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Technical Data Sheet
PartsTable / COMPONENT / SMS-55278
SMS-55278 ✓ 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 RESTRICTOR,FLUID FLOW is a the manufacturer industrial component. Key specifications include length: 0.375 INCHES NOMINAL IN, material: STEEL COMP 304, design_type: PLATE, orifice_diameter: 1.855 INCHES MINIMUM AND 1.875 INCHES MAXIMUM IN, outside_diameter: 3.125 INCHES MINIMUM AND 3.188 INCHES MAXIMUM IN, special_features: W/THREE SREW HOLES,0.125 IN.ID,SPACED 120 DEG APART 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 4730-01-046-4890, 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
SMS-55278
NSN: 4730-01-046-4890
FSC: 4730
CAGE: 57140 — SALEM MANUFACTURING & SALES INC DIV SALEM MANUFACTURING AND SALES INC (USA)
SPECIFICATIONS
length0.375 INCHES NOMINAL IN
materialSTEEL COMP 304
design_typePLATE
orifice_diameter1.855 INCHES MINIMUM AND 1.875 INCHES MAXIMUM IN
outside_diameter3.125 INCHES MINIMUM AND 3.188 INCHES MAXIMUM IN
special_featuresW/THREE SREW HOLES,0.125 IN.ID,SPACED 120 DEG APART IN
thread_provisionUNTHREADED LOCATION NOT OTHERWISE SPECIFIED
NSN4730-01-046-4890
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: SMS-55278 · 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 PROVISION: UNTHREADED LOCATION NOT OTHERWISE SPECIFIED
•
MATERIAL: STEEL COMP 304
•
ORIFICE DIAMETER: 1.855 INCHES MINIMUM AND 1.875 INCHES MAXIMUM IN
•
DESIGN TYPE: PLATE
•
OUTSIDE DIAMETER: 3.125 INCHES MINIMUM AND 3.188 INCHES MAXIMUM IN
•
LENGTH: 0.375 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD PROVISIONUNTHREADED LOCATION NOT OTHERWISE SPECIFIED
MATERIALSTEEL COMP 304
ORIFICE DIAMETER1.855 INCHES MINIMUM AND 1.875 INCHES MAXIMUM IN
SPECIAL FEATURESW/THREE SREW HOLES,0.125 IN.ID,SPACED 120 DEG APART IN
DESIGN TYPEPLATE
OUTSIDE DIAMETER3.125 INCHES MINIMUM AND 3.188 INCHES MAXIMUM IN
LENGTH0.375 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
A36563Interchangeable
interchangeable cross-reference
interchangeable
48621Interchangeable
interchangeable cross-reference
interchangeable
A39344Interchangeable
interchangeable cross-reference
interchangeable
A36565 PIECE 60Interchangeable
interchangeable cross-reference
interchangeable
A36563PC46Interchangeable
interchangeable cross-reference
interchangeable
55278Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is SMS-55278?
SMS-55278 is a RESTRICTOR,FLUID FLOW.
What parts can replace SMS-55278?
There are 8 known substitutes for SMS-55278: A36563, 48621, A39344 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for SMS-55278?
SMS-55278 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-046-4890. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026