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Technical Data Sheet
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C-311 — Technical Data Sheet

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— · 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,FIXED,PAPER DIELECTRIC. Key specifications include diameter: 0.099 INCHES MINIMUM AND 0.103 INCHES MAXIMUM IN, material: STEEL OVERALL, body_style: W/MTG BRACKET, TERMINAL(S) ON ONE END, body_length: 1.875 INCHES NOMINAL IN, shank_style: PIN DRIVE, stud_length: 0.468 INCHES NOMINAL ALL THREADED STUD IN. This part is cataloged in the Federal Logistics Information System under NSN 5315-00-058-9731, 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→ C-311
NSN: 5315-00-058-9731
FSC: 5315
CAGE: D9182 — ZF INDUSTRIEANTRIEBE WITTEN GMBH (DEU)
SPECIFICATIONS
diameter0.099 INCHES MINIMUM AND 0.103 INCHES MAXIMUM IN
materialSTEEL OVERALL
body_styleW/MTG BRACKET, TERMINAL(S) ON ONE END
body_length1.875 INCHES NOMINAL IN
shank_stylePIN DRIVE
stud_length0.468 INCHES NOMINAL ALL THREADED STUD IN
thread_size0.312-18UNC-2A ALL THREADED PORTIONS A
body_diameter0.675 INCHES NOMINAL IN
bore_diameter2.7500 INCHES NOMINAL IN
overall_width1.9375 INCHES NOMINAL IN
flute_quantity4
overall_length0.500 INCHES NOMINAL IN
NSN5315-00-058-9731
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: C-311 · 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
•
MATERIAL THICKNESS: 0.022 INCHES NOMINAL IN
•
HARDNESS RATING: 43.0 ROCKWELL C MINIMUM AND 52.0 ROCKWELL C MAXIMUM OVERALL
•
STYLE DESIGNATOR: SLOTTED
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD ALL MATERIAL RESPONSES OVERALL
•
MATERIAL: STEEL COMP 410 OR STEEL COMP 420 OVERALL
•
SURFACE TREATMENT: PASSIVATE 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
MATERIAL THICKNESS0.022 INCHES NOMINAL IN
HARDNESS RATING43.0 ROCKWELL C MINIMUM AND 52.0 ROCKWELL C MAXIMUM OVERALL
OVERALL LENGTH0.485 INCHES MINIMUM AND 0.515 INCHES MAXIMUM IN
END ITEM IDENTIFICATIONW/S: SYSTEMS, JP-5 AVIATION FUELS; GUIDED MISSILE LAUNCHING SYSTEM, MK 26 (GMLS); RADAR SET, AN/PPS-5B; MISSILE, AIR INTERCEPT, SIDEWINDER (AIM-9); TRAFFIC JAM, AN/TLQ-17A; AIRCRAFT, (AC-130H, MC-130H, EC-130E, HC-130); SUPPORT EQUIPMENT, B-1 AIRCRAFT; TEST CONSOLES, MINI-SACE; MISSILE, AIR-TO-AIR, SPARROW (AIM-7) A
STYLE DESIGNATORSLOTTED
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD ALL MATERIAL RESPONSES OVERALL
MATERIALSTEEL COMP 410 OR STEEL COMP 420 OVERALL
SURFACE TREATMENTPASSIVATE OVERALL
SHEAR STRENGTH1000 DOUBLE POUND
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONASTM A380 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
131182InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
25704-281210-41-0InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
MS35337-23InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
140951InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
829948InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
A26884-9-7InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLEDGOVERNMENT REGISTRY
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is C-311?
C-311 is a CAPACITOR,FIXED,PAPER DIELECTRIC. It is classified as a MRO (MRO_GENERAL).
What parts can replace C-311?
There are 21 known substitutes for C-311: 131182, 25704-281210-41-0, MS35337-23 and 18 more. Substitute compatibility should be verified for your specific system.
Is C-311 still available?
C-311 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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Last verified: October 2026