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PartsTable / COMPONENT / 121B18
121B18 ✓ 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

CAPACITOR,FIXED,PAPER DIELECTRIC. Key specifications include material: COPPER ALLOY OVERALL, body_type: SOLID, head_type: SOLID, drive_end_style: HEXAGON, connection_style: PLAIN, thread_direction: RIGHT-HAND EXTERNAL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-013-8085, 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
121B18
NSN: 5315-00-013-8085
FSC: 5315
CAGE: 61208 — TWIN DISC, INCORPORATED DBA TWIN DISC MID-ATLANTIC (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
body_typeSOLID
head_typeSOLID
drive_end_styleHEXAGON
connection_stylePLAIN
thread_directionRIGHT-HAND EXTERNAL
nominal_thread_size0.125 INCHES EXTERNAL IN
end_item_identificationGRUMMAN A-10 AIRCRAFT; HIGH-MOBILITY ARTILLERY ROCKET SYSTEM (HIMARS)
thread_series_designatorNPTF EXTERNAL
nondefinitive_spec/std_data2A FIGURE A
specification/standard_data81343-J531 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
nominal_pipe_size_for_which_designed0.125 INCHES IN
NSN5315-00-013-8085
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 121B18 · 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
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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 28
42952Interchangeable
interchangeable cross-reference
interchangeable
39641Interchangeable
interchangeable cross-reference
interchangeable
SMD422740Interchangeable
interchangeable cross-reference
interchangeable
0206782-5Interchangeable
interchangeable cross-reference
interchangeable
356303SInterchangeable
interchangeable cross-reference
interchangeable
37564HAInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 121B18?
121B18 is a CAPACITOR,FIXED,PAPER DIELECTRIC.
What parts can replace 121B18?
There are 28 known substitutes for 121B18: 42952, 39641, SMD422740 and 25 more. Substitute compatibility should be verified for your specific system.
Is 121B18 still available?
121B18 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026