PartsTable
Technical Data Sheet
MIL-B-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 INSULATOR, base_width: 3.661 INCHES NOMINAL IN, dome_height: 0.281 INCHES MINIMUM IN, thread_class: 2B, thread_length: 0.160 INCHES NOMINAL IN, thread_series: UN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-535-9720, 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-B-5423
NSN: 5340-00-535-9720
FSC: 5340
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialRUBBER SILICONE INSULATOR
base_width3.661 INCHES NOMINAL IN
dome_height0.281 INCHES MINIMUM IN
thread_class2B
thread_length0.160 INCHES NOMINAL IN
thread_seriesUN
overall_height0.239 INCHES NOMINAL IN
sealing_methodMECHANICAL
mounting_methodBUSHING
special_featuresWEAPON SYSTEM ESSENTIAL
style_designatorTHRU-HOLE
width_across_flats0.500 INCHES NOMINAL IN
NSN5340-00-535-9720
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MIL-B-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
MOUNTING METHOD: THREAD
OPENING INSIDE DIAMETER: 0.109 INCHES NOMINAL IN
STYLE DESIGNATOR: THRU-HOLE
MATERIAL: RUBBER SILICONE BODY
BASE THREAD LOCATION: INTERNAL
THREAD SERIES: UNS
THREAD CLASS: 2B
TECHNICAL CHARACTERISTICS (FLIS)
MOUNTING METHODTHREAD
OPENING INSIDE DIAMETER0.109 INCHES NOMINAL IN
STYLE DESIGNATORTHRU-HOLE
MATERIALRUBBER SILICONE BODY
BASE THREAD LOCATIONINTERNAL
THREAD SERIESUNS
OVERALL HEIGHT0.531 INCHES NOMINAL IN
THREAD CLASS2B
WIDTH ACROSS FLATS0.750 INCHES NOMINAL IN
SPECIAL FEATURESBOOT BONDED TO NICKEL PLATED BRASS NUT,RESISTANT TO SALT WATER MINUS 90 DEG C TO PLUS 260 DEG C TEMP RANGE DEGC
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
F59260Upgraded Successor
successor cross-reference
successor
NC3030Upgraded Successor
successor cross-reference
successor
MIL-DTL-5423/7Upgraded Successor
successor cross-reference
successor
NC3030-REDInterchangeable
interchangeable cross-reference
interchangeable
TYPEBSTYLE2SIZE1Interchangeable
interchangeable cross-reference
interchangeable
MILB19257Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MIL-B-5423?
MIL-B-5423 is a BOOT,DUST AND MOISTURE SEAL.
What parts can replace MIL-B-5423?
There are 20 known substitutes for MIL-B-5423: F59260, NC3030, MIL-DTL-5423/7 and 17 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MIL-B-5423?
MIL-B-5423 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-535-9720. This indicates validated use in U.S. government and defense supply chains.
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