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Technical Data Sheet
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Y21 — RING,SHOULDER

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

Y21: RING,SHOULDER.

The RING,SHOULDER is a the manufacturer industrial component. Key specifications include general_characteristics_item_description: STEEL,ONE END 2.500 IN. OD,COUNTERBORED 2.125 IN.

DIA,0.250 IN. DP,OTHER END 1.562 IN.ID,2.000 IN.OD,0.500 IN. O/A H IN.

This part is cataloged in the U.S. Government catalog under NSN 4320-00-674-4880, 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
Y21
NSN: 4320-00-674-4880
FSC: 4320 — Power and Hand Pumps
CAGE: 63857 — CIRCOR NAVAL SOLUTIONS LLC DBA WARREN PUMPS (USA)
SPECIFICATIONS
general_characteristics_item_descriptionSTEEL,ONE END 2.500 IN. OD,COUNTERBORED 2.125 IN. DIA,0.250 IN. DP,OTHER END 1.562 IN.ID,2.000 IN.OD,0.500 IN. O/A H IN
NSN4320-00-674-4880
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available RING,SHOULDER TITLE COMPONENT PN Y21 MFR RING,SHOULDER
KEY FEATURES
•
GENERAL CHARACTERISTICS ITEM DESCRIPTION: STEEL,ONE END 2.500 IN. OD,COUNTERBORED 2.125 IN. DIA,0.250 IN. DP,OTHER END 1.562 IN.ID,2.000 IN.OD,0.500 IN. O/A H IN
TECHNICAL CHARACTERISTICS
GENERAL CHARACTERISTICS ITEM DESCRIPTIONSTEEL,ONE END 2.500 IN. OD,COUNTERBORED 2.125 IN. DIA,0.250 IN. DP,OTHER END 1.562 IN.ID,2.000 IN.OD,0.500 IN. O/A H IN
OTHER ITEMS IN FSC 4320 — Power and Hand Pumps
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4320-00-001-1633 4320-00-001-2628 4320-00-001-2629 4320-00-001-2630 4320-00-001-2631 4320-00-001-2632 4320-00-001-3377 4320-00-001-3384
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is Y21?
Y21 is a RING,SHOULDER.
What is the NSN for Y21?
Y21 is cataloged in the U.S. Government catalog under NSN 4320-00-674-4880. 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.