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Technical Data Sheet
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9Y6518 ✓ 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 ADAPTER,STRAIGHT,PIPE TO TUBE is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY K-500 OR NICKEL ALLOY 502 OVERALL, end_style: SPRING END,SQUARED AND GROUND BOTH ENDS, blade_type: OSCILLATING, head_style: FILLISTER, blade_width: 12.5 MILLIMETERS MINIMUM AND 19.0 MILLIMETERS MAXIMUM MM, body_length: 1.562 INCHES NOMINAL 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 4730-01-350-3743, 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
9Y6518
NSN: 4730-01-350-3743
FSC: 4730
CAGE: 11083 — CATERPILLAR INC DIV CATERPILLAR DEFENSE (USA)
SPECIFICATIONS
materialNICKEL ALLOY K-500 OR NICKEL ALLOY 502 OVERALL
end_styleSPRING END,SQUARED AND GROUND BOTH ENDS
blade_typeOSCILLATING
head_styleFILLISTER
blade_width12.5 MILLIMETERS MINIMUM AND 19.0 MILLIMETERS MAXIMUM MM
body_length1.562 INCHES NOMINAL IN
head_height0.072 INCHES MINIMUM AND 0.079 INCHES MAXIMUM IN
blade_length90.0 MILLIMETERS NOMINAL MM
thread_class2A A
coil_quantity6-1/2
head_diameter0.166 INCHES MINIMUM AND 0.183 INCHES MAXIMUM IN
hole_diameter0.037 INCHES NOMINAL IN
NSN4730-01-350-3743
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 9Y6518 · 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 13
18-457-3Interchangeable
interchangeable cross-reference
interchangeable
FS16-454-2RPCBS16-449Interchangeable
interchangeable cross-reference
interchangeable
2H1118Interchangeable
interchangeable cross-reference
interchangeable
16449Interchangeable
interchangeable cross-reference
interchangeable
17514Interchangeable
interchangeable cross-reference
interchangeable
1997704-136Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 9Y6518?
9Y6518 is a ADAPTER,STRAIGHT,PIPE TO TUBE.
What parts can replace 9Y6518?
There are 13 known substitutes for 9Y6518: 18-457-3, FS16-454-2RPCBS16-449, 2H1118 and 10 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 9Y6518?
9Y6518 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-350-3743. 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