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4-4 520120C — ADAPTER,STRAIGHT,TUBE TO BOSS

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

4-4 520120C: ADAPTER,STRAIGHT,TUBE TO BOSS.

The ADAPTER,STRAIGHT,TUBE TO BOSS is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, thread_class: 2A ALL ENDS A, connection_type: THREADED EXTERNAL BOSS ALL ENDS, connection_style: PLAIN (TUBE) ALL ENDS BULKHEAD, nominal_thread_size: 0.5625 INCHES ALL ENDS IN, nominal_overall_length: 29.0 INCHES IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-612-8602, 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
4-4 520120C
NSN: 4730-01-612-8602
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 0U583 — SAE INTERNATIONAL DBA SAE INTERNATIONAL (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thread_class2A ALL ENDS A
connection_typeTHREADED EXTERNAL BOSS ALL ENDS
connection_stylePLAIN (TUBE) ALL ENDS BULKHEAD
nominal_thread_size0.5625 INCHES ALL ENDS IN
nominal_overall_length29.0 INCHES IN
end_item_identificationLIGHT ARMORED VEHICLES
nominal_outside_diameter6.35 INCHES ALL ENDS IN
thread_quantity_per_inch18 ALL ENDS
thread_series_designatorUN ALL ENDS
part_name_assigned_by_controlling_agencyFITTING BOSS
NSN4730-01-612-8602
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 4-4 520120C · 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
•
CONNECTION STYLE: PLAIN (TUBE) ALL ENDS BULKHEAD
•
NOMINAL OVERALL LENGTH: 29.0 INCHES IN
•
CONNECTION TYPE: THREADED EXTERNAL BOSS ALL ENDS
•
NOMINAL THREAD SIZE: 0.5625 INCHES ALL ENDS IN
•
NOMINAL OUTSIDE DIAMETER: 6.35 INCHES ALL ENDS IN
•
THREAD CLASS: 2A ALL ENDS A
TECHNICAL CHARACTERISTICS
CONNECTION STYLEPLAIN (TUBE) ALL ENDS BULKHEAD
NOMINAL OVERALL LENGTH29.0 INCHES IN
CONNECTION TYPETHREADED EXTERNAL BOSS ALL ENDS
NOMINAL THREAD SIZE0.5625 INCHES ALL ENDS IN
NOMINAL OUTSIDE DIAMETER6.35 INCHES ALL ENDS IN
PART NAME ASSIGNED BY CONTROLLING AGENCYFITTING BOSS
THREAD CLASS2A ALL ENDS A
END ITEM IDENTIFICATIONLIGHT ARMORED VEHICLES
THREAD QUANTITY PER INCH18 ALL ENDS
MATERIALSTEEL OVERALL
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 2
J1453Reference document
Same NSN cross-reference
Reference document — Secondary reference
J1453 4-4 520120CReference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 4-4 520120C?
4-4 520120C is a ADAPTER,STRAIGHT,TUBE TO BOSS.
What parts can replace 4-4 520120C?
There are 2 known substitutes for 4-4 520120C: J1453, J1453 4-4 520120C. Substitute compatibility should be verified for your specific system.
What is the NSN for 4-4 520120C?
4-4 520120C is cataloged in the U.S. Government catalog under NSN 4730-01-612-8602. 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.