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181A321 — COLLAR,AIR CONDITIONING-HEATING

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

181A321: COLLAR,AIR CONDITIONING-HEATING.

COLLAR,AIR CONDITIONING-HEATING. Key specifications include length: 1.500 INCHES IN, material: ALUMINUM ALLOY, overall_length: 1.500 INCHES NOMINAL IN, overall_diameter: 7.100 INCHES NOMINAL IN, style_designator: ROUND, overall_thickness: 0.035 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4520-01-396-7782, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
181A321
NSN: 4520-01-396-7782
FSC: 4520 — Space and Water Heating Equipment
CAGE: 03640 — LOCKHEED MARTIN CORPORATION DIV ROTARY AND MISSION SYSTEMS (USA)
SPECIFICATIONS
length1.500 INCHES IN
materialALUMINUM ALLOY
overall_length1.500 INCHES NOMINAL IN
overall_diameter7.100 INCHES NOMINAL IN
style_designatorROUND
overall_thickness0.035 INCHES NOMINAL IN
sheet_metal_gage_size20
fitting_overall_length1.500 INCHES NOMINAL IN
fitting_inside_diameter7.100 INCHES NOMINAL IN
NSN4520-01-396-7782
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available COLLAR,AIR CONDITIONING-HEATING TITLE COMPONENT PN 181A321 MFR COLLAR,AIR CONDITIONIN
KEY FEATURES
•
FITTING INSIDE DIAMETER: 7.100 INCHES NOMINAL IN
•
OVERALL DIAMETER: 7.100 INCHES NOMINAL IN
•
OVERALL THICKNESS: 0.035 INCHES NOMINAL IN
•
STYLE DESIGNATOR: ROUND
•
SHEET METAL GAGE SIZE: 20
•
LENGTH: 1.500 INCHES IN
•
MATERIAL: ALUMINUM ALLOY
TECHNICAL CHARACTERISTICS
FITTING INSIDE DIAMETER7.100 INCHES NOMINAL IN
OVERALL DIAMETER7.100 INCHES NOMINAL IN
OVERALL THICKNESS0.035 INCHES NOMINAL IN
STYLE DESIGNATORROUND
OVERALL LENGTH1.500 INCHES NOMINAL IN
SHEET METAL GAGE SIZE20
LENGTH1.500 INCHES IN
MATERIALALUMINUM ALLOY
FITTING OVERALL LENGTH1.500 INCHES NOMINAL IN
OTHER ITEMS IN FSC 4520 — Space and Water Heating Equipment
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4520-00-000-0098 4520-00-000-0099 4520-00-001-1240 4520-00-001-3518 4520-00-001-3519 4520-00-001-6052 4520-00-001-6298 4520-00-001-7726
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 181A321?
181A321 is a COLLAR,AIR CONDITIONING-HEATING.
What is the NSN for 181A321?
181A321 is cataloged in the U.S. Government catalog under NSN 4520-01-396-7782. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.