PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

18021Holder,optical Element

Gyrus Acmi L.p. Dba Circon-Acmi Div · NSN 1240-00-235-2341 · FSC 1240 · No Item Name Available
Verified by PartsTable
NSN 1240-00-235-2341 — this item is cataloged by the U.S. Government under National Stock Number 1240-00-235-2341. Primary manufacturer part number: 18021.
Features
  • Holder,optical Element — FSC 1240
  • Material: STEEL
  • 1 verified cross-reference
  • Primary manufacturer: Gyrus Acmi L.p. Dba Circon-Acmi Div
Applications
  • Applications requiring Steel construction
General Description

The Holder,optical Element, cataloged under National Stock Number 1240-00-235-2341, is classified within Federal Supply Class 1240 (No Item Name Available) of the Fire Control Equipment group. The primary manufacturer of record is Gyrus Acmi L.p. Dba Circon-Acmi Div. Government technical data includes 1 verified specification, 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
NSN1240-00-235-2341
Primary Part Number18021
Item NameHolder,optical Element
FSC / FSG1240 / 12 — No Item Name Available
ManufacturerGyrus Acmi L.p. Dba Circon-Acmi Div
StatusACTIVE
MaterialSTEEL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5133-00-189-9266 INTERCHANGEABLE
Drill,twist
5935-00-196-653518-16S INTERCHANGEABLE
Connector,receptacle,electrical
Winchester Interconnect Corporation Dba Winchester Interconnect Div Winchester Interconnect Rf Corporation
3455-00-239-5611INVOLUTE 30-6 INTERCHANGEABLE
Cutter,milling,involute Gear
F & D Tool Co Inc
5905-00-259-7656 INTERCHANGEABLE
Resistor,variable,nonwire Wound,
5930-00-296-398718021-0 INTERCHANGEABLE
Switch,thermostatic
Kidde-Fenwal, Llc
4720-00-326-079318021 INTERCHANGEABLE
Duct,generator Cool
Triumph Thermal Systems - Maryland, Inc.
5330-00-424-5625 INTERCHANGEABLE
Gasket
4330-00-463-378711455071 INTERCHANGEABLE
Filter Element,fluid
Us Army Aviation and Missile Command
5330-00-579-5054383940 INTERCHANGEABLE
Gasket
Dover Pumps & Process Solutions Segment Inc Dba Blackmer Div Blackmer
5950-00-997-2048580R265H01 INTERCHANGEABLE
Reactor
Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp
Cross-Reference Index
Part NumberManufacturer
18021 PRIMARY Gyrus Acmi L.p. Dba Circon-Acmi Div (USA)
Related Parts
5133-00-189-9266INTERCHANGEABLE
DRILL,TWIST
5935-00-196-6535INTERCHANGEABLE
CONNECTOR,RECEPTACLE,ELECTRICAL
18-16S
3455-00-239-5611INTERCHANGEABLE
CUTTER,MILLING,INVOLUTE GEAR
INVOLUTE 30-6
5905-00-259-7656INTERCHANGEABLE
RESISTOR,VARIABLE,NONWIRE WOUND,
5930-00-296-3987INTERCHANGEABLE
SWITCH,THERMOSTATIC
18021-0
4720-00-326-0793INTERCHANGEABLE
DUCT,GENERATOR COOL
18021
5330-00-424-5625INTERCHANGEABLE
GASKET
4330-00-463-3787INTERCHANGEABLE
FILTER ELEMENT,FLUID
11455071
5330-00-579-5054INTERCHANGEABLE
GASKET
383940
5950-00-997-2048INTERCHANGEABLE
REACTOR
580R265H01
5962-01-075-8005INTERCHANGEABLE
MICROCIRCUIT,MEMORY
932820-224
2910-01-189-2142INTERCHANGEABLE
HOOK ASSEMBLY,GOVERNOR
18021

Frequently Asked Questions

What is NSN 1240-00-235-2341?

NSN 1240-00-235-2341 is a Holder,optical Element, manufactured by Gyrus Acmi L.p. Dba Circon-Acmi Div, classified under FSC 1240 (No Item Name Available). Status: active.

What are the part numbers for NSN 1240-00-235-2341?

NSN 1240-00-235-2341 has 1 cross-referenced part number: 18021 (Gyrus Acmi L.p. Dba Circon-Acmi Div).

What NSN replaces 1240-00-235-2341?

There are 12 known substitutes for 1240-00-235-2341: 5133-00-189-9266, 5935-00-196-6535, 3455-00-239-5611 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 18021?

Key specifications for 18021: Material: STEEL; Overall Height: 0.620 INCHES NOMINAL IN; Overall Length: 5.940 INCHES NOMINAL IN; Overall Width: 4.000 INCHES NOMINAL IN. 4 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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