PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

4521Gasket

L & L Boiler Maintenance Inc · NSN 5330-00-405-9178 · FSC 5330 · No Item Name Available
Verified by PartsTable
NSN 5330-00-405-9178 — this item is cataloged by the U.S. Government under National Stock Number 5330-00-405-9178. Primary manufacturer part number: 4521.
Features
  • Gasket — FSC 5330
  • Cross-Sectional Shape Style: SOLID SINGLE OR COMPOSITION
  • Cross-Sectional Thickness: 0.031 INCHES NOMINAL IN
  • Material Document and Classification: MIL-G-12803,NO. F326128-6 MIL SPEC ALL MATERIAL RESPONSES OVERALL
  • Outside Edge to Bolt Hole Center Distance Along Length: 0.219 INCHES NOMINAL IN
  • Outside Corner Radius: 0.156 INCHES NOMINAL IN
  • Aperture Length: 2.406 INCHES NOMINAL IN
  • Outside Edge to Bolt Hole Center Distance Along Width: 0.219 INCHES NOMINAL IN
Applications
  • Fluid containment and leak prevention
  • Pressure boundary maintenance
  • Environmental sealing
General Description

The Gasket, cataloged under National Stock Number 5330-00-405-9178, is classified within Federal Supply Class 5330 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is L & L Boiler Maintenance Inc. Government technical data includes 11 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 11 commercial cross-references from 10 manufacturers, enabling identification through both NSN and commercial part number lookups. 8 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5330-00-405-9178
Primary Part Number4521
Item NameGasket
FSC / FSG5330 / 53 — No Item Name Available
ManufacturerL & L Boiler Maintenance Inc
StatusCANCELLED
Cross-Sectional Shape StyleSOLID SINGLE OR COMPOSITION
Cross-Sectional Thickness0.031 INCHES NOMINAL IN
Material Document and ClassificationMIL-G-12803,NO. F326128-6 MIL SPEC ALL MATERIAL RESPONSES OVERALL
Outside Edge to Bolt Hole Center Distance Along Length0.219 INCHES NOMINAL IN
Outside Corner Radius0.156 INCHES NOMINAL IN
Aperture Length2.406 INCHES NOMINAL IN
Outside Edge to Bolt Hole Center Distance Along Width0.219 INCHES NOMINAL IN
Aperture Width1.562 INCHES NOMINAL IN
Center to Center Distance Between Bolt Holes Along Length1.562 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
Hole Diameter0.180 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
Center to Center Distance Between Bolt Holes Along Width1.375 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 8
6240-00-155-7780 INTERCHANGEABLE
Lamp,incandescent
5930-00-272-12783-6018 INTERCHANGEABLE
Switch,push
Balkamp Inc
5905-00-539-23431JB3492-1 INTERCHANGEABLE
Resistor,adjustable
Westinghouse Electric Corp
5360-01-050-2948N04521 INTERCHANGEABLE
Spring,helical,compression
Leslie Controls, Inc. Dba Leslie Controls Inc
6625-01-087-73074521 INTERCHANGEABLE
Wattmeter
Bird Electronic Corporation Div Bird Electronic Corp
6220-01-190-32354521 INTERCHANGEABLE
Directional Light,vehicular
Federal-Mogul Corp Government Sales Dept
1005-01-328-2207 INTERCHANGEABLE
Barrel,shotgun
5315-01-617-1637 INTERCHANGEABLE
Pin,quick Release
Cross-Reference Index
Part NumberManufacturer
P23574 Trico Industries Inc Columbian Div (USA)
609270 Aqua-Chem Inc Cleaver-Brooks Div (USA)
80A046 Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Multiple (USA)
4521 PRIMARY L & L Boiler Maintenance Inc (USA)
00922 Defense Logistics Agency Dba Defense Supply Center Philadelphia (USA)
P23574 PRIMARY Honeywell International Inc Div Aerospace-South Bend (bendix Dr) (USA)
609270 PRIMARY Aqua-Chem, Inc. Dba Aqua-Chem Inc (USA)
4521 D & J Parts Inc (USA)
P23574 Bendix Corp the Brake and Steering Div (USA)
080-000046 PRIMARY Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Multiple (USA)
P23574 Wisconsin Motors, Llc (USA)
Related Parts
6240-00-155-7780INTERCHANGEABLE
LAMP,INCANDESCENT
5930-00-272-1278INTERCHANGEABLE
SWITCH,PUSH
3-6018
5905-00-539-2343INTERCHANGEABLE
RESISTOR,ADJUSTABLE
1JB3492-1
5360-01-050-2948INTERCHANGEABLE
SPRING,HELICAL,COMPRESSION
N04521
6625-01-087-7307INTERCHANGEABLE
WATTMETER
4521
6220-01-190-3235INTERCHANGEABLE
DIRECTIONAL LIGHT,VEHICULAR
4521
1005-01-328-2207INTERCHANGEABLE
BARREL,SHOTGUN
5315-01-617-1637INTERCHANGEABLE
PIN,QUICK RELEASE

Frequently Asked Questions

What is NSN 5330-00-405-9178?

NSN 5330-00-405-9178 is a Gasket, manufactured by L & L Boiler Maintenance Inc, classified under FSC 5330 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5330-00-405-9178?

NSN 5330-00-405-9178 has 11 cross-referenced part numbers: P23574 (Trico Industries Inc Columbian Div), 609270 (Aqua-Chem Inc Cleaver-Brooks Div), 80A046 (Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp Div Multiple), 4521 (L & L Boiler Maintenance Inc), 00922 (Defense Logistics Agency Dba Defense Supply Center Philadelphia) and 6 more.

What NSN replaces 5330-00-405-9178?

There are 8 known substitutes for 5330-00-405-9178: 6240-00-155-7780, 5930-00-272-1278, 5905-00-539-2343 and 5 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 4521?

Key specifications for 4521: Cross-Sectional Shape Style: SOLID SINGLE OR COMPOSITION; Cross-Sectional Thickness: 0.031 INCHES NOMINAL IN; Material Document and Classification: MIL-G-12803,NO. F326128-6 MIL SPEC ALL MATERIAL RESPONSES OVERALL; Outside Edge to Bolt Hole Center Distance Along Length: 0.219 INCHES NOMINAL IN. 13 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5330-00-405-9178 still in active supply?

NSN 5330-00-405-9178 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

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