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5R6398 ✓ 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 COUPLING HALF,QUICK DISCONNECT is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_type: SOLID, core_depth: 0.520 INCHES MINIMUM AND 0.560 INCHES MAXIMUM IN, pin_length: 0.125 INCHES NOMINAL IN, point_type: SPLIT, head_height: 0.278 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-844-1838, 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
5R6398
NSN: 4730-00-844-1838
FSC: 4730
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
materialSTEEL OVERALL
head_typeSOLID
core_depth0.520 INCHES MINIMUM AND 0.560 INCHES MAXIMUM IN
pin_length0.125 INCHES NOMINAL IN
point_typeSPLIT
head_height0.278 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN
point_angle135.0 DEGREES NOMINAL
shank_styleHEXAGON
flute_length1.875 INCHES NOMINAL IN
pin_diameter0.047 INCHES NOMINAL IN
thread_class2A EXTERNAL A
thread_length0.214 INCHES MINIMUM AND 0.239 INCHES MAXIMUM EXTERNAL IN
NSN4730-00-844-1838
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 5R6398 · 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 18
BH261Interchangeable
interchangeable cross-reference
interchangeable
FD9553AInterchangeable
interchangeable cross-reference
interchangeable
FD9553Interchangeable
interchangeable cross-reference
interchangeable
X2075-15Interchangeable
interchangeable cross-reference
interchangeable
B547-193Interchangeable
interchangeable cross-reference
interchangeable
547B002636Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 5R6398?
5R6398 is a COUPLING HALF,QUICK DISCONNECT.
What parts can replace 5R6398?
There are 18 known substitutes for 5R6398: BH261, FD9553A, FD9553 and 15 more. Substitute compatibility should be verified for your specific system.
Is 5R6398 still available?
5R6398 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