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Technical Data Sheet
PartsTable / COMPONENT / D57
D57 ✓ 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

CONNECTOR,RECEPTACLE,ELECTRICAL. Key specifications include material: COPPER ALLOY 937 OVERALL, corner_shape: SQUARE OUTSIDE LEFT CORNER, flange_width: 0.2500 INCHES MINIMUM AND 0.2550 INCHES MAXIMUM IN, thread_class: 2A FIRST END A, overall_length: 3.9850 INCHES MINIMUM AND 3.9900 INCHES MAXIMUM IN, connection_type: THREADED EXTERNAL TUBE FIRST END. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-273-8561, 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
D57
NSN: 4730-00-273-8561
FSC: 4730
CAGE: 34193 — KOHLER AND CAMPBELL INC (USA)
SPECIFICATIONS
materialCOPPER ALLOY 937 OVERALL
corner_shapeSQUARE OUTSIDE LEFT CORNER
flange_width0.2500 INCHES MINIMUM AND 0.2550 INCHES MAXIMUM IN
thread_class2A FIRST END A
overall_length3.9850 INCHES MINIMUM AND 3.9900 INCHES MAXIMUM IN
connection_typeTHREADED EXTERNAL TUBE FIRST END
connection_stylePLAIN (PIPE) SECOND END
special_featuresSUPPORTS HARNISCHFEGER CORP.;MODEL M320T2,CRANE TRUCK MOUNTED,NSN 3810-00-151-4431
style_designatorSOLID, EXTERNAL FLANGE ONE END
operating_pressure400.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
nominal_thread_size0.562 INCHES FIRST END IN
seat_nominal_radius0.062 INCHES FIRST END IN
NSN4730-00-273-8561
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: D57 · 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 THREAD SIZE: 0.562 INCHES FIRST END IN
•
NOMINAL OVERALL LENGTH: 1.420 INCHES IN
•
OPERATING PRESSURE: 400.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
•
FURNISHED ITEMS AND QUANTITY: 1 SHORT COUPLING NUT WITH SLEEVE
•
MAXIMUM OPERATING TEMP: 250.0 FAHRENHEIT SINGLE RESPONSE DEGF
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.375 INCHES FIRST END IN
•
THREAD SERIES DESIGNATOR: NPTF SECOND END
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL THREAD SIZE0.562 INCHES FIRST END IN
SPECIAL FEATURESSUPPORTS HARNISCHFEGER CORP.;MODEL M320T2,CRANE TRUCK MOUNTED,NSN 3810-00-151-4431
NOMINAL OVERALL LENGTH1.420 INCHES IN
OPERATING PRESSURE400.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
FURNISHED ITEMS AND QUANTITY1 SHORT COUPLING NUT WITH SLEEVE
MAXIMUM OPERATING TEMP250.0 FAHRENHEIT SINGLE RESPONSE DEGF
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.375 INCHES FIRST END IN
THREAD SERIES DESIGNATORNPTF SECOND END
MATERIALCOPPER ALLOY 360 OR COPPER ALLOY OVERALL
CONNECTION STYLECOMPRESSION (TUBE) FIRST END
VERIFIED SUBSTITUTES & CROSS-REFERENCES 30
W68X7Interchangeable
interchangeable cross-reference
interchangeable
68F7-16X1-4Interchangeable
interchangeable cross-reference
interchangeable
140291Interchangeable
interchangeable cross-reference
interchangeable
SAE-J512Interchangeable
interchangeable cross-reference
interchangeable
453B120Interchangeable
interchangeable cross-reference
interchangeable
3299Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is D57?
D57 is a CONNECTOR,RECEPTACLE,ELECTRICAL.
What parts can replace D57?
There are 30 known substitutes for D57: W68X7, 68F7-16X1-4, 140291 and 27 more. Substitute compatibility should be verified for your specific system.
Is D57 still available?
D57 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