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Technical Data Sheet
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X1278 ✓ 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 PLUG,PIPE is a the manufacturer industrial component. Key specifications include material: IRON OVERALL, body_type: SOLID, head_type: SOLID, drive_end_style: RECESSED SQUARE, connection_style: PLAIN, thread_direction: RIGHT-HAND EXTERNAL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-293-7476, 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
X1278
NSN: 4730-00-293-7476
FSC: 4730
CAGE: 78500 — MERITOR HEAVY VEHICLE SYSTEMS, LLC (USA)
SPECIFICATIONS
materialIRON OVERALL
body_typeSOLID
head_typeSOLID
drive_end_styleRECESSED SQUARE
connection_stylePLAIN
thread_directionRIGHT-HAND EXTERNAL
surface_treatmentZINC OVERALL
operating_pressure150.000 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS
nominal_thread_size1.250 INCHES EXTERNAL IN
end_item_identificationMULTIPLE LAUNCH ROCKET SYSTEM (MLRS); ARMORED MULTI-PURPOSE VEHICLE (AMPV)
thread_series_designatorNPT EXTERNAL
nondefinitive_spec/std_data2 TYPE AND C STYLE
NSN4730-00-293-7476
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: X1278 · 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: 1.250 INCHES EXTERNAL IN
•
HEAD TYPE: SOLID
•
BODY TYPE: SOLID
•
THREAD DIRECTION: RIGHT-HAND EXTERNAL
•
MATERIAL: IRON OVERALL
•
CONNECTION STYLE: PLAIN
•
DRIVE END STYLE: RECESSED SQUARE
•
NOMINAL PIPE SIZE FOR WHICH DESIGNED: 1.250 INCHES IN
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL THREAD SIZE1.250 INCHES EXTERNAL IN
HEAD TYPESOLID
BODY TYPESOLID
THREAD DIRECTIONRIGHT-HAND EXTERNAL
MATERIALIRON OVERALL
CONNECTION STYLEPLAIN
DRIVE END STYLERECESSED SQUARE
NOMINAL PIPE SIZE FOR WHICH DESIGNED1.250 INCHES IN
THREAD SERIES DESIGNATORNPT EXTERNAL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
10309413Interchangeable
interchangeable cross-reference
interchangeable
X1278Interchangeable
interchangeable cross-reference
interchangeable
221-1847Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is X1278?
X1278 is a PLUG,PIPE.
What parts can replace X1278?
There are 3 known substitutes for X1278: 10309413, X1278, 221-1847. Substitute compatibility should be verified for your specific system.
Is X1278 still available?
X1278 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026