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Technical Data Sheet
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278850 ✓ 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 VALVE,RELAY,AIR PRESSURE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: HEXAGON, body_length: 0.500 INCHES NOMINAL IN, body_diameter: 0.187 INCHES NOMINAL IN, cubic_measure: 0.027 CUBIC INCHES, terminal_type: WIRE LEAD. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-595-0083, 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
278850
NSN: 4730-00-595-0083
FSC: 4730
CAGE: 06853 — BENDIX COMMERCIAL VEHICLE SYSTEMS LLC DBA BENDIX COMMERCIAL VEHICLE SYSTEMS (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_styleHEXAGON
body_length0.500 INCHES NOMINAL IN
body_diameter0.187 INCHES NOMINAL IN
cubic_measure0.027 CUBIC INCHES
terminal_typeWIRE LEAD
inclosure_typeENCAPSULATED
fastener_length10.000 INCHES NOMINAL IN
terminal_length1.500 INCHES MINIMUM IN
special_featuresCOOLING SYSTEM
style_designatorAXIAL TERMINAL EACH END
thread_directionRIGHT-HAND
NSN4730-00-595-0083
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 278850 · 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 31
399163-184Interchangeable
interchangeable cross-reference
interchangeable
100548-01Interchangeable
interchangeable cross-reference
interchangeable
355-042-002Interchangeable
interchangeable cross-reference
interchangeable
749Interchangeable
interchangeable cross-reference
interchangeable
590-012Interchangeable
interchangeable cross-reference
interchangeable
10450Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 278850?
278850 is a VALVE,RELAY,AIR PRESSURE.
What parts can replace 278850?
There are 31 known substitutes for 278850: 399163-184, 100548-01, 355-042-002 and 28 more. Substitute compatibility should be verified for your specific system.
Is 278850 still available?
278850 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