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Technical Data Sheet
PartsTable / COMPONENT / 21-4-4721-8-8
21-4-4721-8-8 ✓ Verified by PartsTable
— · HOSE FITTING
WHAT YOU NEED TO KNOW
PTFE tape on tapered threads (NPT/BSPT) JIC/AN flare connections seal metal-to-metal — no tape
NPT != BSPT — look identical, NOT interchangeable
PRODUCT OVERVIEW

The ADAPTER,STRAIGHT,TUBE TO HOSE is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY OVERALL, seat_angle: 37.0 DEGREES FIRST END, thread_class: 2B FIRST END, connection_type: THREADED INTERNAL TUBE FIRST END, connection_style: SWIVEL NUT, FLARE (TUBE) STYLE 3 OPTIONAL END FIRST END, nominal_thread_size: 0.750 INCHES FIRST END 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 4730-01-340-5810, 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
21-4-4721-8-8
NSN: 4730-01-340-5810
FSC: 4730
CAGE: 00624 — EATON AEROQUIP LLC DBA JACKSON NORTH 1 DIV FLUID AND ELECTRICAL DISTRIBUTION (USA)
SPECIFICATIONS
materialNICKEL ALLOY OVERALL
seat_angle37.0 DEGREES FIRST END
thread_class2B FIRST END
connection_typeTHREADED INTERNAL TUBE FIRST END
connection_styleSWIVEL NUT, FLARE (TUBE) STYLE 3 OPTIONAL END FIRST END
nominal_thread_size0.750 INCHES FIRST END IN
nominal_overall_length3.200 INCHES IN
thread_quantity_per_inch16 FIRST END
thread_series_designatorUN FIRST END
nominal_inside_diameter_hose_accommodated0.500 INCHES SECOND END IN
nominal_outside_diameter_hose_accommodated0.970 INCHES SECOND END IN
nominal_outside_diameter_tube_accommodated0.500 INCHES FIRST END IN
NSN4730-01-340-5810
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 21-4-4721-8-8 · OEM ⚠ VERIFY BEFORE ORDERING NPT ≠ BSPT — tapered threads look identical but are NOT interchangeable. Wrong thread = leak. JIC (37°) ≠ AN (37°) ≠ SAE 45° — flare angles must match exactly. Measure thread pitch with gauge — visual identification is unreliable ✓ BROKER TIP Always use thread sealant (PTFE tape or pipe compound) on tapered threads (NPT/BSPT). JIC/AN flare fittings seal metal-to-metal — never use tape on flare connections PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
NOMINAL THREAD SIZE: 0.750 INCHES FIRST END IN
•
NOMINAL OUTSIDE DIAMETER HOSE ACCOMMODATED: 0.970 INCHES SECOND END IN
•
CONNECTION STYLE: SWIVEL NUT, FLARE (TUBE) STYLE 3 OPTIONAL END FIRST END
•
NOMINAL OVERALL LENGTH: 3.200 INCHES IN
•
THREAD SERIES DESIGNATOR: UN FIRST END
•
CONNECTION TYPE: THREADED INTERNAL TUBE FIRST END
•
MATERIAL: NICKEL ALLOY OVERALL
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.500 INCHES FIRST END IN
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL THREAD SIZE0.750 INCHES FIRST END IN
NOMINAL OUTSIDE DIAMETER HOSE ACCOMMODATED0.970 INCHES SECOND END IN
CONNECTION STYLESWIVEL NUT, FLARE (TUBE) STYLE 3 OPTIONAL END FIRST END
NOMINAL OVERALL LENGTH3.200 INCHES IN
THREAD SERIES DESIGNATORUN FIRST END
CONNECTION TYPETHREADED INTERNAL TUBE FIRST END
MATERIALNICKEL ALLOY OVERALL
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.500 INCHES FIRST END IN
CONNECTION TYPETHREADED EXTERNAL HOSE GRIPPING SECOND END
NOMINAL INSIDE DIAMETER HOSE ACCOMMODATED0.500 INCHES SECOND END IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 27
AH40750-20-20MInterchangeable
interchangeable cross-reference
interchangeable
4-4721-20Interchangeable
interchangeable cross-reference
interchangeable
20630-20-20MInterchangeable
interchangeable cross-reference
interchangeable
5012-16MAInterchangeable
interchangeable cross-reference
interchangeable
H4011-16-MInterchangeable
interchangeable cross-reference
interchangeable
4-411-16Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21-4-4721-8-8?
21-4-4721-8-8 is a ADAPTER,STRAIGHT,TUBE TO HOSE.
What parts can replace 21-4-4721-8-8?
There are 27 known substitutes for 21-4-4721-8-8: AH40750-20-20M, 4-4721-20, 20630-20-20M and 24 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 21-4-4721-8-8?
21-4-4721-8-8 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-340-5810. 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