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Technical Data Sheet
PartsTable / COMPONENT / M26521-4-420
M26521-4-420 ✓ 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 HOSE ASSEMBLY,NONMETALLIC is a the manufacturer industrial component. Key specifications include connection_type: THREADED INTERNAL PIPE FIRST END, inside_diameter: 4.000 INCHES NOMINAL IN, connection_style: PLAIN SECOND END, outside_diameter: 4.625 INCHES NOMINAL IN, thread_direction: RIGHT-HAND FIRST END, operating_pressure: 175.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LOCATION NOT OTHERWISE SPECIFIED LBS. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4720-00-802-5828, 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
M26521-4-420
NSN: 4720-00-802-5828
FSC: 4720
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
connection_typeTHREADED INTERNAL PIPE FIRST END
inside_diameter4.000 INCHES NOMINAL IN
connection_stylePLAIN SECOND END
outside_diameter4.625 INCHES NOMINAL IN
thread_directionRIGHT-HAND FIRST END
operating_pressure175.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LOCATION NOT OTHERWISE SPECIFIED LBS
nominal_thread_size4.000 INCHES FIRST END IN
end_connection_designSTRAIGHT FIRST END
inside_surface_conditionSMOOTH
media_for_which_designedFUEL/OIL, HYDROCARBON AND WATER, FRESH SINGLE RESPONSE
thread_series_designatorNPT FIRST END
cross-sectional_shape_styleROUND
NSN4720-00-802-5828
COMPONENT DIAGRAM
PIPE SECTION — SCHEDULE = WALL THICKNESS WALL: — OD: — LENGTH: — — — PN: M26521-4-420 · 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 STYLE: PLAIN SECOND END
•
THREAD SERIES DESIGNATOR: NPT FIRST END
•
NOMINAL THREAD SIZE: 4.000 INCHES FIRST END IN
•
CROSS-SECTIONAL SHAPE STYLE: ROUND
•
CONNECTION TYPE: THREADED EXTERNAL PIPE SECOND END
•
OPERATING PRESSURE: 175.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LOCATION NOT OTHERWISE SPECIFIED LBS
•
MEDIA FOR WHICH DESIGNED: FUEL/OIL, HYDROCARBON AND WATER, FRESH SINGLE RESPONSE
•
INSIDE DIAMETER: 4.000 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
CONNECTION STYLEPLAIN SECOND END
THREAD SERIES DESIGNATORNPT FIRST END
NOMINAL THREAD SIZE4.000 INCHES FIRST END IN
CROSS-SECTIONAL SHAPE STYLEROUND
CONNECTION TYPETHREADED EXTERNAL PIPE SECOND END
OPERATING PRESSURE175.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LOCATION NOT OTHERWISE SPECIFIED LBS
MEDIA FOR WHICH DESIGNEDFUEL/OIL, HYDROCARBON AND WATER, FRESH SINGLE RESPONSE
INSIDE DIAMETER4.000 INCHES NOMINAL IN
END CONNECTION DESIGNSTRAIGHT SECOND END
NOMINAL THREAD SIZE4.000 INCHES SECOND END IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 25
MIL-DTL-26521Interchangeable
interchangeable cross-reference
interchangeable
MIL-H-26521Interchangeable
interchangeable cross-reference
interchangeable
M26521F6.0T3000Interchangeable
interchangeable cross-reference
interchangeable
MIL-H-27508Interchangeable
interchangeable cross-reference
interchangeable
9058AInterchangeable
interchangeable cross-reference
interchangeable
M26521A3.0R0120Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is M26521-4-420?
M26521-4-420 is a HOSE ASSEMBLY,NONMETALLIC.
What parts can replace M26521-4-420?
There are 25 known substitutes for M26521-4-420: MIL-DTL-26521, MIL-H-26521, M26521F6.0T3000 and 22 more. Substitute compatibility should be verified for your specific system.
Is M26521-4-420 still available?
M26521-4-420 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026