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Technical Data Sheet
PartsTable / MRO / B56-3
B56-3 ✓ 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 length: 2.000 INCHES NOMINAL IN, material: PLASTIC, drive_type: RAISED RIB, design_type: THREADED, thread_class: 2A A, overall_diameter: 0.790 INCHES MINIMUM AND 0.830 INCHES MAXIMUM 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 4730-00-391-8341, 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→ B56-3
NSN: 4730-00-391-8341
FSC: 4730
CAGE: 28960 — ITT FLUID TECHNOLOGY CORP ITT MCDONNELL AND MILLER (USA)
SPECIFICATIONS
length2.000 INCHES NOMINAL IN
materialPLASTIC
drive_typeRAISED RIB
design_typeTHREADED
thread_class2A A
overall_diameter0.790 INCHES MINIMUM AND 0.830 INCHES MAXIMUM IN
special_featuresINCLUDES 0.040 TO 0.080 IN. VENT HOLE LOCATED WITHIN 0.062 IN. OF CENTER IN
features_providedBEVELED SEAT
end_item_identificationCABINET PROCESSOR
element_outside_diameter1.312 INCHES NOMINAL IN
thread_size_and_series/type_designator5/16-18 UNIFIED NATIONAL COARSE (UNC)
NSN4730-00-391-8341
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: B56-3 · 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
•
ELEMENT OUTSIDE DIAMETER: 1.312 INCHES NOMINAL IN
•
MATERIAL: COPPER ALLOY
•
LENGTH: 2.000 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
ELEMENT OUTSIDE DIAMETER1.312 INCHES NOMINAL IN
MATERIALCOPPER ALLOY
LENGTH2.000 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
B74Interchangeable
interchangeable cross-reference
interchangeable
6187K168Interchangeable
interchangeable cross-reference
interchangeable
B563Interchangeable
interchangeable cross-reference
interchangeable
927B329Interchangeable
interchangeable cross-reference
interchangeable
51104Interchangeable
interchangeable cross-reference
interchangeable
19280Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B56-3?
B56-3 is a FILTER,RADIO FREQUENCY INTERFERE. It is classified as a MRO (MRO_GENERAL).
What parts can replace B56-3?
There are 15 known substitutes for B56-3: B74, 6187K168, B563 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for B56-3?
B56-3 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-391-8341. 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