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Technical Data Sheet
MIL-C-5423 ✓ Verified by PartsTable
· ORING SEAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

The BOOT,DUST AND MOISTURE SEAL is a the manufacturer industrial component. Key specifications include material: RUBBER SILICONE BODY, thread_class: 2B, thread_length: 0.175 INCHES NOMINAL IN, thread_series: UNEF, overall_height: 0.243 INCHES NOMINAL IN, width_across_flats: 0.500 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 5340-00-841-1284, 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
MIL-C-5423
NSN: 5340-00-841-1284
FSC: 5340
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialRUBBER SILICONE BODY
thread_class2B
thread_length0.175 INCHES NOMINAL IN
thread_seriesUNEF
overall_height0.243 INCHES NOMINAL IN
width_across_flats0.500 INCHES NOMINAL IN
nominal_thread_size0.375 INCHES IN
base_thread_locationINTERNAL
thread_quantity_per_inch32
hazardous_locations/environmental_protectionDUSTTIGHT-NEMA TYPE 5 AND WATERTIGHT, MIL-B-5423
NSN5340-00-841-1284
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MIL-C-5423 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
THREAD LENGTH: 0.175 INCHES NOMINAL IN
BASE THREAD LOCATION: INTERNAL
HAZARDOUS LOCATIONS/ENVIRONMENTAL PROTECTION: DUSTTIGHT-NEMA TYPE 5 AND WATERTIGHT, MIL-B-5423
WIDTH ACROSS FLATS: 0.500 INCHES NOMINAL IN
THREAD QUANTITY PER INCH: 32
NOMINAL THREAD SIZE: 0.375 INCHES IN
THREAD SERIES: UNEF
TECHNICAL CHARACTERISTICS (FLIS)
THREAD LENGTH0.175 INCHES NOMINAL IN
OVERALL HEIGHT0.243 INCHES NOMINAL IN
BASE THREAD LOCATIONINTERNAL
HAZARDOUS LOCATIONS/ENVIRONMENTAL PROTECTIONDUSTTIGHT-NEMA TYPE 5 AND WATERTIGHT, MIL-B-5423
WIDTH ACROSS FLATS0.500 INCHES NOMINAL IN
THREAD QUANTITY PER INCH32
NOMINAL THREAD SIZE0.375 INCHES IN
THREAD SERIESUNEF
MATERIALRUBBER SILICONE BODY
THREAD CLASS2B
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
F59260Upgraded Successor
successor cross-reference
successor
NC3030Upgraded Successor
successor cross-reference
successor
MIL-DTL-5423/7Upgraded Successor
successor cross-reference
successor
MIL-B-5423Interchangeable
interchangeable cross-reference
interchangeable
9003273Interchangeable
interchangeable cross-reference
interchangeable
NC3030-REDInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MIL-C-5423?
MIL-C-5423 is a BOOT,DUST AND MOISTURE SEAL.
What parts can replace MIL-C-5423?
There are 18 known substitutes for MIL-C-5423: F59260, NC3030, MIL-DTL-5423/7 and 15 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MIL-C-5423?
MIL-C-5423 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-841-1284. This indicates validated use in U.S. government and defense supply chains.
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