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645A870H04 — HOSE,AIR DUCT

✓ Government record, cited
— · PIPE SECTION
PRODUCT OVERVIEW

645A870H04: HOSE,AIR DUCT.

The HOSE,AIR DUCT is a the manufacturer industrial component. Key specifications include material: FIBERGLASS AND RUBBER CHLOROPRENE CLASS CR COVER, wall_thickness: 0.030 INCHES NOMINAL IN, connection_type: SOFT BOTH ENDS, inside_diameter: 4.000 INCHES NOMINAL FIRST END IN, connection_style: ROUND BOTH ENDS, style_designator: HELICALLY WOUND CONTINOUS WIRE SUPPORTED. This part is cataloged in the U.S.

Government catalog under NSN 4720-01-399-1002, 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
645A870H04
NSN: 4720-01-399-1002
FSC: 4720 — Hose and Flexible Tubing
CAGE: 97942 — NORTHROP GRUMMAN SYSTEMS CORPORATION DBA NORTHROP GRUMMAN SYSTEMS CORP (USA)
SPECIFICATIONS
materialFIBERGLASS AND RUBBER CHLOROPRENE CLASS CR COVER
wall_thickness0.030 INCHES NOMINAL IN
connection_typeSOFT BOTH ENDS
inside_diameter4.000 INCHES NOMINAL FIRST END IN
connection_styleROUND BOTH ENDS
style_designatorHELICALLY WOUND CONTINOUS WIRE SUPPORTED
end_overall_length1.500 INCHES NOMINAL BOTH ENDS IN
end_inside_diameter4.000 INCHES NOMINAL BOTH ENDS IN
cross-sectional_shape_styleROUND
measuring_method_and_length24.000 INCHES NOMINAL OVERALL IN
minimum_inside_bending_radius1.000 INCHES IN
NSN4720-01-399-1002
COMPONENT DIAGRAM
PIPE SECTION — SCHEDULE = WALL THICKNESS WALL: — OD: — LENGTH: — — — PN: 645A870H04 · 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
•
MEASURING METHOD AND LENGTH: 24.000 INCHES NOMINAL OVERALL IN
•
MINIMUM INSIDE BENDING RADIUS: 1.000 INCHES IN
•
CONNECTION STYLE: ROUND BOTH ENDS
•
CONNECTION TYPE: SOFT BOTH ENDS
•
STYLE DESIGNATOR: HELICALLY WOUND CONTINOUS WIRE SUPPORTED
•
CROSS-SECTIONAL SHAPE STYLE: ROUND
•
WALL THICKNESS: 0.030 INCHES NOMINAL IN
•
INSIDE DIAMETER: 4.000 INCHES NOMINAL FIRST END IN
TECHNICAL CHARACTERISTICS
MEASURING METHOD AND LENGTH24.000 INCHES NOMINAL OVERALL IN
MINIMUM INSIDE BENDING RADIUS1.000 INCHES IN
CONNECTION STYLEROUND BOTH ENDS
CONNECTION TYPESOFT BOTH ENDS
STYLE DESIGNATORHELICALLY WOUND CONTINOUS WIRE SUPPORTED
CROSS-SECTIONAL SHAPE STYLEROUND
WALL THICKNESS0.030 INCHES NOMINAL IN
INSIDE DIAMETER4.000 INCHES NOMINAL FIRST END IN
END OVERALL LENGTH1.500 INCHES NOMINAL BOTH ENDS IN
END INSIDE DIAMETER4.000 INCHES NOMINAL BOTH ENDS IN
OTHER ITEMS IN FSC 4720 — Hose and Flexible Tubing
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4720-00-000-0080 4720-00-000-0081 4720-00-000-0084 4720-00-000-0724 4720-00-001-0014 4720-00-001-0015 4720-00-001-0023 4720-00-001-0025
SUBSTITUTES & CROSS-REFERENCES 1
0211-0400-0158Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 645A870H04?
645A870H04 is a HOSE,AIR DUCT.
What parts can replace 645A870H04?
There is 1 known substitute for 645A870H04: 0211-0400-0158. Substitute compatibility should be verified for your specific system.
What is the NSN for 645A870H04?
645A870H04 is cataloged in the U.S. Government catalog under NSN 4720-01-399-1002. 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.