PartsTable
Technical Data Sheet
A521 ✓ 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

CABLE,SPECIAL PURPOSE,ELECTRICAL. Key specifications include material: ALUMINUM ALLOY OVERALL, nut_style: ROUND, corner_shape: SQUARE ALL CORNERS, nut_diameter: 2.750 INCHES NOMINAL IN, thread_class: 2B, nut_thickness: 0.500 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3120-00-288-2798, 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 A521
NSN: 3120-00-288-2798
FSC: 3120
CAGE: 70417 — CHRYSLER CORP AMPLEX DIV (USA)
SPECIFICATIONS
materialALUMINUM ALLOY OVERALL
nut_styleROUND
corner_shapeSQUARE ALL CORNERS
nut_diameter2.750 INCHES NOMINAL IN
thread_class2B
nut_thickness0.500 INCHES NOMINAL IN
thread_seriesUNF
overall_length0.7450 INCHES MINIMUM AND 0.7550 INCHES MAXIMUM IN
style_designatorSOLID, PLAIN, NO OUTSIDE FLANGES
thread_directionRIGHT-HAND
drive_point_depth0.375 INCHES NOMINAL IN
nominal_thread_size1.500 INCHES IN
NSN3120-00-288-2798
COMPONENT DIAGRAM
BALL BEARING — SEAL TYPE DETERMINES MAINTENANCE OD: — · BORE: — · WIDTH: — SEAL: Open · PN: A521 · 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
STYLE DESIGNATOR: SOLID, PLAIN, NO OUTSIDE FLANGES
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-B-5697,TY 1,COMP A MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
CORNER SHAPE: SQUARE ALL CORNERS
NONDEFINITIVE SPEC/STD DATA: 1 TYPE AND A COMPOSITION
MATERIAL: OIL LUBRICATING LUBRICATION
BODY INSIDE DIAMETER: 0.3740 INCHES MINIMUM AND 0.3750 INCHES MAXIMUM IN
TYPICAL APPLICATIONS
  • Server Internal Cabling
  • Data Center Cable Infrastructure
  • SAS/SATA Drive Connectivity
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL LENGTH0.7450 INCHES MINIMUM AND 0.7550 INCHES MAXIMUM IN
STYLE DESIGNATORSOLID, PLAIN, NO OUTSIDE FLANGES
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-B-5697,TY 1,COMP A MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
CORNER SHAPESQUARE ALL CORNERS
NONDEFINITIVE SPEC/STD DATA1 TYPE AND A COMPOSITION
MATERIALOIL LUBRICATING LUBRICATION
MATERIALCOPPER ALLOY OVERALL
BODY INSIDE DIAMETER0.3740 INCHES MINIMUM AND 0.3750 INCHES MAXIMUM IN
BODY OUTSIDE DIAMETER0.5020 INCHES MINIMUM AND 0.5030 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 17
18710Interchangeable
interchangeable cross-reference
interchangeable
K12KITInterchangeable
interchangeable cross-reference
interchangeable
QUICKIEKITInterchangeable
interchangeable cross-reference
interchangeable
48G53Interchangeable
interchangeable cross-reference
interchangeable
WPP12242Interchangeable
interchangeable cross-reference
interchangeable
204AInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A521?
A521 is a CABLE,SPECIAL PURPOSE,ELECTRICAL. It is classified as a MRO (MRO_GENERAL).
What parts can replace A521?
There are 17 known substitutes for A521: 18710, K12KIT, QUICKIEKIT and 14 more. Substitute compatibility should be verified for your specific system.
Is A521 still available?
A521 is currently cancelled.
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