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Technical Data Sheet
MILB19257ASTYLE1 ✓ 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, overall_height: 0.875 INCHES NOMINAL IN, style_designator: CLOSED END, base_inside_diameter: 0.125 INCHES NOMINAL IN, base_outside_diameter: 0.750 INCHES NOMINAL IN, hazardous_locations/environmental_protection: DUSTTIGHT-NEMA TYPE 5 AND WATERTIGHT, MIL-B-5423. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-755-3645, 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
MILB19257ASTYLE1
NSN: 5340-00-755-3645
FSC: 5340
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialRUBBER SILICONE BODY
overall_height0.875 INCHES NOMINAL IN
style_designatorCLOSED END
base_inside_diameter0.125 INCHES NOMINAL IN
base_outside_diameter0.750 INCHES NOMINAL IN
hazardous_locations/environmental_protectionDUSTTIGHT-NEMA TYPE 5 AND WATERTIGHT, MIL-B-5423
NSN5340-00-755-3645
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MILB19257ASTYLE1 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
MATERIAL: RUBBER SILICONE BODY
HAZARDOUS LOCATIONS/ENVIRONMENTAL PROTECTION: DUSTTIGHT-NEMA TYPE 5 AND WATERTIGHT, MIL-B-5423
BASE OUTSIDE DIAMETER: 0.750 INCHES NOMINAL IN
BASE INSIDE DIAMETER: 0.125 INCHES NOMINAL IN
STYLE DESIGNATOR: CLOSED END
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALRUBBER SILICONE BODY
HAZARDOUS LOCATIONS/ENVIRONMENTAL PROTECTIONDUSTTIGHT-NEMA TYPE 5 AND WATERTIGHT, MIL-B-5423
BASE OUTSIDE DIAMETER0.750 INCHES NOMINAL IN
BASE INSIDE DIAMETER0.125 INCHES NOMINAL IN
STYLE DESIGNATORCLOSED END
OVERALL HEIGHT0.875 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
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 MILB19257ASTYLE1?
MILB19257ASTYLE1 is a BOOT,DUST AND MOISTURE SEAL.
What parts can replace MILB19257ASTYLE1?
There are 19 known substitutes for MILB19257ASTYLE1: F59260, NC3030, MIL-DTL-5423/7 and 16 more. Substitute compatibility should be verified for your specific system.
What is the NSN for MILB19257ASTYLE1?
MILB19257ASTYLE1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-755-3645. This indicates validated use in U.S. government and defense supply chains.
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