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ST7M223D6 ✓ 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 LOCKNUT,TUBE FITTING is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY OVERALL, nut_style: TUBE FITTING LOCKNUT, nut_height: 0.244 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN, thread_class: 3B, thread_series: UNJS, thread_direction: RIGHT-HAND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-040-0951, 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
ST7M223D6
NSN: 4730-01-040-0951
FSC: 4730
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)
SPECIFICATIONS
materialALUMINUM ALLOY OVERALL
nut_styleTUBE FITTING LOCKNUT
nut_height0.244 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN
thread_class3B
thread_seriesUNJS
thread_directionRIGHT-HAND
surface_treatmentANODIZE OVERALL
width_across_flats0.812 INCHES NOMINAL IN
nominal_thread_size0.562 INCHES IN
packing_recess_depth0.025 INCHES NOMINAL IN
packing_recess_diameter0.578 INCHES NOMINAL IN
thread_quantity_per_inch18
NSN4730-01-040-0951
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: ST7M223D6 · 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
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-225/6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
SURFACE TREATMENT: ANODIZE OVERALL
•
NOMINAL THREAD SIZE: 0.562 INCHES IN
•
THREAD DIRECTION: RIGHT-HAND
•
NUT HEIGHT: 0.244 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-A-8625,TYPE3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
WIDTH ACROSS FLATS: 0.812 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 18
TECHNICAL CHARACTERISTICS (FLIS)
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-225/6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
SURFACE TREATMENTANODIZE OVERALL
NOMINAL THREAD SIZE0.562 INCHES IN
THREAD DIRECTIONRIGHT-HAND
NUT HEIGHT0.244 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-A-8625,TYPE3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
WIDTH ACROSS FLATS0.812 INCHES NOMINAL IN
THREAD QUANTITY PER INCH18
THREAD SERIESUNJS
NUT STYLETUBE FITTING LOCKNUT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
CS14Interchangeable
interchangeable cross-reference
interchangeable
SMB540888Interchangeable
interchangeable cross-reference
interchangeable
652A567PC2Interchangeable
interchangeable cross-reference
interchangeable
10108492Interchangeable
Same NIIN cross-reference
interchangeable
ST7M223Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is ST7M223D6?
ST7M223D6 is a LOCKNUT,TUBE FITTING.
What parts can replace ST7M223D6?
There are 5 known substitutes for ST7M223D6: CS14, SMB540888, 652A567PC2 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for ST7M223D6?
ST7M223D6 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-040-0951. 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