PartsTable
Technical Data Sheet
ST57D115-3 ✓ 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,TUBE TO BOSS is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, seat_angle: 37.0 DEGREES FIRST END, thread_class: 2A ALL ENDS A, connection_type: THREADED EXTERNAL BOSS SECOND END, connection_style: EXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END, special_features: PROTECTIVE MALE THREAD COVERINGS AND FINISH TO BE PER CLARK SPEC 77F-C. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-968-5578, 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
ST57D115-3
NSN: 4730-00-968-5578
FSC: 4730
CAGE: 04236 — LOCKHEED MARTIN CORP (USA)
SPECIFICATIONS
materialSTEEL OVERALL
seat_angle37.0 DEGREES FIRST END
thread_class2A ALL ENDS A
connection_typeTHREADED EXTERNAL BOSS SECOND END
connection_styleEXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END
special_featuresPROTECTIVE MALE THREAD COVERINGS AND FINISH TO BE PER CLARK SPEC 77F-C
nominal_thread_size0.562 INCHES FIRST END IN
nominal_overall_length1.380 INCHES IN
end_item_identification3930013787497
thread_series_designatorUNF ALL ENDS
furnished_items_and_quantity1 PREFORMED PACKING
nominal_outside_diameter_tube_accommodated0.375 INCHES FIRST END IN
NSN4730-00-968-5578
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: ST57D115-3 · 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 TYPE: THREADED EXTERNAL TUBE FIRST END
NOMINAL OVERALL LENGTH: 1.375 INCHES IN
SPECIFICATION/STANDARD DATA: 96906-MS51525 GOVERNMENT STANDARD AND 81343-J514 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: J514 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
SEAT ANGLE: 37.0 DEGREES FIRST END
THREAD SERIES DESIGNATOR: UNF ALL ENDS
NOMINAL THREAD SIZE: 0.562 INCHES FIRST END IN
CONNECTION STYLE: EXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END
TECHNICAL CHARACTERISTICS (FLIS)
CONNECTION TYPETHREADED EXTERNAL TUBE FIRST END
NOMINAL OVERALL LENGTH1.375 INCHES IN
SPECIFICATION/STANDARD DATA96906-MS51525 GOVERNMENT STANDARD AND 81343-J514 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONJ514 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
SEAT ANGLE37.0 DEGREES FIRST END
THREAD SERIES DESIGNATORUNF ALL ENDS
NOMINAL THREAD SIZE0.562 INCHES FIRST END IN
CONNECTION STYLEEXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END
CONNECTION TYPETHREADED EXTERNAL BOSS SECOND END
THREAD CLASS2A ALL ENDS A
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
1021094Interchangeable
interchangeable cross-reference
interchangeable
C5706X6Interchangeable
interchangeable cross-reference
interchangeable
MS51523A6Interchangeable
interchangeable cross-reference
interchangeable
0921297-8Interchangeable
interchangeable cross-reference
interchangeable
A13893Interchangeable
interchangeable cross-reference
interchangeable
20060Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is ST57D115-3?
ST57D115-3 is a ADAPTER,STRAIGHT,TUBE TO BOSS.
What parts can replace ST57D115-3?
There are 20 known substitutes for ST57D115-3: 1021094, C5706X6, MS51523A6 and 17 more. Substitute compatibility should be verified for your specific system.
Is ST57D115-3 still available?
ST57D115-3 is currently cancelled.
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