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649731 — CAPACITOR,FIXED,ELECTROLYTIC

✓ Government record, cited
— · MRO · MRO_GENERAL
PRODUCT OVERVIEW

649731: CAPACITOR,FIXED,ELECTROLYTIC.

The CAPACITOR,FIXED,ELECTROLYTIC 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 1137 OVERALL, nut_style: DOUBLE HEXAGON, body_style: W/O MTG FACILITIES, TERMINAL(S) ON ONE END, body_length: 0.492 INCHES MAXIMUM IN, temp_rating: 550.0 FAHRENHEIT NOMINAL DEGF, thread_class: 3B. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-576-1531, 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→ 649731
NSN: 5310-00-576-1531
NIINs: 005761531, 007862535, 011103163, 015687382
FSC: 5310 — Nuts and Washers
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
materialSTEEL COMP 1137 OVERALL
nut_styleDOUBLE HEXAGON
body_styleW/O MTG FACILITIES, TERMINAL(S) ON ONE END
body_length0.492 INCHES MAXIMUM IN
temp_rating550.0 FAHRENHEIT NOMINAL DEGF
thread_class3B
body_diameter0.315 INCHES MAXIMUM IN
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
overall_height0.454 INCHES MINIMUM AND 0.469 INCHES MAXIMUM IN
locking_featurePREVAILING TORQUE ALL METAL DESIGN
terminal_length0.748 INCHES MINIMUM IN
special_featuresCONSISTS OF TRANSDUCER, 6 INCH NOMINAL CABLE AND 9 PIN CONNECTOR, USED ON AN/AAR-44A SYSTEM A
NSN5310-00-576-1531
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 649731 · 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
•
WASHER OUTSIDE DIAMETER: 0.598 INCHES MAXIMUM IN
•
WIDTH ACROSS FLATS: 0.492 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 1,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)
•
TEMP RATING: 550.0 FAHRENHEIT NOMINAL DEGF
•
WASHER THICKNESS: 0.080 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: AISI1137 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5024 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
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
OVERALL HEIGHT0.454 INCHES MINIMUM AND 0.469 INCHES MAXIMUM IN
WASHER OUTSIDE DIAMETER0.598 INCHES MAXIMUM IN
WIDTH ACROSS FLATS0.492 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 1,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)
TEMP RATING550.0 FAHRENHEIT NOMINAL DEGF
WASHER THICKNESS0.080 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONAISI1137 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5024 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.375 INCHES IN
SUBSTITUTES & CROSS-REFERENCES 6
6739971-064Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
52Z1835-064Reference document
Same NSN cross-reference
Reference document — Secondary reference
318659Reference document
Same NSN cross-reference
Reference document — Secondary reference
649727Reference document
Same NSN cross-reference
Reference document — Secondary reference
69416-624Reference document
Same NSN cross-reference
Reference document — Secondary reference
649724Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 649731?
649731 is a CAPACITOR,FIXED,ELECTROLYTIC. It is classified as a MRO (MRO_GENERAL).
What parts can replace 649731?
There are 6 known substitutes for 649731: 6739971-064, 52Z1835-064, 318659 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 649731?
649731 is cataloged in the U.S. Government catalog under NSN 5310-00-576-1531. 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.