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R657 PIECE 58 — CUP,GREASE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

R657 PIECE 58: CUP,GREASE.

The CUP,GREASE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, special_features: E/I 1 1/2X2 IN.CV-6 PUMP. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-291-5259, 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
R657 PIECE 58
NSN: 4730-01-291-5259
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 63857 — CIRCOR NAVAL SOLUTIONS LLC DBA WARREN PUMPS (USA)
SPECIFICATIONS
materialSTEEL OVERALL
special_featuresE/I 1 1/2X2 IN.CV-6 PUMP
NSN4730-01-291-5259
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: R657 PIECE 58 · 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: STEEL OVERALL
TECHNICAL CHARACTERISTICS
SPECIAL FEATURESE/I 1 1/2X2 IN.CV-6 PUMP
MATERIALSTEEL OVERALL
SUBSTITUTES & CROSS-REFERENCES 1
GA7004Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is R657 PIECE 58?
R657 PIECE 58 is a CUP,GREASE.
What parts can replace R657 PIECE 58?
There is 1 known substitute for R657 PIECE 58: GA7004. Substitute compatibility should be verified for your specific system.
What is the NSN for R657 PIECE 58?
R657 PIECE 58 is cataloged in the U.S. Government catalog under NSN 4730-01-291-5259. 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.