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M3173-2011 PIECE 4 — NUT,UNION

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

M3173-2011 PIECE 4: NUT,UNION.

The NUT,UNION is a the manufacturer industrial component. Key specifications include material: STEEL COMP 304 OVERALL, criticality_code_justification: ZZZY, reference_number_differentiating_characteristics: QUALITY CONTROLLED IAW NAVY LEVEL 1 ASSURANCE GUIDE,CLEANED IAW MIL-C-52211. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-358-3957, 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
M3173-2011 PIECE 4
NSN: 4730-01-358-3957
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 0ASY6 — DERBYSHIRE MARINE PRODUCTS, LLC DBA DERBYSHIRE MARINE PRODUCTS LLC (USA)
SPECIFICATIONS
materialSTEEL COMP 304 OVERALL
criticality_code_justificationZZZY
reference_number_differentiating_characteristicsQUALITY CONTROLLED IAW NAVY LEVEL 1 ASSURANCE GUIDE,CLEANED IAW MIL-C-52211
NSN4730-01-358-3957
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: M3173-2011 PIECE 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
•
CRITICALITY CODE JUSTIFICATION: ZZZY
•
MATERIAL: STEEL COMP 304 OVERALL
•
REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICS: QUALITY CONTROLLED IAW NAVY LEVEL 1 ASSURANCE GUIDE,CLEANED IAW MIL-C-52211
TECHNICAL CHARACTERISTICS
CRITICALITY CODE JUSTIFICATIONZZZY
MATERIALSTEEL COMP 304 OVERALL
REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICSQUALITY CONTROLLED IAW NAVY LEVEL 1 ASSURANCE GUIDE,CLEANED IAW MIL-C-52211
SUBSTITUTES & CROSS-REFERENCES 3
M3173-2011 PIECE 4C1Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
M2158-CDC1Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
M2158-CDReference document
Same NSN cross-reference
Reference document — Design control — primary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is M3173-2011 PIECE 4?
M3173-2011 PIECE 4 is a NUT,UNION.
What parts can replace M3173-2011 PIECE 4?
There are 3 known substitutes for M3173-2011 PIECE 4: M3173-2011 PIECE 4C1, M2158-CDC1, M2158-CD. Substitute compatibility should be verified for your specific system.
What is the NSN for M3173-2011 PIECE 4?
M3173-2011 PIECE 4 is cataloged in the U.S. Government catalog under NSN 4730-01-358-3957. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.