PartsTable
Technical Data Sheet
PartsTable / MRO / 21-1709
21-1709 ✓ Verified by PartsTable
— · MRO · MRO_GENERAL
WHAT YOU NEED TO KNOW
2RS = sealed for life, ZZ = shielded re-greaseable ABEC grade: higher = tighter tolerance
ABEC-1 standard, ABEC-7+ for precision spindles
PRODUCT OVERVIEW

The CAPACITOR is a the manufacturer cache protection component designed to preserve data integrity during power loss events in enterprise server and storage controller environments. Key specifications include material: STEEL COMP 4130 OVERALL, corner_shape: SQUARE ALL CORNERS, overall_length: 0.3550 INCHES MINIMUM AND 0.3650 INCHES MAXIMUM IN, style_designator: SOLID, PLAIN, NO OUTSIDE FLANGES, surface_treatment: CADMIUM RIGHT END SURFACE OF BODY, body_inside_diameter: 0.3120 INCHES MINIMUM AND 0.3135 INCHES MAXIMUM IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-134-0221, 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
MRO→ MRO_GENERAL→ 21-1709
NSN: 3120-00-134-0221
FSC: 3120
CAGE: 81982 — HYDRO-AIRE AEROSPACE CORP (USA)
SPECIFICATIONS
materialSTEEL COMP 4130 OVERALL
corner_shapeSQUARE ALL CORNERS
overall_length0.3550 INCHES MINIMUM AND 0.3650 INCHES MAXIMUM IN
style_designatorSOLID, PLAIN, NO OUTSIDE FLANGES
surface_treatmentCADMIUM RIGHT END SURFACE OF BODY
body_inside_diameter0.3120 INCHES MINIMUM AND 0.3135 INCHES MAXIMUM IN
body_outside_diameter0.5005 INCHES MINIMUM AND 0.5010 INCHES MAXIMUM IN
NSN3120-00-134-0221
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: 21-1709 · OEM ⚠ VERIFY BEFORE ORDERING ABEC grade: higher = tighter tolerance = higher cost. ABEC-1 is standard, ABEC-7+ for precision spindles. Open, shielded (ZZ), and sealed (2RS) versions have different max RPM ratings ✓ BROKER TIP 2RS = sealed for life (no maintenance). ZZ = shielded, re-greaseable. Open = must lubricate on install. Common interchange: 6205-2RS = 6205-2RSR = 6205-DDU (same bearing, different suffix) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
BODY INSIDE DIAMETER: 0.3120 INCHES MINIMUM AND 0.3135 INCHES MAXIMUM IN
•
SURFACE TREATMENT: CADMIUM OUTSIDE DIAMETER SURFACE OF BODY
•
MATERIAL: STEEL COMP 4130 OVERALL
•
CORNER SHAPE: SQUARE ALL CORNERS
•
STYLE DESIGNATOR: SOLID, PLAIN, NO OUTSIDE FLANGES
TYPICAL APPLICATIONS
  • RAID cache protection during power loss events
  • Write-back cache enablement for storage controllers
  • Enterprise server data integrity assurance
  • Hot-swap battery/capacitor replacement in production
TECHNICAL CHARACTERISTICS (FLIS)
BODY INSIDE DIAMETER0.3120 INCHES MINIMUM AND 0.3135 INCHES MAXIMUM IN
SURFACE TREATMENTCADMIUM OUTSIDE DIAMETER SURFACE OF BODY
SURFACE TREATMENTCADMIUM LEFT END SURFACE OF BODY
MATERIALSTEEL COMP 4130 OVERALL
CORNER SHAPESQUARE ALL CORNERS
STYLE DESIGNATORSOLID, PLAIN, NO OUTSIDE FLANGES
SURFACE TREATMENTCADMIUM RIGHT END SURFACE OF BODY
OVERALL LENGTH0.3550 INCHES MINIMUM AND 0.3650 INCHES MAXIMUM IN
BODY OUTSIDE DIAMETER0.5005 INCHES MINIMUM AND 0.5010 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
211709Interchangeable
interchangeable cross-reference
interchangeable
21-1503Interchangeable
interchangeable cross-reference
interchangeable
831P100-3.9-0.5PF-50Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21-1709?
21-1709 is a CAPACITOR. It is classified as a MRO (MRO_GENERAL).
What parts can replace 21-1709?
There are 3 known substitutes for 21-1709: 211709, 21-1503, 831P100-3.9-0.5PF-50. Substitute compatibility should be verified for your specific system.
What is the NSN for 21-1709?
21-1709 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-134-0221. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026