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PartsTable / COMPONENT / MIL-H-81581
MIL-H-81581 ✓ Verified by PartsTable
— · PIPE SECTION
WHAT YOU NEED TO KNOW
Schedule = wall thickness, NOT diameter Nominal pipe size != actual OD
Sch 40 and Sch 80 same OD, different wall
PRODUCT OVERVIEW

The RADAR SET SUBASSEMBLY is a the manufacturer industrial component. Key specifications include seat_angle: 45.0 DEGREES SECOND END, thread_class: 3B FIRST END, connection_type: THREADED INTERNAL TUBE FIRST END, inside_diameter: 0.562 INCHES NOMINAL IN, connection_style: SWIVEL NUT FLARE SECOND END, outside_diameter: 0.688 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4720-00-045-8090, 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
MIL-H-81581
NSN: 4720-00-045-8090
FSC: 4720
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
seat_angle45.0 DEGREES SECOND END
thread_class3B FIRST END
connection_typeTHREADED INTERNAL TUBE FIRST END
inside_diameter0.562 INCHES NOMINAL IN
connection_styleSWIVEL NUT FLARE SECOND END
outside_diameter0.688 INCHES NOMINAL IN
thread_directionRIGHT-HAND FIRST END
nominal_thread_size0.438 INCHES SECOND END IN
end_connection_designSTRAIGHT SECOND END
inside_surface_conditionSMOOTH
thread_series_designatorUNIFIED NATIONAL JOINT FINE (UNJF) SECOND END
cross-sectional_shape_styleROUND
NSN4720-00-045-8090
COMPONENT DIAGRAM
PIPE SECTION — SCHEDULE = WALL THICKNESS WALL: — OD: — LENGTH: — — — PN: MIL-H-81581 · OEM ⚠ VERIFY BEFORE ORDERING Schedule = wall thickness, NOT pipe diameter. Sch 40 and Sch 80 have the same OD but different wall thickness. Nominal pipe size ≠ actual OD — a 1" pipe is actually 1.315" OD ✓ BROKER TIP Sch 40 = standard wall, Sch 80 = heavy wall (higher pressure), Sch 160 = extra heavy. Seamless pipe is required for high-pressure applications — welded pipe has lower ratings PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
CONNECTION TYPE: PLAIN FIRST END
•
CROSS-SECTIONAL SHAPE STYLE: ROUND
•
OPERATING PRESSURE: 40.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS
•
STYLE DESIGNATOR: HELICALLY WOUND CONTINOUS WIRE SUPPORTED
•
MEASURING METHOD AND LENGTH: 72.000 INCHES NOMINAL OVERALL IN
•
INSIDE DIAMETER: 0.875 INCHES NOMINAL FIRST END IN
•
WALL THICKNESS: 0.109 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
CONNECTION TYPEPLAIN FIRST END
CROSS-SECTIONAL SHAPE STYLEROUND
OPERATING PRESSURE40.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS
SPECIAL FEATURESEXTERIOR COLOR IS GREEN
STYLE DESIGNATORHELICALLY WOUND CONTINOUS WIRE SUPPORTED
MEASURING METHOD AND LENGTH72.000 INCHES NOMINAL OVERALL IN
INSIDE DIAMETER0.875 INCHES NOMINAL FIRST END IN
WALL THICKNESS0.109 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 28
266AS100Interchangeable
interchangeable cross-reference
interchangeable
A80910-6Interchangeable
interchangeable cross-reference
interchangeable
12111-1Interchangeable
interchangeable cross-reference
interchangeable
REDARA10060-10Interchangeable
interchangeable cross-reference
interchangeable
HC200B96Interchangeable
interchangeable cross-reference
interchangeable
MS22055B96Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MIL-H-81581?
MIL-H-81581 is a RADAR SET SUBASSEMBLY.
What parts can replace MIL-H-81581?
There are 28 known substitutes for MIL-H-81581: 266AS100, A80910-6, 12111-1 and 25 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MIL-H-81581?
MIL-H-81581 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4720-00-045-8090. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026