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R2931 — BATTERY,STORAGE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

R2931: BATTERY,STORAGE.

The BATTERY,STORAGE 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 height: 0.438 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN, diameter: 1.487 INCHES MINIMUM AND 1.493 INCHES MAXIMUM IN, material: STEEL OVERALL, head_style: FLAT, chamfer_length: 0.438 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN, hardness_rating: 58.0 ROCKWELL C MINIMUM AND 62.0 ROCKWELL C MAXIMUM OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5315-00-235-0439, 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
R2931
NSN: 5315-00-235-0439
NIINs: 002350439, 013883584
FSC: 5315 — Nails, Machine Keys, and Pins
CAGE: 35311 — AMERICAN STANDARD INC WESTINGHOUSE AIR BRAKE CO DIV (USA)
SPECIFICATIONS
height0.438 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN
diameter1.487 INCHES MINIMUM AND 1.493 INCHES MAXIMUM IN
materialSTEEL OVERALL
head_styleFLAT
chamfer_length0.438 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN
hardness_rating58.0 ROCKWELL C MINIMUM AND 62.0 ROCKWELL C MAXIMUM OVERALL
style_designatorSTRAIGHT
voltage_in_volts7.5
features_providedCASEHARDENED
pin_chamfer_angle12.0 DEGREES MINIMUM AND 18.0 DEGREES MAXIMUM
pin_head_diameter1.750 INCHES NOMINAL IN
under_head_length3.875 INCHES NOMINAL IN
NSN5315-00-235-0439
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: R2931 · 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
•
CHAMFER LENGTH: 0.438 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN
•
HOLE ARRANGEMENT STYLE: ONE END DRILLED
•
UNDER HEAD LENGTH: 3.875 INCHES NOMINAL IN
•
PIN CHAMFER ANGLE: 12.0 DEGREES MINIMUM AND 18.0 DEGREES MAXIMUM
•
HARDNESS RATING: 58.0 ROCKWELL C MINIMUM AND 62.0 ROCKWELL C MAXIMUM OVERALL
•
STYLE DESIGNATOR: STRAIGHT
•
PIN HEAD DIAMETER: 1.750 INCHES NOMINAL IN
•
DIAMETER: 1.487 INCHES MINIMUM AND 1.493 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
CHAMFER LENGTH0.438 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN
HOLE ARRANGEMENT STYLEONE END DRILLED
UNDER HEAD LENGTH3.875 INCHES NOMINAL IN
PIN CHAMFER ANGLE12.0 DEGREES MINIMUM AND 18.0 DEGREES MAXIMUM
HARDNESS RATING58.0 ROCKWELL C MINIMUM AND 62.0 ROCKWELL C MAXIMUM OVERALL
STYLE DESIGNATORSTRAIGHT
PIN HEAD DIAMETER1.750 INCHES NOMINAL IN
DIAMETER1.487 INCHES MINIMUM AND 1.493 INCHES MAXIMUM IN
FEATURES PROVIDEDCASEHARDENED
HEAD STYLEFLAT
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is R2931?
R2931 is a BATTERY,STORAGE.
What is the NSN for R2931?
R2931 is cataloged in the U.S. Government catalog under NSN 5315-00-235-0439. 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.