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PartsTable / COMPONENT / AL581-31
AL581-31 ✓ 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,AIR DUCT is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY FIRST END COUPLING, coupling_style: RAISED FACE FLANGE FIRST END, wall_thickness: 0.050 INCHES NOMINAL IN, connection_type: COUPLING FIRST END, inside_diameter: 2.750 INCHES NOMINAL FIRST END IN, style_designator: HELICALLY WOUND CONTINOUS WIRE SUPPORTED. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4720-00-307-0395, 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
AL581-31
NSN: 4720-00-307-0395
FSC: 4720
CAGE: 98891 — HBD INDUSTRIES, INC (USA)
SPECIFICATIONS
materialALUMINUM ALLOY FIRST END COUPLING
coupling_styleRAISED FACE FLANGE FIRST END
wall_thickness0.050 INCHES NOMINAL IN
connection_typeCOUPLING FIRST END
inside_diameter2.750 INCHES NOMINAL FIRST END IN
special_featuresITEM HAS A PLAIN FLANGE CONNECTION HEXIGON SHAPED W/SIX MTG HOLES 0.280 IN. DIA EQUALLY SPACED ON 4.364 IN. BOLT CIRCLE DIA;LOCATED 5.250 IN. FROM 1ST END TO CENTER OF CONNECTION IN
style_designatorHELICALLY WOUND CONTINOUS WIRE SUPPORTED
features_providedSCUFF STRIP
surface_treatmentENAMEL FIRST END COUPLING
cross-sectional_shape_styleROUND
measuring_method_and_length18.000 INCHES NOMINAL OVERALL IN
NSN4720-00-307-0395
COMPONENT DIAGRAM
PIPE SECTION — SCHEDULE = WALL THICKNESS WALL: — OD: — LENGTH: — — — PN: AL581-31 · 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
•
STYLE DESIGNATOR: HELICALLY WOUND CONTINOUS WIRE SUPPORTED
•
COUPLING STYLE: RAISED FACE FLANGE FIRST END
•
CONNECTION TYPE: COUPLING FIRST END
•
FEATURES PROVIDED: SCUFF STRIP
•
MEASURING METHOD AND LENGTH: 18.000 INCHES NOMINAL OVERALL IN
•
MATERIAL: ALUMINUM ALLOY FIRST END COUPLING
•
SURFACE TREATMENT: ENAMEL FIRST END COUPLING
•
WALL THICKNESS: 0.050 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
STYLE DESIGNATORHELICALLY WOUND CONTINOUS WIRE SUPPORTED
COUPLING STYLERAISED FACE FLANGE FIRST END
CONNECTION TYPECOUPLING FIRST END
FEATURES PROVIDEDSCUFF STRIP
MEASURING METHOD AND LENGTH18.000 INCHES NOMINAL OVERALL IN
MATERIALALUMINUM ALLOY FIRST END COUPLING
SURFACE TREATMENTENAMEL FIRST END COUPLING
WALL THICKNESS0.050 INCHES NOMINAL IN
INSIDE DIAMETER2.750 INCHES NOMINAL FIRST END IN
CROSS-SECTIONAL SHAPE STYLEROUND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
91064Interchangeable
interchangeable cross-reference
interchangeable
GVC-84Interchangeable
interchangeable cross-reference
interchangeable
03212Interchangeable
interchangeable cross-reference
interchangeable
125108LBInterchangeable
interchangeable cross-reference
interchangeable
3212Interchangeable
interchangeable cross-reference
interchangeable
193Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AL581-31?
AL581-31 is a HOSE ASSEMBLY,AIR DUCT.
What parts can replace AL581-31?
There are 7 known substitutes for AL581-31: 91064, GVC-84, 03212 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for AL581-31?
AL581-31 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4720-00-307-0395. 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