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PartsTable / COMPONENT / 31-AA4-4-9IN SS
31-AA4-4-9IN SS ✓ 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 seat_angle: 37.0 DEGREES FIRST END, temp_rating: -40.0 FAHRENHEIT AND 257.0 FAHRENHEIT SINGLE RESPONSE DEGF, thread_class: 3B FIRST END, connection_type: THREADED INTERNAL TUBE FIRST END, inside_diameter: 0.250 INCHES NOMINAL IN, connection_style: SWIVEL NUT FLARE FIRST END. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4720-01-382-6587, 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
31-AA4-4-9IN SS
NSN: 4720-01-382-6587
FSC: 4720
CAGE: 60848 — ALLIED SYSTEMS COMPANY DBA ALLIED SYSTEMS CO (USA)
SPECIFICATIONS
seat_angle37.0 DEGREES FIRST END
temp_rating-40.0 FAHRENHEIT AND 257.0 FAHRENHEIT SINGLE RESPONSE DEGF
thread_class3B FIRST END
connection_typeTHREADED INTERNAL TUBE FIRST END
inside_diameter0.250 INCHES NOMINAL IN
connection_styleSWIVEL NUT FLARE FIRST END
outside_diameter0.590 INCHES NOMINAL IN
thread_directionRIGHT-HAND FIRST END
features_providedNONSKIVE
operating_pressure5000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LOCATION NOT OTHERWISE SPECIFIED LBS
burst_test_pressure20000.0 POUNDS PER SQUARE INCH LBS
nominal_thread_size0.438 INCHES FIRST END IN
NSN4720-01-382-6587
COMPONENT DIAGRAM
PIPE SECTION — SCHEDULE = WALL THICKNESS WALL: — OD: — LENGTH: — — — PN: 31-AA4-4-9IN SS · 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
•
INSIDE SURFACE CONDITION: SMOOTH
•
HYDROSTATIC TEST PRESSURE: 10000.0 POUNDS PER SQUARE INCH LBS
•
MEDIA FOR WHICH DESIGNED: FUEL/OIL, HYDROCARBON SINGLE RESPONSE
•
INSIDE DIAMETER: 0.250 INCHES NOMINAL IN
•
THREAD DIRECTION: RIGHT-HAND FIRST END
•
FEATURES PROVIDED: NONSKIVE
•
LAYER COMPOSITION AND LOCATION: 1ST LAYER BRAIDED STEEL WIRE AND 2ND LAYER BRAIDED STEEL WIRE AND OUTER LAYER MOLDED RUBBER, SYNTHETIC
•
THREAD CLASS: 3B FIRST END
TECHNICAL CHARACTERISTICS (FLIS)
INSIDE SURFACE CONDITIONSMOOTH
HYDROSTATIC TEST PRESSURE10000.0 POUNDS PER SQUARE INCH LBS
MEDIA FOR WHICH DESIGNEDFUEL/OIL, HYDROCARBON SINGLE RESPONSE
INSIDE DIAMETER0.250 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND FIRST END
FEATURES PROVIDEDNONSKIVE
LAYER COMPOSITION AND LOCATION1ST LAYER BRAIDED STEEL WIRE AND 2ND LAYER BRAIDED STEEL WIRE AND OUTER LAYER MOLDED RUBBER, SYNTHETIC
THREAD CLASS3B FIRST END
OUTSIDE DIAMETER0.590 INCHES NOMINAL IN
END ITEM IDENTIFICATIONALLIED SYSTEMS CO. ELECTRIC/HYDRAULIC CRANE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
A-A-59158 TY4CL1STBInterchangeable
interchangeable cross-reference
interchangeable
3595-8Interchangeable
8TB (4x2TB) SATA-II 3.5" Hot-Swap StorCenter px12-350r
interchangeable
MIL-T-21309 TY4CL1STBInterchangeable
interchangeable cross-reference
interchangeable
8190010Interchangeable
interchangeable cross-reference
interchangeable
8190009Interchangeable
interchangeable cross-reference
interchangeable
80C739Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 31-AA4-4-9IN SS?
31-AA4-4-9IN SS is a HOSE ASSEMBLY,NONMETALLIC.
What parts can replace 31-AA4-4-9IN SS?
There are 13 known substitutes for 31-AA4-4-9IN SS: A-A-59158 TY4CL1STB, 3595-8, MIL-T-21309 TY4CL1STB and 10 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 31-AA4-4-9IN SS?
31-AA4-4-9IN SS is cataloged in the Federal Logistics Information System (FLIS) under NSN 4720-01-382-6587. 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