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Technical Data Sheet
PartsTable / COMPONENT / ST48D55-3
ST48D55-3 ✓ 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 COUPLING HALF,QUICK DISCONNECT is a the manufacturer industrial component. Key specifications include material: STEEL BODY, overall_length: 2.188 INCHES NOMINAL IN, connection_type: INTERNAL QUICK DISCONNECT ALL ENDS, connection_style: PLAIN ALL ENDS, style_designator: MALE COUPLING HALF, features_provided: SELF-SEALING. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-235-8546, 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
ST48D55-3
NSN: 4730-01-235-8546
FSC: 4730
CAGE: 04236 — LOCKHEED MARTIN CORP (USA)
SPECIFICATIONS
materialSTEEL BODY
overall_length2.188 INCHES NOMINAL IN
connection_typeINTERNAL QUICK DISCONNECT ALL ENDS
connection_stylePLAIN ALL ENDS
style_designatorMALE COUPLING HALF
features_providedSELF-SEALING
surface_treatmentOXIDE BODY
nominal_thread_size1.000 INCHES ALL ENDS IN
quick_disconnect_methodPUSH-PULL ALL ENDS
thread_series_designatorNPT ALL ENDS
quick_disconnect_nominal_size1.000 INCHES ALL ENDS IN
material_document_and_classificationFED-STD-66 FED STD SINGLE MATERIAL RESPONSE BODY
NSN4730-01-235-8546
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: ST48D55-3 · 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
•
QUICK DISCONNECT NOMINAL SIZE: 1.000 INCHES ALL ENDS IN
•
CONNECTION TYPE: INTERNAL QUICK DISCONNECT ALL ENDS
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-C-13924 MIL SPEC SINGLE TREATMENT RESPONSE BODY
•
FEATURES PROVIDED: SELF-SEALING
•
SURFACE TREATMENT: OXIDE BODY
•
NOMINAL THREAD SIZE: 1.000 INCHES ALL ENDS IN
•
QUICK DISCONNECT METHOD: PUSH-PULL ALL ENDS
•
THREAD SERIES DESIGNATOR: NPT ALL ENDS
TECHNICAL CHARACTERISTICS (FLIS)
QUICK DISCONNECT NOMINAL SIZE1.000 INCHES ALL ENDS IN
CONNECTION TYPEINTERNAL QUICK DISCONNECT ALL ENDS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-C-13924 MIL SPEC SINGLE TREATMENT RESPONSE BODY
FEATURES PROVIDEDSELF-SEALING
SURFACE TREATMENTOXIDE BODY
NOMINAL THREAD SIZE1.000 INCHES ALL ENDS IN
QUICK DISCONNECT METHODPUSH-PULL ALL ENDS
THREAD SERIES DESIGNATORNPT ALL ENDS
CONNECTION STYLEPLAIN ALL ENDS
MATERIALSTEEL BODY
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
6511185Interchangeable
interchangeable cross-reference
interchangeable
91594521Interchangeable
interchangeable cross-reference
interchangeable
851A313PK-005Interchangeable
interchangeable cross-reference
interchangeable
ST48D55-4Interchangeable
interchangeable cross-reference
interchangeable
H8F8Interchangeable
interchangeable cross-reference
interchangeable
ST48D55Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is ST48D55-3?
ST48D55-3 is a COUPLING HALF,QUICK DISCONNECT.
What parts can replace ST48D55-3?
There are 7 known substitutes for ST48D55-3: 6511185, 91594521, 851A313PK-005 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for ST48D55-3?
ST48D55-3 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-235-8546. 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