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Technical Data Sheet
28121 ✓ Verified by PartsTable
· MRO · MRO_GENERAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

FILTER ELEMENT,INTAKE AIR CLEANE. Key specifications include height: 0.718 INCHES NOMINAL IN, diameter: 0.680 INCHES NOMINAL IN, material: PAPER FILTERING MEDIUM, case_style: SQUARE, head_style: FLAT COUNTERSUNK, joint_type: SCARF-PERIPHERAL TOP RING. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-225-9122, 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
MRO MRO_GENERAL 28121
NSN: 5330-00-225-9122
FSC: 5330
CAGE: 10988 — CNH INDUSTRIAL AMERICA LLC DBA CNH AMERICA (USA)
SPECIFICATIONS
height0.718 INCHES NOMINAL IN
diameter0.680 INCHES NOMINAL IN
materialPAPER FILTERING MEDIUM
case_styleSQUARE
head_styleFLAT COUNTERSUNK
joint_typeSCARF-PERIPHERAL TOP RING
seal_width0.250 INCHES NOMINAL IN
design_typeNONREUSABLE
temp_rating-65.0 FAHRENHEIT AND 250.0 FAHRENHEIT DEGF
venier_scaleNOT INCLUDED
body_diameter5.703 INCHES MINIMUM AND 5.718 INCHES MAXIMUM IN
overall_height4.000 INCHES NOMINAL IN
NSN5330-00-225-9122
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 28121 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
INSIDE DIAMETER: 2.000 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLE: U INTERMEDIATE RING
HEIGHT: 0.718 INCHES NOMINAL IN
JOINT TYPE: SCARF-PERIPHERAL TOP RING
INTERMEDIATE RING QUANTITY: 3
OUTSIDE DIAMETER: 2.500 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
INSIDE DIAMETER2.000 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLEU INTERMEDIATE RING
HEIGHT0.718 INCHES NOMINAL IN
JOINT TYPESCARF-PERIPHERAL TOP RING
INTERMEDIATE RING QUANTITY3
OUTSIDE DIAMETER2.500 INCHES NOMINAL IN
JOINT TYPESCARF-PERIPHERAL INTERMEDIATE RING
JOINT TYPESCARF-PERIPHERAL BOTTOM RING
MATERIALASBESTOS OR RUBBER SYNTHETIC OR COTTON INTERMEDIATE RING
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
28121Interchangeable
interchangeable cross-reference
interchangeable
D139Interchangeable
interchangeable cross-reference
interchangeable
1761-0375Interchangeable
interchangeable cross-reference
interchangeable
A28121Interchangeable
interchangeable cross-reference
interchangeable
28121-1500PSIInterchangeable
interchangeable cross-reference
interchangeable
HDA-4046Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 28121?
28121 is a FILTER ELEMENT,INTAKE AIR CLEANE. It is classified as a MRO (MRO_GENERAL).
What parts can replace 28121?
There are 11 known substitutes for 28121: 28121, D139, 1761-0375 and 8 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 28121?
28121 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-225-9122. This indicates validated use in U.S. government and defense supply chains.
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