PartsTable
Technical Data Sheet
120399 ✓ Verified by PartsTable
· NUT WASHER
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

The BATTERY MONITOR 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 OVERALL, nut_style: SQUARE, nut_height: 0.208 INCHES MINIMUM AND 0.225 INCHES MAXIMUM IN, thread_class: 2B, thread_series: UNIFIED NATIONAL COARSE (UNC), thread_direction: RIGHT-HAND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-012-0399, 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
120399
NSN: 5310-00-012-0399
FSC: 5310
CAGE: 18876 — US ARMY AVIATION AND MISSILE COMMAND (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleSQUARE
nut_height0.208 INCHES MINIMUM AND 0.225 INCHES MAXIMUM IN
thread_class2B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OR ZINC OVERALL
width_across_flats0.545 INCHES MINIMUM AND 0.5625 INCHES MAXIMUM IN
nominal_thread_size0.312 INCHES IN
bearing_surface_typeFLAT
end_item_identificationREFRIGERATOR, BLOOD
thread_quantity_per_inch18
NSN5310-00-012-0399
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 120399 · 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
THREAD CLASS: 2B
WIDTH ACROSS FLATS: 0.545 INCHES MINIMUM AND 0.5625 INCHES MAXIMUM IN
NOMINAL THREAD SIZE: 0.312 INCHES IN
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
BEARING SURFACE TYPE: FLAT
THREAD QUANTITY PER INCH: 18
THREAD DIRECTION: RIGHT-HAND
MATERIAL: STEEL 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 (FLIS)
THREAD CLASS2B
WIDTH ACROSS FLATS0.545 INCHES MINIMUM AND 0.5625 INCHES MAXIMUM IN
NOMINAL THREAD SIZE0.312 INCHES IN
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
BEARING SURFACE TYPEFLAT
THREAD QUANTITY PER INCH18
THREAD DIRECTIONRIGHT-HAND
MATERIALSTEEL OVERALL
SURFACE TREATMENTCADMIUM OR ZINC OVERALL
NUT HEIGHT0.208 INCHES MINIMUM AND 0.225 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
MILB933TYPEBInterchangeable
interchangeable cross-reference
interchangeable
34141SInterchangeable
interchangeable cross-reference
interchangeable
103102Interchangeable
interchangeable cross-reference
interchangeable
FF-N-836E TYPE 1 STYLE 3Interchangeable
interchangeable cross-reference
interchangeable
103104Interchangeable
interchangeable cross-reference
interchangeable
103105Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 120399?
120399 is a BATTERY MONITOR.
What parts can replace 120399?
There are 20 known substitutes for 120399: MILB933TYPEB, 34141S, 103102 and 17 more. Substitute compatibility should be verified for your specific system.
Is 120399 still available?
120399 is currently cancelled.
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