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Technical Data Sheet
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157D4 ✓ 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 FERRULE,BRAZING,TUBE FITTING is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY, seat_radius: 0.422 INCHES NOMINAL IN, flange_width: 0.188 INCHES NOMINAL IN, overall_length: 1.094 INCHES NOMINAL IN, style_designator: COMPRESSION, flange_face_diameter: 0.453 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-278-0656, 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
157D4
NSN: 4730-00-278-0656
FSC: 4730
CAGE: 0AHP5 — CURTISS-WRIGHT CONTROLS, INC. DIV ACTUATION DIVISION (USA)
SPECIFICATIONS
materialCOPPER ALLOY
seat_radius0.422 INCHES NOMINAL IN
flange_width0.188 INCHES NOMINAL IN
overall_length1.094 INCHES NOMINAL IN
style_designatorCOMPRESSION
flange_face_diameter0.453 INCHES NOMINAL IN
flange_inside_diameter0.406 INCHES NOMINAL IN
casehardening_indicatorNOT CASEHARDENED
flange_outside_diameter0.672 INCHES NOMINAL IN
sleeve_outside_diameter0.594 INCHES NOMINAL IN
hose/tube_outside_diameter_for_which_designed0.500 INCHES NOMINAL IN
distance_from_flanged_end_to_tubing_clearance_hole0.250 INCHES NOMINAL IN
NSN4730-00-278-0656
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 157D4 · 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
•
FLANGE OUTSIDE DIAMETER: 0.672 INCHES NOMINAL IN
•
SEAT RADIUS: 0.422 INCHES NOMINAL IN
•
FLANGE INSIDE DIAMETER: 0.406 INCHES NOMINAL IN
•
STYLE DESIGNATOR: COMPRESSION
•
FLANGE FACE DIAMETER: 0.453 INCHES NOMINAL IN
•
SLEEVE OUTSIDE DIAMETER: 0.594 INCHES NOMINAL IN
•
DISTANCE FROM FLANGED END TO TUBING CLEARANCE HOLE: 0.250 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL LENGTH1.094 INCHES NOMINAL IN
FLANGE OUTSIDE DIAMETER0.672 INCHES NOMINAL IN
SEAT RADIUS0.422 INCHES NOMINAL IN
FLANGE INSIDE DIAMETER0.406 INCHES NOMINAL IN
STYLE DESIGNATORCOMPRESSION
FLANGE FACE DIAMETER0.453 INCHES NOMINAL IN
SLEEVE OUTSIDE DIAMETER0.594 INCHES NOMINAL IN
DISTANCE FROM FLANGED END TO TUBING CLEARANCE HOLE0.250 INCHES NOMINAL IN
FLANGE WIDTH0.188 INCHES NOMINAL IN
HOSE/TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED0.500 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 32
D150S4Interchangeable
interchangeable cross-reference
interchangeable
1022-2D4Interchangeable
interchangeable cross-reference
interchangeable
10073Interchangeable
interchangeable cross-reference
interchangeable
A630760G10Interchangeable
interchangeable cross-reference
interchangeable
100PLInterchangeable
interchangeable cross-reference
interchangeable
1022-1D2Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 157D4?
157D4 is a FERRULE,BRAZING,TUBE FITTING.
What parts can replace 157D4?
There are 32 known substitutes for 157D4: D150S4, 1022-2D4, 10073 and 29 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 157D4?
157D4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-278-0656. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026