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Technical Data Sheet
PartsTable / MRO / 4-581
4-581 ✓ Verified by PartsTable
— · MRO · MRO_GENERAL
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

CAPACITOR,VARIABLE,AIR DIELECTRI. Key specifications include end_item_identification: DECENTRALIZED AUTOMATED SERVICE SUPPORT SYSTEM (DAS-3) AN/MYQ-4/4A A. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-388-0811, 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→ 4-581
NSN: 5310-00-388-0811
FSC: 5310
CAGE: 38151 — MARATHON ELECTRIC, LLC (USA)
SPECIFICATIONS
end_item_identificationDECENTRALIZED AUTOMATED SERVICE SUPPORT SYSTEM (DAS-3) AN/MYQ-4/4A A
NSN5310-00-388-0811
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 4-581 · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
EXTERNAL KEYWAY QUANTITY: 1
•
EXTERNAL KEYWAY WIDTH: 0.436 INCHES NOMINAL IN
•
EXTERNAL KEYWAY LENGTH: 0.218 INCHES NOMINAL IN
•
OUTSIDE DIAMETER: 1.838 INCHES MINIMUM AND 1.843 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.0239 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
•
HOLE DIAMETER: 0.812 INCHES MINIMUM AND 0.817 INCHES MAXIMUM IN
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)
EXTERNAL KEYWAY QUANTITY1
EXTERNAL KEYWAY WIDTH0.436 INCHES NOMINAL IN
SPECIAL FEATURESFORMED GROOVE AND NOTCH 180 DEGREES OPPOSIT KEYWAY
EXTERNAL KEYWAY LENGTH0.218 INCHES NOMINAL IN
OUTSIDE DIAMETER1.838 INCHES MINIMUM AND 1.843 INCHES MAXIMUM IN
MATERIAL THICKNESS0.0239 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
HOLE DIAMETER0.812 INCHES MINIMUM AND 0.817 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
13216E7149Interchangeable
interchangeable cross-reference
interchangeable
4581Interchangeable
interchangeable cross-reference
interchangeable
BE01760-001Interchangeable
interchangeable cross-reference
interchangeable
SY20300Interchangeable
interchangeable cross-reference
interchangeable
SY20307Interchangeable
interchangeable cross-reference
interchangeable
5257Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4-581?
4-581 is a CAPACITOR,VARIABLE,AIR DIELECTRI. It is classified as a MRO (MRO_GENERAL).
What parts can replace 4-581?
There are 11 known substitutes for 4-581: 13216E7149, 4581, BE01760-001 and 8 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4-581?
4-581 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-388-0811. 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