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157618300 — REDUCER,BOSS

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

157618300: REDUCER,BOSS.

The REDUCER,BOSS is a the manufacturer industrial component. Key specifications include material: STEEL COMP 316 OVERALL, reducer_type: CONCENTRIC, thread_class: 3A ALL ENDS A, connection_type: THREADED EXTERNAL BOSS ALL ENDS, connection_style: EXTERNAL SEAT FOR GASKET SEAL (BOSS) ALL ENDS, operating_pressure: 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-343-5447, 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
157618300
NSN: 4730-01-343-5447
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: A0199 — LEONARDO S.P.A. - ELECTRONICS DIVISION - DEFENCE BUSINESS AREA (ITA)
SPECIFICATIONS
materialSTEEL COMP 316 OVERALL
reducer_typeCONCENTRIC
thread_class3A ALL ENDS A
connection_typeTHREADED EXTERNAL BOSS ALL ENDS
connection_styleEXTERNAL SEAT FOR GASKET SEAL (BOSS) ALL ENDS
operating_pressure3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
nominal_thread_size0.562 INCHES SECOND END IN
maximum_operating_temp225.0 FAHRENHEIT SINGLE RESPONSE DEGF
nominal_overall_length1.344 INCHES IN
media_for_which_designedOXYGEN, GASEOUS SECOND RESPONSE
thread_series_designatorUNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS
NSN4730-01-343-5447
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 157618300 · 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
•
CONNECTION STYLE: EXTERNAL SEAT FOR GASKET SEAL (BOSS) ALL ENDS
•
NOMINAL OVERALL LENGTH: 1.344 INCHES IN
•
CONNECTION TYPE: THREADED EXTERNAL BOSS ALL ENDS
•
OPERATING PRESSURE: 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
•
NOMINAL THREAD SIZE: 0.562 INCHES SECOND END IN
•
MAXIMUM OPERATING TEMP: 225.0 FAHRENHEIT SINGLE RESPONSE DEGF
•
MEDIA FOR WHICH DESIGNED: OXYGEN, GASEOUS SECOND RESPONSE
TECHNICAL CHARACTERISTICS
CONNECTION STYLEEXTERNAL SEAT FOR GASKET SEAL (BOSS) ALL ENDS
NOMINAL OVERALL LENGTH1.344 INCHES IN
CONNECTION TYPETHREADED EXTERNAL BOSS ALL ENDS
OPERATING PRESSURE3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
NOMINAL THREAD SIZE0.562 INCHES SECOND END IN
NOMINAL THREAD SIZE0.750 INCHES FIRST END IN
MAXIMUM OPERATING TEMP225.0 FAHRENHEIT SINGLE RESPONSE DEGF
MEDIA FOR WHICH DESIGNEDOXYGEN, GASEOUS SECOND RESPONSE
MEDIA FOR WHICH DESIGNEDHYDRAULIC FLUID FIRST RESPONSE
THREAD CLASS3A ALL ENDS A
SUBSTITUTES & CROSS-REFERENCES 4
SAE-AS18280Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
MS21916K8-6Reference document
Same NSN cross-reference
Reference document — Secondary reference
AS21916K8-6Reference document
Same NSN cross-reference
Reference document — Secondary reference
AS21916Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 157618300?
157618300 is a REDUCER,BOSS.
What parts can replace 157618300?
There are 4 known substitutes for 157618300: SAE-AS18280, MS21916K8-6, AS21916K8-6 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 157618300?
157618300 is cataloged in the U.S. Government catalog under NSN 4730-01-343-5447. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.