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Technical Data Sheet
PartsTable / COMPONENT / 121-B-04
121-B-04 ✓ 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

CASE AND NOZZLE ASSEMBLY,TURBINE. Key specifications include part_name_assigned_by_controlling_agency: PIPE, PNEUMATIC, BRASS FITTING. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-202-9390, 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
121-B-04
NSN: 4730-00-202-9390
FSC: 4730
CAGE: 13174 — PARKER HANNIFIN CORP HOSE PRODUCTS DIV (USA)
SPECIFICATIONS
part_name_assigned_by_controlling_agencyPIPE, PNEUMATIC, BRASS FITTING
NSN4730-00-202-9390
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 121-B-04 · 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 19
A1653Interchangeable
interchangeable cross-reference
interchangeable
852686Interchangeable
interchangeable cross-reference
interchangeable
5A7043Interchangeable
interchangeable cross-reference
interchangeable
1574730Interchangeable
interchangeable cross-reference
interchangeable
21786Interchangeable
interchangeable cross-reference
interchangeable
PM21786Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 121-B-04?
121-B-04 is a CASE AND NOZZLE ASSEMBLY,TURBINE.
What parts can replace 121-B-04?
There are 19 known substitutes for 121-B-04: A1653, 852686, 5A7043 and 16 more. Substitute compatibility should be verified for your specific system.
Is 121-B-04 still available?
121-B-04 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