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12Z7903-1050 — BOOT,DUST AND MOISTURE SEAL

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

12Z7903-1050: BOOT,DUST AND MOISTURE SEAL.

The BOOT,DUST AND MOISTURE SEAL is a the manufacturer industrial component. Key specifications include material: RUBBER SYNTHETIC BODY, overall_height: 0.422 INCHES NOMINAL IN, sealing_method: COMPRESSION, mounting_method: INTEGRAL THREADED NUT, style_designator: CLOSED END, width_across_flats: 0.750 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-583-8553, 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
12Z7903-1050
NSN: 5340-00-583-8553
FSC: 5340 — Hardware, Commercial
CAGE: 94135 — NAVAL ORDNANCE STANDARDS (USA)
SPECIFICATIONS
materialRUBBER SYNTHETIC BODY
overall_height0.422 INCHES NOMINAL IN
sealing_methodCOMPRESSION
mounting_methodINTEGRAL THREADED NUT
style_designatorCLOSED END
width_across_flats0.750 INCHES NOMINAL IN
opening_inside_diameter0.420 INCHES NOMINAL IN
mounting_device_quantity1
NSN5340-00-583-8553
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 12Z7903-1050 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
•
WIDTH ACROSS FLATS: 0.750 INCHES NOMINAL IN
•
SEALING METHOD: COMPRESSION
•
OPENING INSIDE DIAMETER: 0.420 INCHES NOMINAL IN
•
MOUNTING METHOD: INTEGRAL THREADED NUT
•
STYLE DESIGNATOR: CLOSED END
•
MOUNTING DEVICE QUANTITY: 1
•
MATERIAL: RUBBER SYNTHETIC BODY
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.422 INCHES NOMINAL IN
WIDTH ACROSS FLATS0.750 INCHES NOMINAL IN
SEALING METHODCOMPRESSION
OPENING INSIDE DIAMETER0.420 INCHES NOMINAL IN
MOUNTING METHODINTEGRAL THREADED NUT
STYLE DESIGNATORCLOSED END
MOUNTING DEVICE QUANTITY1
MATERIALRUBBER SYNTHETIC BODY
OTHER ITEMS IN FSC 5340 — Hardware, Commercial
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5340-00-000-0068 5340-00-000-0132 5340-00-000-8150 5340-00-001-1251 5340-00-001-1264 5340-00-001-1265 5340-00-001-1266 5340-00-001-1275
SUBSTITUTES & CROSS-REFERENCES 1
G221750PC4Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — stock exhausted; no further procurementNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 12Z7903-1050?
12Z7903-1050 is a BOOT,DUST AND MOISTURE SEAL.
What parts can replace 12Z7903-1050?
There is 1 known substitute for 12Z7903-1050: G221750PC4. Substitute compatibility should be verified for your specific system.
What is the NSN for 12Z7903-1050?
12Z7903-1050 is cataloged in the U.S. Government catalog under NSN 5340-00-583-8553. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.