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3B9391 ✓ 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

SWITCH,RADIO FREQUENCY TRANSMISS. Key specifications include length: 2.000 INCHES NOMINAL IN, diameter: 0.2500 INCHES NOMINAL IN, material: PLASTIC OVERALL, body_style: SURFACE MOUNT, duty_cycle: 3.0 SECONDS ON, body_height: 0.165 INCHES MINIMUM AND 0.185 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-011-8537, 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
3B9391
NSN: 4730-00-011-8537
FSC: 4730
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
length2.000 INCHES NOMINAL IN
diameter0.2500 INCHES NOMINAL IN
materialPLASTIC OVERALL
body_styleSURFACE MOUNT
duty_cycle3.0 SECONDS ON
body_height0.165 INCHES MINIMUM AND 0.185 INCHES MAXIMUM IN
body_length0.400 INCHES NOMINAL IN
control_typeREMOTE
overall_gain40.0 DECIBELS
thread_class3B SECOND END
adjustabilityNONADJUSTABLE
flashing_rate180 PER MINUTE NOMINAL
NSN4730-00-011-8537
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 3B9391 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 33
4-010110BInterchangeable
interchangeable cross-reference
interchangeable
21110X4Interchangeable
interchangeable cross-reference
interchangeable
5061K12Interchangeable
interchangeable cross-reference
interchangeable
69031C91Interchangeable
interchangeable cross-reference
interchangeable
FP2152Interchangeable
interchangeable cross-reference
interchangeable
JHP110-189Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 3B9391?
3B9391 is a SWITCH,RADIO FREQUENCY TRANSMISS.
What parts can replace 3B9391?
There are 33 known substitutes for 3B9391: 4-010110B, 21110X4, 5061K12 and 30 more. Substitute compatibility should be verified for your specific system.
Is 3B9391 still available?
3B9391 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