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PartsTable / MRO / 401009
401009 ✓ Verified by PartsTable
Legrand · 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 material: STEEL COMP 2330 OR STEEL COMP 4130 OR STEEL COMP 8630 OVERALL, thickness: 0.0625 INCHES MINIMUM AND 0.0635 INCHES MAXIMUM IN, key_height: 0.104 INCHES MINIMUM AND 0.109 INCHES MAXIMUM IN, circle_diameter: 0.240 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN, hardness_rating: 40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL, style_designator: ROUND BOTTOM. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-616-5519, 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→ 401009
NSN: 5315-00-616-5519
FSC: 5315
CAGE: U3097 — PYSER SGI LIMITED (GBR)
SPECIFICATIONS
materialSTEEL COMP 2330 OR STEEL COMP 4130 OR STEEL COMP 8630 OVERALL
thickness0.0625 INCHES MINIMUM AND 0.0635 INCHES MAXIMUM IN
key_height0.104 INCHES MINIMUM AND 0.109 INCHES MAXIMUM IN
circle_diameter0.240 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
hardness_rating40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
style_designatorROUND BOTTOM
starting_edge_shapeSTRAIGHT
key_size_designationWOODRUFF 201
reliability_indicatorNOT ESTABLISHED
part_name_assigned_by_controlling_agencyBUSHING,RUBBER
NSN5315-00-616-5519
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 401009 · Legrand ⚠ 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
•
KEY SIZE DESIGNATION: WOODRUFF 201
•
KEY HEIGHT: 0.104 INCHES MINIMUM AND 0.109 INCHES MAXIMUM IN
•
HARDNESS RATING: 40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
•
STYLE DESIGNATOR: ROUND BOTTOM
•
STARTING EDGE SHAPE: STRAIGHT
•
MATERIAL: STEEL COMP 2330 OR STEEL COMP 4130 OR STEEL COMP 8630 OVERALL
•
CIRCLE DIAMETER: 0.240 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
•
THICKNESS: 0.0625 INCHES MINIMUM AND 0.0635 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 (FLIS)
KEY SIZE DESIGNATIONWOODRUFF 201
KEY HEIGHT0.104 INCHES MINIMUM AND 0.109 INCHES MAXIMUM IN
HARDNESS RATING40.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
STYLE DESIGNATORROUND BOTTOM
STARTING EDGE SHAPESTRAIGHT
MATERIALSTEEL COMP 2330 OR STEEL COMP 4130 OR STEEL COMP 8630 OVERALL
CIRCLE DIAMETER0.240 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
THICKNESS0.0625 INCHES MINIMUM AND 0.0635 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
403489Interchangeable
interchangeable cross-reference
interchangeable
401009Interchangeable
interchangeable cross-reference
interchangeable
FAH2852-30Interchangeable
interchangeable cross-reference
interchangeable
MS35756-1Interchangeable
Same NIIN cross-reference
interchangeable
5379379Interchangeable
Same NIIN cross-reference
interchangeable
16-X-128Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 401009?
401009 is a CAPACITOR,FIXED,PAPER DIELECTRIC manufactured by Legrand. It is classified as a MRO (MRO_GENERAL).
What parts can replace 401009?
There are 10 known substitutes for 401009: 403489, 401009, FAH2852-30 and 7 more. Substitute compatibility should be verified for your specific system.
Is 401009 still available?
401009 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