PartsTable
Technical Data Sheet
Download PDF

A57-25 — INSERT,TUBE FITTING

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

A57-25: INSERT,TUBE FITTING.

The INSERT,TUBE FITTING is a the manufacturer industrial component. Key specifications include material: COTTON SINGLE WALL, face_width: 8.500 INCHES NOMINAL IN, overall_height: 16.500 INCHES NOMINAL IN, style_designator: FLAT, closure_fastening_type: STRING, environmental_protection: VAPOR. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-371-9574, 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
A57-25
NSN: 4730-00-371-9574
NIINs: 003719574, 005437837
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 55719 — IDSC HOLDINGS LLC DIV SNAP-ON INDUSTRIAL, A DIV. OF IDSC HOLDINGS , LLC (USA)
SPECIFICATIONS
materialCOTTON SINGLE WALL
face_width8.500 INCHES NOMINAL IN
overall_height16.500 INCHES NOMINAL IN
style_designatorFLAT
closure_fastening_typeSTRING
environmental_protectionVAPOR
surface_treatment_and_locationRESIN, SYNTHETIC SINGLE WALL EXTERNAL
NSN4730-00-371-9574
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: A57-25 · 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
•
STYLE DESIGNATOR: PLAIN
•
SLEEVE OUTSIDE DIAMETER: 0.550 INCHES NOMINAL IN
•
TUBE INSIDE DIAMETER FOR WHICH DESIGNED: 0.554 INCHES NOMINAL IN
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
•
MATERIAL: STEEL
•
FLANGE OUTSIDE DIAMETER: 0.684 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
STYLE DESIGNATORPLAIN
SLEEVE OUTSIDE DIAMETER0.550 INCHES NOMINAL IN
TUBE INSIDE DIAMETER FOR WHICH DESIGNED0.554 INCHES NOMINAL IN
CASEHARDENING INDICATORNOT CASEHARDENED
MATERIALSTEEL
FLANGE OUTSIDE DIAMETER0.684 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
Ready to buy A57-25?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is A57-25?
A57-25 is a INSERT,TUBE FITTING.
What is the NSN for A57-25?
A57-25 is cataloged in the U.S. Government catalog under NSN 4730-00-371-9574. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — A57-25

✓ 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.