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H821-0702-78 — ADAPTER,STRAIGHT,PIPE TO TUBE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

H821-0702-78: ADAPTER,STRAIGHT,PIPE TO TUBE.

The ADAPTER,STRAIGHT,PIPE TO TUBE is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY OVERALL, thread_class: 2A FIRST END A, nominal_thread_size: 0.750 INCHES SECOND END IN, thread_quantity_per_inch: 12 FIRST END, thread_series_designator: NPS SECOND END, departure_from_cited_document: MATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-633-7464, 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
H821-0702-78
NSN: 4730-01-633-7464
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 96169 — ELECTRIC BOAT CORPORATION DIV GENERAL DYNAMICS ELECTRIC BOAT (USA)
SPECIFICATIONS
materialNICKEL ALLOY OVERALL
thread_class2A FIRST END A
nominal_thread_size0.750 INCHES SECOND END IN
thread_quantity_per_inch12 FIRST END
thread_series_designatorNPS SECOND END
departure_from_cited_documentMATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
criticality_code_justificationZZZW
NSN4730-01-633-7464
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: H821-0702-78 · 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
•
CRITICALITY CODE JUSTIFICATION: ZZZW
•
NOMINAL THREAD SIZE: 0.750 INCHES SECOND END IN
•
DEPARTURE FROM CITED DOCUMENT: MATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
•
THREAD CLASS: 2A FIRST END A
•
THREAD QUANTITY PER INCH: 12 FIRST END
•
MATERIAL: NICKEL ALLOY OVERALL
•
THREAD SERIES DESIGNATOR: UN FIRST END
TECHNICAL CHARACTERISTICS
CRITICALITY CODE JUSTIFICATIONZZZW
NOMINAL THREAD SIZE0.750 INCHES SECOND END IN
NOMINAL THREAD SIZE1.312 INCHES FIRST END IN
DEPARTURE FROM CITED DOCUMENTMATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS
THREAD CLASS2A FIRST END A
THREAD QUANTITY PER INCH12 FIRST END
MATERIALNICKEL ALLOY OVERALL
THREAD SERIES DESIGNATORUN FIRST END
THREAD SERIES DESIGNATORNPS SECOND END
OTHER ITEMS IN FSC 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4730-00-000-1895 4730-00-000-4289 4730-00-000-4445 4730-00-000-8373 4730-00-000-8897 4730-00-001-0007 4730-00-001-0008
SUBSTITUTES & CROSS-REFERENCES 9
ERH821-0702B59L1Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
2633-021-01 PC 90AL1Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
751-7108123-78L1Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
801-6640820 PC90AReference document
Same NSN cross-reference
Reference document — Secondary reference
H821-0701-78Reference document
Same NSN cross-reference
Reference document — Secondary reference
ERH821-0702B59Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is H821-0702-78?
H821-0702-78 is a ADAPTER,STRAIGHT,PIPE TO TUBE.
What parts can replace H821-0702-78?
There are 9 known substitutes for H821-0702-78: ERH821-0702B59L1, 2633-021-01 PC 90AL1, 751-7108123-78L1 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for H821-0702-78?
H821-0702-78 is cataloged in the U.S. Government catalog under NSN 4730-01-633-7464. 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.