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PartsTable / COMPONENT / X191
X191 ✓ 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 diameter: 0.116 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN, material: STEEL COMP E51100 OR STEEL COMP E52100 OVERALL, special_features: AFBMA STANDARD TOLERANCE FOR BALLS,GRADE 24, style_designator: BALL, underloop_length: 1.500 INCHES NOMINAL IN, rolling_element_diameter: 0.1250 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-010-3387, 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
X191
NSN: 5315-00-010-3387
FSC: 5315
CAGE: 78500 — MERITOR HEAVY VEHICLE SYSTEMS, LLC (USA)
SPECIFICATIONS
diameter0.116 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN
materialSTEEL COMP E51100 OR STEEL COMP E52100 OVERALL
special_featuresAFBMA STANDARD TOLERANCE FOR BALLS,GRADE 24
style_designatorBALL
underloop_length1.500 INCHES NOMINAL IN
rolling_element_diameter0.1250 INCHES NOMINAL IN
nondefinitive_spec/std_dataB TYPE AND 4 CLASS
material_document_and_classification66 FED STD ALL MATERIAL RESPONSES OVERALL
NSN5315-00-010-3387
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: X191 · 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 DOCUMENT AND CLASSIFICATION: 66 FED STD ALL MATERIAL RESPONSES OVERALL
•
STYLE DESIGNATOR: STANDARD
•
UNDERLOOP LENGTH: 1.500 INCHES NOMINAL IN
•
DIAMETER: 0.116 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN
•
NONDEFINITIVE SPEC/STD DATA: B TYPE AND 4 CLASS
•
MATERIAL: STEEL COMP 1008 OR STEEL COMP 1010 OR STEEL COMP 1012 OR STEEL COMP 1015 OR STEEL COMP 1017 OR STEEL COMP 1018 OR STEEL COMP 1020 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)
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD ALL MATERIAL RESPONSES OVERALL
STYLE DESIGNATORSTANDARD
UNDERLOOP LENGTH1.500 INCHES NOMINAL IN
DIAMETER0.116 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN
NONDEFINITIVE SPEC/STD DATAB TYPE AND 4 CLASS
MATERIALSTEEL COMP 1008 OR STEEL COMP 1010 OR STEEL COMP 1012 OR STEEL COMP 1015 OR STEEL COMP 1017 OR STEEL COMP 1018 OR STEEL COMP 1020 OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 26
P-212Interchangeable
interchangeable cross-reference
interchangeable
WWP471Interchangeable
interchangeable cross-reference
interchangeable
A-A-59616Interchangeable
interchangeable cross-reference
interchangeable
4361Interchangeable
interchangeable cross-reference
interchangeable
8039Interchangeable
interchangeable cross-reference
interchangeable
56020904Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is X191?
X191 is a CAPACITOR,FIXED,PAPER DIELECTRIC.
What parts can replace X191?
There are 26 known substitutes for X191: P-212, WWP471, A-A-59616 and 23 more. Substitute compatibility should be verified for your specific system.
What is the NSN for X191?
X191 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-010-3387. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026