PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

4902Seal,plain Encased

Proactive Components Inc Dba Proactive Components Inc · NSN 5330-00-521-6104 · FSC 5330 · No Item Name Available
Verified by PartsTable
NSN 5330-00-521-6104 — this item is cataloged by the U.S. Government under National Stock Number 5330-00-521-6104. Primary manufacturer part number: 4902.
Features
  • Seal,plain Encased — FSC 5330
  • Case Style: SQUARE
  • Seal Width: 0.343 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
  • Temp Rating: 250.0 FAHRENHEIT DEGF
  • Accommodated Shaft Maximum Rated Speed: 2000 FEET PER MINUTE FT
  • Material: WOOL SEALING ELEMENT
  • Sealing Element Style: VERTICAL
  • Housing Bore Diameter: 2.718 INCHES NOMINAL IN
Applications
  • Fluid containment and leak prevention
  • Pressure boundary maintenance
  • Environmental sealing
  • Applications requiring Wool Sealing Element construction
General Description

The Seal,plain Encased, cataloged under National Stock Number 5330-00-521-6104, is classified within Federal Supply Class 5330 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Proactive Components Inc Dba Proactive Components Inc. Government technical data includes 9 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 4 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
NSN5330-00-521-6104
Primary Part Number4902
Item NameSeal,plain Encased
FSC / FSG5330 / 53 — No Item Name Available
ManufacturerProactive Components Inc Dba Proactive Components Inc
StatusACTIVE
Case StyleSQUARE
Seal Width0.343 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
Temp Rating250.0 FAHRENHEIT DEGF
Accommodated Shaft Maximum Rated Speed2000 FEET PER MINUTE FT
MaterialWOOL SEALING ELEMENT
Sealing Element StyleVERTICAL
Housing Bore Diameter2.718 INCHES NOMINAL IN
MaterialSTEEL CASE
Accommodated Shaft Diameter1.750 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5310-00-274-84934902 INTERCHANGEABLE
Washer,flat
Triumph Engine Control Systems Llc
5330-00-395-47384902 INTERCHANGEABLE
Seal,plain
Johns Manville Intl
5905-00-448-26014902 INTERCHANGEABLE
Resistor,fixed,wire Wound,induct
Electro Scientific Industries Inc
2520-00-773-5974 INTERCHANGEABLE
Shaft Pump Drive
5930-00-943-0260 INTERCHANGEABLE
Switch,toggle
5998-01-010-08774902 INTERCHANGEABLE
Circuit Card Assembly
Electro-Metrics Corporation Dba Electro-Metrics
5120-01-073-0380GS15953-1 INTERCHANGEABLE
Tool,installer,pin
Hamilton Sundstrand Corporation Dba Collins Aerospace
5330-01-106-64314902 INTERCHANGEABLE
Seal,plain Encased
Stewart & Stevenson Power Products Llc
6105-01-260-0123 INTERCHANGEABLE
Motor,alternating Current
5120-01-378-5897 INTERCHANGEABLE
Adapter,socket Wrench
Cross-Reference Index
Part NumberManufacturer
M297A Mars Industries Inc (USA)
4902 Kelsey-Hayes Co French and Hecht Div (USA)
ES146A Waldon Inc (USA)
4902 PRIMARY Proactive Components Inc Dba Proactive Components Inc (USA)
Related Parts
5310-00-274-8493INTERCHANGEABLE
WASHER,FLAT
4902
5330-00-395-4738INTERCHANGEABLE
SEAL,PLAIN
4902
5905-00-448-2601INTERCHANGEABLE
RESISTOR,FIXED,WIRE WOUND,INDUCT
4902
2520-00-773-5974INTERCHANGEABLE
SHAFT PUMP DRIVE
5930-00-943-0260INTERCHANGEABLE
SWITCH,TOGGLE
5998-01-010-0877INTERCHANGEABLE
CIRCUIT CARD ASSEMBLY
4902
5120-01-073-0380INTERCHANGEABLE
TOOL,INSTALLER,PIN
GS15953-1
5330-01-106-6431INTERCHANGEABLE
SEAL,PLAIN ENCASED
4902
6105-01-260-0123INTERCHANGEABLE
MOTOR,ALTERNATING CURRENT
5120-01-378-5897INTERCHANGEABLE
ADAPTER,SOCKET WRENCH
4730-01-588-6804INTERCHANGEABLE
PNEUMATIC MUFFLER,EXHAUST-INTAKE
4902
5985-01-690-2392INTERCHANGEABLE
DUMMY LOAD,ELECTRICAL
490-2

Frequently Asked Questions

What is NSN 5330-00-521-6104?

NSN 5330-00-521-6104 is a Seal,plain Encased, manufactured by Proactive Components Inc Dba Proactive Components Inc, classified under FSC 5330 (No Item Name Available). Status: active.

What are the part numbers for NSN 5330-00-521-6104?

NSN 5330-00-521-6104 has 4 cross-referenced part numbers: M297A (Mars Industries Inc), 4902 (Kelsey-Hayes Co French and Hecht Div), ES146A (Waldon Inc), 4902 (Proactive Components Inc Dba Proactive Components Inc).

What NSN replaces 5330-00-521-6104?

There are 12 known substitutes for 5330-00-521-6104: 5310-00-274-8493, 5330-00-395-4738, 5905-00-448-2601 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 4902?

Key specifications for 4902: Case Style: SQUARE; Seal Width: 0.343 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN; Temp Rating: 250.0 FAHRENHEIT DEGF; Accommodated Shaft Maximum Rated Speed: 2000 FEET PER MINUTE FT. 9 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com