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405056 — LOCKNUT,TUBE FITTING

✓ Government record, cited
3M · HOSE FITTING
PRODUCT OVERVIEW

405056: LOCKNUT,TUBE FITTING.

The LOCKNUT,TUBE FITTING is a 3M industrial component. Key specifications include material: COPPER ALLOY OVERALL, special_features: 2 1/2 GAL DESURGER, criticality_code_justification: ZZZY, material_document_and_classification: MIL-B-24059 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-295-8372, 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
405056
NSN: 4730-01-295-8372
NIINs: 012958372, 013107644
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 26337 — PARKER-HANNIFIN CORPORATION DIV HYDRAULIC ACCUMULATOR DIVISION (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
special_features2 1/2 GAL DESURGER
criticality_code_justificationZZZY
material_document_and_classificationMIL-B-24059 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
reference_number_differentiating_characteristicsQUALITY CONTROL IN ACCORDANCE WITH NAVSHIPS 0948-045-7010 MATERIAL IDENTIFICATION AND CONTROL INSTRUCTION FOR LEVEL 1 ITEMS
NSN4730-01-295-8372
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 405056 · 3M ⚠ 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
SUBSTITUTES & CROSS-REFERENCES 2
800398Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
800398PC10Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Semi-active item — no replacement plannedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 405056?
405056 is a LOCKNUT,TUBE FITTING manufactured by 3M.
What parts can replace 405056?
There are 2 known substitutes for 405056: 800398, 800398PC10. Substitute compatibility should be verified for your specific system.
What is the NSN for 405056?
405056 is cataloged in the U.S. Government catalog under NSN 4730-01-295-8372. 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.