PartsTable
Technical Data Sheet
4H2678 ✓ 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 BOSS is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, seat_angle: 45.0 DEGREES FIRST END, thread_class: 3A ALL ENDS A, connection_style: INVERTED FLARE (TUBE) FIRST END, nominal_thread_size: 0.812 INCHES FIRST END IN, nominal_overall_length: 1.740 INCHES 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 4730-00-117-0056, 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
4H2678
NSN: 4730-00-117-0056
FSC: 4730
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
seat_angle45.0 DEGREES FIRST END
thread_class3A ALL ENDS A
connection_styleINVERTED FLARE (TUBE) FIRST END
nominal_thread_size0.812 INCHES FIRST END IN
nominal_overall_length1.740 INCHES IN
thread_series_designatorUNF ALL ENDS
reduced_passage_nominal_inside_diameter0.625 INCHES FIRST END IN
nominal_outside_diameter_tube_accommodated0.500 INCHES FIRST END IN
NSN4730-00-117-0056
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 4H2678 · 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
THREAD CLASS: 3A ALL ENDS A
NOMINAL THREAD SIZE: 0.625 INCHES SECOND END IN
SEAT ANGLE: 45.0 DEGREES FIRST END
NOMINAL OVERALL LENGTH: 1.740 INCHES IN
MATERIAL: COPPER ALLOY OVERALL
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.500 INCHES FIRST END IN
THREAD SERIES DESIGNATOR: UNF ALL ENDS
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS3A ALL ENDS A
NOMINAL THREAD SIZE0.625 INCHES SECOND END IN
NOMINAL THREAD SIZE0.812 INCHES FIRST END IN
SEAT ANGLE45.0 DEGREES FIRST END
NOMINAL OVERALL LENGTH1.740 INCHES IN
MATERIALCOPPER ALLOY OVERALL
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.500 INCHES FIRST END IN
THREAD SERIES DESIGNATORUNF ALL ENDS
CONNECTION STYLEEXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END
CONNECTION STYLEINVERTED FLARE (TUBE) FIRST END
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
13206E5351Interchangeable
interchangeable cross-reference
interchangeable
13206E53551Interchangeable
interchangeable cross-reference
interchangeable
482678Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4H2678?
4H2678 is a ADAPTER,STRAIGHT,TUBE TO BOSS.
What parts can replace 4H2678?
There are 3 known substitutes for 4H2678: 13206E5351, 13206E53551, 482678. Substitute compatibility should be verified for your specific system.
What is the NSN for 4H2678?
4H2678 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-117-0056. This indicates validated use in U.S. government and defense supply chains.
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