-877-6893INTERCHANGEABLE
BUSHING,ELECTRICAL CONDUIT
2520-01-099-1099INTERCHANGEABLE
PARTS KIT,HYDRAULIC TRANSMISSION
0014304
5950-01-100-1192INTERCHANGEABLE
TRANSFORMER,POWER
61901-010
6150-01-114-6607INTERCHANGEABLE
CABLE ASSEMBLY,POWER,ELECTRICAL
17601
5950-01-140-1246INTERCHANGEABLE
TRANSFORMER,POWER
1220B-3

Frequently Asked Questions

What is NSN 5330-00-291-7742?

NSN 5330-00-291-7742 is a Seal,plain Encased, manufactured by Harbormaster Marine, Inc, classified under FSC 5330 (No Item Name Available). Status: active.

What are the part numbers for NSN 5330-00-291-7742?

NSN 5330-00-291-7742 has 1 cross-referenced part number: 12203 (Harbormaster Marine, Inc).

What NSN replaces 5330-00-291-7742?

There are 12 known substitutes for 5330-00-291-7742: 6625-00-050-6689, 5133-00-189-9248, 5330-00-297-6192 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 12203?

Key specifications for 12203: Housing Bore Diameter: 3.000 INCHES NOMINAL IN; Sealing Element Style: ANGULAR; Material: LEATHER SEALING ELEMENT; Accommodated Shaft Diameter: 2.125 INCHES NOMINAL IN. 8 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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