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Technical Data Sheet
PartsTable / COMPONENT / BM1278
BM1278 ✓ Verified by PartsTable
— · PIPE SECTION
WHAT YOU NEED TO KNOW
Schedule = wall thickness, NOT diameter Nominal pipe size != actual OD
Sch 40 and Sch 80 same OD, different wall
PRODUCT OVERVIEW

The TUBE ASSEMBLY,METAL is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY SINGLE END, design_form: PREBENT, thread_class: 2B SINGLE END, wall_thickness: 0.039 INCHES NOMINAL IN, thread_direction: RIGHT-HAND SINGLE END, seat_angle_in_deg: 45.0 SINGLE END. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4710-00-362-1858, 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
BM1278
NSN: 4710-00-362-1858
FSC: 4710
CAGE: 15434 — CUMMINS INC. (USA)
SPECIFICATIONS
materialCOPPER ALLOY SINGLE END
design_formPREBENT
thread_class2B SINGLE END
wall_thickness0.039 INCHES NOMINAL IN
thread_directionRIGHT-HAND SINGLE END
seat_angle_in_deg45.0 SINGLE END
mating_end_quantity2 SINGLE END
nominal_thread_size0.438 INCHES SINGLE END IN
end_connection_styleSWIVEL NUT, INVERTED FLARE SINGLE END
tube_outside_diameter0.252 INCHES NOMINAL IN
thread_series_designatorUNS SINGLE END
NSN4710-00-362-1858
COMPONENT DIAGRAM
PIPE SECTION — SCHEDULE = WALL THICKNESS WALL: — OD: — LENGTH: — — — PN: BM1278 · OEM ⚠ VERIFY BEFORE ORDERING Schedule = wall thickness, NOT pipe diameter. Sch 40 and Sch 80 have the same OD but different wall thickness. Nominal pipe size ≠ actual OD — a 1" pipe is actually 1.315" OD ✓ BROKER TIP Sch 40 = standard wall, Sch 80 = heavy wall (higher pressure), Sch 160 = extra heavy. Seamless pipe is required for high-pressure applications — welded pipe has lower ratings PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
END CONNECTION STYLE: SWIVEL NUT, INVERTED FLARE SINGLE END
•
NOMINAL THREAD SIZE: 0.438 INCHES SINGLE END IN
•
TUBE OUTSIDE DIAMETER: 0.252 INCHES NOMINAL IN
•
SEAT ANGLE IN DEG: 45.0 SINGLE END
•
THREAD SERIES DESIGNATOR: UNS SINGLE END
•
WALL THICKNESS: 0.039 INCHES NOMINAL IN
•
MATERIAL: COPPER TUBING
•
MATING END QUANTITY: 2 SINGLE END
TECHNICAL CHARACTERISTICS (FLIS)
END CONNECTION STYLESWIVEL NUT, INVERTED FLARE SINGLE END
NOMINAL THREAD SIZE0.438 INCHES SINGLE END IN
TUBE OUTSIDE DIAMETER0.252 INCHES NOMINAL IN
SEAT ANGLE IN DEG45.0 SINGLE END
THREAD SERIES DESIGNATORUNS SINGLE END
WALL THICKNESS0.039 INCHES NOMINAL IN
MATERIALCOPPER TUBING
MATING END QUANTITY2 SINGLE END
THREAD CLASS2B SINGLE END
THREAD DIRECTIONRIGHT-HAND SINGLE END
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
MTH50Interchangeable
interchangeable cross-reference
interchangeable
46520-0000-0018Interchangeable
interchangeable cross-reference
interchangeable
616-181649-001Interchangeable
interchangeable cross-reference
interchangeable
9479Interchangeable
interchangeable cross-reference
interchangeable
9004-1Interchangeable
interchangeable cross-reference
interchangeable
9479MLESSFANXMTRInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is BM1278?
BM1278 is a TUBE ASSEMBLY,METAL.
What parts can replace BM1278?
There are 14 known substitutes for BM1278: MTH50, 46520-0000-0018, 616-181649-001 and 11 more. Substitute compatibility should be verified for your specific system.
Is BM1278 still available?
BM1278 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