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Technical Data Sheet
PartsTable / COMPONENT / 299-09
299-09 ✓ 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 RING SET,PISTON is a the manufacturer industrial component. Key specifications include material: STEEL COMP 303. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-189-3018, 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
299-09
NSN: 4730-00-189-3018
FSC: 4730
CAGE: 0KDP7 — KIDDE-FENWAL, LLC (USA)
SPECIFICATIONS
materialSTEEL COMP 303
NSN4730-00-189-3018
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 299-09 · 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
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.250 INCHES FIRST END IN
•
SURFACE TREATMENT: CADMIUM OUTSIDE
•
NOMINAL THREAD SIZE: 0.125 INCHES SECOND END IN
•
SEAT ANGLE: 37.0 DEGREES FIRST END
•
MATERIAL: COPPER ALLOY OVERALL
•
LEG LENGTH: 0.625 INCHES NOMINAL SECOND END IN
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.250 INCHES FIRST END IN
SURFACE TREATMENTCADMIUM OUTSIDE
SURFACE TREATMENTCADMIUM INSIDE
SURFACE TREATMENTCADMIUM INSIDE
NOMINAL THREAD SIZE0.125 INCHES SECOND END IN
SEAT ANGLE37.0 DEGREES FIRST END
MATERIALCOPPER ALLOY OVERALL
LEG LENGTH0.625 INCHES NOMINAL SECOND END IN
SPECIFICATION/STANDARD DATA96906-MS20823 GOVERNMENT STANDARD
THREAD SERIES DESIGNATORUNIFIED NATIONAL JOINT FINE (UNJF) FIRST END
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
1611203PC1Interchangeable
interchangeable cross-reference
interchangeable
5274Interchangeable
interchangeable cross-reference
interchangeable
MS20823Interchangeable
interchangeable cross-reference
interchangeable
MS20823-25DInterchangeable
interchangeable cross-reference
interchangeable
AN823-25DInterchangeable
interchangeable cross-reference
interchangeable
MS20823-10BInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 299-09?
299-09 is a RING SET,PISTON.
What parts can replace 299-09?
There are 19 known substitutes for 299-09: 1611203PC1, 5274, MS20823 and 16 more. Substitute compatibility should be verified for your specific system.
Is 299-09 still available?
299-09 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