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A2057-C — PACKING NUT

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

A2057-C: PACKING NUT.

The PACKING NUT is a the manufacturer industrial component. Key specifications include diameter: 0.625 INCHES NOMINAL IN, material: COPPER ALLOY, construction: SEAMLESS, wall_thickness: 0.048 INCHES NOMINAL IN, first_end_style: PLAIN, cross-sectional_shape_style: PLAIN ROUND. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-595-1457, 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
A2057-C
NSN: 4730-00-595-1457
NIINs: 005951457, 012322356
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 53553 — AMETEK INC SCHUTTE AND KOERTING DIV (USA)
SPECIFICATIONS
diameter0.625 INCHES NOMINAL IN
materialCOPPER ALLOY
constructionSEAMLESS
wall_thickness0.048 INCHES NOMINAL IN
first_end_stylePLAIN
cross-sectional_shape_stylePLAIN ROUND
measuring_method_and_length50.125 INCHES NOMINAL SPECIFIC IN
material_document_and_classificationASTM B111, COMP 90-10 ASSN STD SINGLE MATERIAL RESPONSE
second_end_relationship_with_first_endIDENTICAL
NSN4730-00-595-1457
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: A2057-C · 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
•
HOLE OR SLOT QUANTITY: 2
•
THREAD LENGTH: 0.438 INCHES NOMINAL IN
•
STYLE DESIGNATOR: ROUND SLOTTED, EXTERNAL THREAD, BOSS
•
MATERIAL DOCUMENT AND CLASSIFICATION: WW-T-756,TYPE B FED SPEC SINGLE MATERIAL RESPONSE
•
THREAD DIRECTION: RIGHT-HAND
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
•
THREAD SIZE: 7/8IN-18 IN
TECHNICAL CHARACTERISTICS
HOLE OR SLOT QUANTITY2
THREAD LENGTH0.438 INCHES NOMINAL IN
STYLE DESIGNATORROUND SLOTTED, EXTERNAL THREAD, BOSS
MATERIAL DOCUMENT AND CLASSIFICATIONWW-T-756,TYPE B FED SPEC SINGLE MATERIAL RESPONSE
OVERALL LENGTH0.625 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
CASEHARDENING INDICATORNOT CASEHARDENED
THREAD SIZE7/8IN-18 IN
SCREW THREAD SERIES DESIGNATORUNS
THREAD CLASS3A A
SUBSTITUTES & CROSS-REFERENCES 2
A2057C PIECE 16Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
BB57-S46-037ALTReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is A2057-C?
A2057-C is a PACKING NUT.
What parts can replace A2057-C?
There are 2 known substitutes for A2057-C: A2057C PIECE 16, BB57-S46-037ALT. Substitute compatibility should be verified for your specific system.
What is the NSN for A2057-C?
A2057-C is cataloged in the U.S. Government catalog under NSN 4730-00-595-1457. 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.