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Technical Data Sheet
PartsTable / MRO / 28-399
28-399 ✓ Verified by PartsTable
— · MRO · MRO_GENERAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

CAPACITOR,FIXED,MICA DIELECTRIC. Key specifications include material: STEEL CORROSION RESISTING, first_leg_angle: 90.0 DEGREES NOMINAL, first_leg_style: SQUARE, first_leg_width: 0.750 INCHES NOMINAL IN, first_leg_length: 1.500 INCHES NOMINAL IN, second_leg_style: SQUARE. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-140-3924, 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→ 28-399
NSN: 5340-00-140-3924
FSC: 5340
CAGE: 13841 — TIFFIN PARTS, L.L.C. DIV SUBSIDIARY OF PETTIBONE CORP. (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING
first_leg_angle90.0 DEGREES NOMINAL
first_leg_styleSQUARE
first_leg_width0.750 INCHES NOMINAL IN
first_leg_length1.500 INCHES NOMINAL IN
second_leg_styleSQUARE
second_leg_width0.750 INCHES NOMINAL IN
special_featuresOVERSEAS MRC 38.1MM MM
style_designatorANGLE
features_providedINTEGRAL DISK
second_leg_length4.500 INCHES NOMINAL IN
first_leg_thickness0.120 INCHES NOMINAL IN
NSN5340-00-140-3924
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 28-399 MFR: OEM ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
SECOND LEG DISTANCE FROM EDGE TO HOLE CENTER ALONG WIDTH: 0.500 INCHES NOMINAL IN
•
FIRST LEG STYLE: SQUARE
•
FIRST LEG DISTANCE FROM EDGE TO HOLE CENTER ALONG WIDTH: 0.500 INCHES NOMINAL IN
•
FIRST LEG HOLE DIAMETER: 0.344 INCHES NOMINAL IN
•
SECOND LEG STYLE: SQUARE
•
SECOND LEG WIDTH: 0.750 INCHES NOMINAL IN
•
FIRST LEG LENGTH: 1.500 INCHES NOMINAL IN
•
SECOND LEG HOLE DIAMETER: 0.344 INCHES NOMINAL 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)
SECOND LEG DISTANCE FROM EDGE TO HOLE CENTER ALONG WIDTH0.500 INCHES NOMINAL IN
FIRST LEG STYLESQUARE
FIRST LEG DISTANCE FROM EDGE TO HOLE CENTER ALONG WIDTH0.500 INCHES NOMINAL IN
FIRST LEG HOLE DIAMETER0.344 INCHES NOMINAL IN
SECOND LEG STYLESQUARE
SECOND LEG WIDTH0.750 INCHES NOMINAL IN
FIRST LEG LENGTH1.500 INCHES NOMINAL IN
SECOND LEG HOLE DIAMETER0.344 INCHES NOMINAL IN
SECOND LEG LENGTH4.500 INCHES NOMINAL IN
SECOND LEG HOLE ARRANGEMENT STYLEONE HOLE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
6S6-30VInterchangeable
interchangeable cross-reference
interchangeable
367-015-001Interchangeable
interchangeable cross-reference
interchangeable
3N5588Interchangeable
interchangeable cross-reference
interchangeable
28399Interchangeable
interchangeable cross-reference
interchangeable
323950Interchangeable
interchangeable cross-reference
interchangeable
9463NInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 28-399?
28-399 is a CAPACITOR,FIXED,MICA DIELECTRIC. It is classified as a MRO (MRO_GENERAL).
What parts can replace 28-399?
There are 11 known substitutes for 28-399: 6S6-30V, 367-015-001, 3N5588 and 8 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 28-399?
28-399 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-140-3924. 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