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280903-99 ✓ 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 GASKET is a the manufacturer industrial component. Key specifications include material: STEEL COMP 321 OVERALL, outside_diameter: 1.377 INCHES MINIMUM AND 1.383 INCHES MAXIMUM IN, style_designator: CIRCULAR, aperture_diameter: 1.169 INCHES MINIMUM AND 1.201 INCHES MAXIMUM IN, surface_treatment: SILVER OVERALL, cross-sectional_thickness: 0.095 INCHES MINIMUM AND 0.101 INCHES MAXIMUM 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 5330-01-017-1535, 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
280903-99
NSN: 5330-01-017-1535
FSC: 5330
CAGE: 99657 — MAROTTA CONTROLS INC (USA)
SPECIFICATIONS
materialSTEEL COMP 321 OVERALL
outside_diameter1.377 INCHES MINIMUM AND 1.383 INCHES MAXIMUM IN
style_designatorCIRCULAR
aperture_diameter1.169 INCHES MINIMUM AND 1.201 INCHES MAXIMUM IN
surface_treatmentSILVER OVERALL
special_test_featuresDRILL 4 VENT HOLES NO. 72 /0.025 IN. DIA/,LOCATED AT 90 DEGREE AROUND CIRCLE,2 HOLES ON EACH SIDE AT 180 DEGREES APART IN
cross-sectional_thickness0.095 INCHES MINIMUM AND 0.101 INCHES MAXIMUM IN
cross-sectional_shape_styleHOLLOW
material_document_and_classificationQQ-S-763,CL 321 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5330-01-017-1535
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 280903-99 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
•
SPECIAL TEST FEATURES: DRILL 4 VENT HOLES NO. 72 /0.025 IN. DIA/,LOCATED AT 90 DEGREE AROUND CIRCLE,2 HOLES ON EACH SIDE AT 180 DEGREES APART IN
•
STYLE DESIGNATOR: CIRCULAR
•
MATERIAL: STEEL COMP 321 OVERALL
•
CROSS-SECTIONAL THICKNESS: 0.095 INCHES MINIMUM AND 0.101 INCHES MAXIMUM IN
•
SURFACE TREATMENT: SILVER OVERALL
•
APERTURE DIAMETER: 1.169 INCHES MINIMUM AND 1.201 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 1.377 INCHES MINIMUM AND 1.383 INCHES MAXIMUM IN
•
CROSS-SECTIONAL SHAPE STYLE: HOLLOW
TECHNICAL CHARACTERISTICS (FLIS)
SPECIAL TEST FEATURESDRILL 4 VENT HOLES NO. 72 /0.025 IN. DIA/,LOCATED AT 90 DEGREE AROUND CIRCLE,2 HOLES ON EACH SIDE AT 180 DEGREES APART IN
STYLE DESIGNATORCIRCULAR
MATERIALSTEEL COMP 321 OVERALL
CROSS-SECTIONAL THICKNESS0.095 INCHES MINIMUM AND 0.101 INCHES MAXIMUM IN
SURFACE TREATMENTSILVER OVERALL
APERTURE DIAMETER1.169 INCHES MINIMUM AND 1.201 INCHES MAXIMUM IN
OUTSIDE DIAMETER1.377 INCHES MINIMUM AND 1.383 INCHES MAXIMUM IN
CROSS-SECTIONAL SHAPE STYLEHOLLOW
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-763,CL 321 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
2042-1Interchangeable
interchangeable cross-reference
interchangeable
X2042AInterchangeable
interchangeable cross-reference
interchangeable
245004Interchangeable
interchangeable cross-reference
interchangeable
RM611Interchangeable
interchangeable cross-reference
interchangeable
8513216Interchangeable
interchangeable cross-reference
interchangeable
AMES-2042-1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 280903-99?
280903-99 is a GASKET.
What parts can replace 280903-99?
There are 14 known substitutes for 280903-99: 2042-1, X2042A, 245004 and 11 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 280903-99?
280903-99 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-01-017-1535. 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.
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Last verified: July 2026