PartsTable
Technical Data Sheet
PartsTable / MRO / 1B3
1B3 ✓ Verified by PartsTable
— · MRO · MRO_GENERAL
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

FILTER,RADIO FREQUENCY INTERFERE. Key specifications include material: COPPER ALLOY OVERALL, body_width: 1.750 INCHES NOMINAL IN, body_length: 0.940 INCHES NOMINAL IN, body_material: METAL, overall_width: 9.750 INCHES NOMINAL IN, inclosure_type: ENCASED. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-273-3398, 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
MRO→ MRO_GENERAL→ 1B3
NSN: 4730-00-273-3398
FSC: 4730
CAGE: 73992 — TUTHILL CORP HANSEN COUPLING DIV (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
body_width1.750 INCHES NOMINAL IN
body_length0.940 INCHES NOMINAL IN
body_materialMETAL
overall_width9.750 INCHES NOMINAL IN
inclosure_typeENCASED
overall_height0.650 INCHES NOMINAL IN
overall_length2.500 INCHES NOMINAL IN
connection_typeTHREADED EXTERNAL PIPE FIRST END
connection_stylePLAIN (PIPE) FIRST END
style_designatorRECTANGULAR TERMINAL/TERMINALS ON OPPOSITE SURFACES
nominal_thread_size0.125 INCHES FIRST END IN
NSN4730-00-273-3398
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 1B3 · 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 (PIPE) FIRST END
•
THREAD SERIES DESIGNATOR: NPT FIRST END
•
CONNECTION TYPE: THREADED EXTERNAL PIPE FIRST END
•
MATERIAL: COPPER ALLOY OVERALL
•
NOMINAL INSIDE DIAMETER HOSE ACCOMMODATED: 0.250 INCHES SECOND END IN
•
NOMINAL THREAD SIZE: 0.125 INCHES FIRST END IN
•
FURNISHED ITEMS AND QUANTITY: 1 GROMMET AND 1 HOSE COUPLING NUT
TECHNICAL CHARACTERISTICS (FLIS)
CONNECTION STYLEPLAIN (PIPE) FIRST END
THREAD SERIES DESIGNATORNPT FIRST END
CONNECTION TYPETHREADED EXTERNAL PIPE FIRST END
MATERIALCOPPER ALLOY OVERALL
NOMINAL INSIDE DIAMETER HOSE ACCOMMODATED0.250 INCHES SECOND END IN
CONNECTION STYLEGRIPPING NIPPLE (NOSE) SECOND END
NOMINAL THREAD SIZE0.125 INCHES FIRST END IN
FURNISHED ITEMS AND QUANTITY1 GROMMET AND 1 HOSE COUPLING NUT
NOMINAL OUTSIDE DIAMETER HOSE ACCOMMODATED0.500 INCHES SECOND END IN
NOMINAL PIPE SIZE ACCOMMODATED0.125 INCHES FIRST END IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
541614Interchangeable
interchangeable cross-reference
interchangeable
362745PC3Interchangeable
interchangeable cross-reference
interchangeable
1B3Interchangeable
interchangeable cross-reference
interchangeable
5025-902Interchangeable
interchangeable cross-reference
interchangeable
269002Interchangeable
interchangeable cross-reference
interchangeable
2897491-1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1B3?
1B3 is a FILTER,RADIO FREQUENCY INTERFERE. It is classified as a MRO (MRO_GENERAL).
What parts can replace 1B3?
There are 7 known substitutes for 1B3: 541614, 362745PC3, 1B3 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1B3?
1B3 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-273-3398. 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