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Technical Data Sheet
PartsTable / COMPONENT / 155-3/4
155-3/4 ✓ 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 155-3/4 is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-026-6503, 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
155-3/4
NSN: 4730-01-026-6503
FSC: 4730
CAGE: 34646 — ATI LADISH LLC DBA ATI WAH CHANG DIV ATI FORGED PRODUCTS - CUDAHY (USA)
SPECIFICATIONS
Part Number155-3/4
NSN4730-01-026-6503
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 155-3/4 · 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
•
NECK HEIGHT: 0.375 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A182,GRADE F11 ASSN STD SINGLE MATERIAL RESPONSE
•
SOCKET DIAMETER: 1.090 INCHES NOMINAL IN
•
FLANGE SECTION STYLE: RAISED FACE, SOCKET NECK
•
MATERIAL: STEEL
•
OPERATING PRESSURE AND TYPE: 1500.0 POUNDS PER SQUARE INCH (PSI) WATER MAXIMUM REQUIRED AND 1500.0 POUNDS PER SQUARE INCH (PSI) OIL MAXIMUM REQUIRED LOCATION NOT OTHERWISE SPECIFIED LBS
•
STYLE DESIGNATOR: ROUND, ONE BOLT HOLE CIRCLE
•
SOCKET DEPTH: 0.438 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
NECK HEIGHT0.375 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A182,GRADE F11 ASSN STD SINGLE MATERIAL RESPONSE
SOCKET DIAMETER1.090 INCHES NOMINAL IN
FLANGE SECTION STYLERAISED FACE, SOCKET NECK
MATERIALSTEEL
OPERATING PRESSURE AND TYPE1500.0 POUNDS PER SQUARE INCH (PSI) WATER MAXIMUM REQUIRED AND 1500.0 POUNDS PER SQUARE INCH (PSI) OIL MAXIMUM REQUIRED LOCATION NOT OTHERWISE SPECIFIED LBS
STYLE DESIGNATORROUND, ONE BOLT HOLE CIRCLE
SOCKET DEPTH0.438 INCHES NOMINAL IN
REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICSAS DIFFERENTIATED BY MATERIAL
FACE SEATING SURFACE CONDITIONGROUND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
15534Interchangeable
interchangeable cross-reference
interchangeable
EV692BInterchangeable
interchangeable cross-reference
interchangeable
15528AInterchangeable
interchangeable cross-reference
interchangeable
C149-202CInterchangeable
interchangeable cross-reference
interchangeable
CX111C002Interchangeable
interchangeable cross-reference
interchangeable
91964Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 155-3/4?
155-3/4 is a 155-3/4.
What parts can replace 155-3/4?
There are 19 known substitutes for 155-3/4: 15534, EV692B, 15528A and 16 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 155-3/4?
155-3/4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-026-6503. 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