PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

21081Bolt,externally Relieved Body

Lucas Aerospace Power Equipment Corporation · NSN 5306-00-496-4640 · FSC 5306 · No Item Name Available
Verified by PartsTable
NSN 5306-00-496-4640 — this item is cataloged by the U.S. Government under National Stock Number 5306-00-496-4640. Primary manufacturer part number: 21081.
Features
  • Bolt,externally Relieved Body — FSC 5306
  • Nominal Thread Diameter: 0.190 INCHES IN
  • Head Diameter: 0.303 INCHES NOMINAL IN
  • Fastener Length: 1.188 INCHES NOMINAL IN
  • Head Height: 0.125 INCHES NOMINAL IN
  • Externally Relieved Body Diameter Quantity: 1
  • Material: STEEL OVERALL
  • Thread Direction: RIGHT-HAND
Applications
  • Structural fastening and assembly
  • Equipment mounting
  • Panel and housing attachment
  • Applications requiring Steel Overall construction
General Description

The Bolt,externally Relieved Body, cataloged under National Stock Number 5306-00-496-4640, is classified within Federal Supply Class 5306 (No Item Name Available) of the Hardware and Abrasives group. The primary manufacturer of record is Lucas Aerospace Power Equipment Corporation. Government technical data includes 14 verified specifications, 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. 10 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN5306-00-496-4640
Primary Part Number21081
Item NameBolt,externally Relieved Body
FSC / FSG5306 / 53 — No Item Name Available
ManufacturerLucas Aerospace Power Equipment Corporation
StatusACTIVE
Nominal Thread Diameter0.190 INCHES IN
Head Diameter0.303 INCHES NOMINAL IN
Fastener Length1.188 INCHES NOMINAL IN
Head Height0.125 INCHES NOMINAL IN
Externally Relieved Body Diameter Quantity1
MaterialSTEEL OVERALL
Thread DirectionRIGHT-HAND
Head StyleFILLISTER
Thread Length0.375 INCHES MINIMUM IN
Thread Series DesignatorUNF
Thread Quantity Per Inch32
Distance From Largest Bearing Surface of Head to End of First Diameter0.812 INCHES NOMINAL IN
First Diameter From Head0.145 INCHES NOMINAL IN
Thread Class2A A
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 10
5120-00-240-5328 INTERCHANGEABLE
Wrench,adjustable
5841-00-692-283621081 INTERCHANGEABLE
Gasket Assy,modulat
Raytheon Company Dba Raytheon
4820-00-706-4587CKRA2506005 INTERCHANGEABLE
Valve,check
The Lee Co Dba the Lee Co
6220-00-977-320421081 INTERCHANGEABLE
Base Assembly,light
Electro Switch Corp. Dba Oak Grisgsby Div Electroswitch
4920-01-060-055521081 INTERCHANGEABLE
Element,heater
Hamilton Sundstrand Corporation
7050-01-112-1115 INTERCHANGEABLE
Cover,protective
4320-01-327-4740 INTERCHANGEABLE
Pump,centrifugal
5365-01-329-720022598 INTERCHANGEABLE
Spacer,ring
Parker Hannifin Corporation Div Hydraulic Systems Division
4730-01-547-858248F-5-4 INTERCHANGEABLE
Adapter,straight,pipe to Hose
Bahcall Rubber Co Inc
5920-01-693-290921081 INTERCHANGEABLE
Fuseholder,block
Gaylord Marine Services, Inc.
Cross-Reference Index
Part NumberManufacturer
21081 Lucas Aerospace Power Equipment Corporation (USA)
H22-598 American Industrial Sales (USA)
H22-598 Lucas Aerospace Power Equipment Corporation (USA)
22598 Lucas Aerospace Power Equipment Corporation (USA)
Related Parts
5120-00-240-5328INTERCHANGEABLE
WRENCH,ADJUSTABLE
5841-00-692-2836INTERCHANGEABLE
GASKET ASSY,MODULAT
21081
4820-00-706-4587INTERCHANGEABLE
VALVE,CHECK
CKRA2506005
6220-00-977-3204INTERCHANGEABLE
BASE ASSEMBLY,LIGHT
21081
4920-01-060-0555INTERCHANGEABLE
ELEMENT,HEATER
21081
7050-01-112-1115INTERCHANGEABLE
COVER,PROTECTIVE
4320-01-327-4740INTERCHANGEABLE
PUMP,CENTRIFUGAL
5365-01-329-7200INTERCHANGEABLE
SPACER,RING
22598
4730-01-547-8582INTERCHANGEABLE
ADAPTER,STRAIGHT,PIPE TO HOSE
48F-5-4
5920-01-693-2909INTERCHANGEABLE
FUSEHOLDER,BLOCK
21081

Frequently Asked Questions

What is NSN 5306-00-496-4640?

NSN 5306-00-496-4640 is a Bolt,externally Relieved Body, manufactured by Lucas Aerospace Power Equipment Corporation, classified under FSC 5306 (No Item Name Available). Status: active.

What are the part numbers for NSN 5306-00-496-4640?

NSN 5306-00-496-4640 has 4 cross-referenced part numbers: 21081 (Lucas Aerospace Power Equipment Corporation), H22-598 (American Industrial Sales), H22-598 (Lucas Aerospace Power Equipment Corporation), 22598 (Lucas Aerospace Power Equipment Corporation).

What NSN replaces 5306-00-496-4640?

There are 10 known substitutes for 5306-00-496-4640: 5120-00-240-5328, 5841-00-692-2836, 4820-00-706-4587 and 7 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 21081?

Key specifications for 21081: Nominal Thread Diameter: 0.190 INCHES IN; Head Diameter: 0.303 INCHES NOMINAL IN; Fastener Length: 1.188 INCHES NOMINAL IN; Head Height: 0.125 INCHES NOMINAL IN. 14 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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