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Technical Data Sheet
21494-1 ✓ 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

COVER,ENGINE POPPET VALVE ROCKER. Key specifications include material: PLASTIC SEALING ELEMENT, case_style: SQUARE, scale_name: OIL TEMPERATURE, seal_width: 0.297 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN, body_length: 1.090 INCHES MAXIMUM IN, temp_rating: 300.0 FAHRENHEIT DEGF. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-821-0817, 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 21494-1
NSN: 5330-00-821-0817
FSC: 5330
CAGE: 12603 — CLARK EQUIPMENT CO (USA)
SPECIFICATIONS
materialPLASTIC SEALING ELEMENT
case_styleSQUARE
scale_nameOIL TEMPERATURE
seal_width0.297 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN
body_length1.090 INCHES MAXIMUM IN
temp_rating300.0 FAHRENHEIT DEGF
terminal_typeWIRE LEAD
thread_length0.375 INCHES NOMINAL SINGLE THREADED BUSHING IN
overall_length1.090 INCHES MAXIMUM IN
scale_quantity1
mounting_methodTHREADED BUSHING
outside_diameter5.004 INCHES NOMINAL IN
NSN5330-00-821-0817
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 21494-1 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
ACCOMMODATED SHAFT DIAMETER: 4.000 INCHES NOMINAL IN
TEMP RATING: 300.0 FAHRENHEIT DEGF
OUTSIDE DIAMETER: 5.004 INCHES NOMINAL IN
SEAL WIDTH: 0.297 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN
HOUSING BORE DIAMETER: 4.999 INCHES NOMINAL IN
CASE STYLE: SQUARE
SURFACE TREATMENT: PLASTIC CASE
SEALING ELEMENT STYLE: ANGULAR
TECHNICAL CHARACTERISTICS (FLIS)
ACCOMMODATED SHAFT DIAMETER4.000 INCHES NOMINAL IN
TEMP RATING300.0 FAHRENHEIT DEGF
OUTSIDE DIAMETER5.004 INCHES NOMINAL IN
SEAL WIDTH0.297 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN
HOUSING BORE DIAMETER4.999 INCHES NOMINAL IN
CASE STYLESQUARE
SURFACE TREATMENTPLASTIC CASE
SEALING ELEMENT STYLEANGULAR
MATERIALPLASTIC SEALING ELEMENT
ACCOMMODATED SHAFT MAXIMUM RATED SPEED3600 FEET PER MINUTE FT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
0314 5262Interchangeable
interchangeable cross-reference
interchangeable
1786074Interchangeable
interchangeable cross-reference
interchangeable
LOCTITE MOLY DRY FILM LUBRICANTInterchangeable
interchangeable cross-reference
interchangeable
21494Interchangeable
interchangeable cross-reference
interchangeable
21494-3Interchangeable
interchangeable cross-reference
interchangeable
54B700778P1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21494-1?
21494-1 is a COVER,ENGINE POPPET VALVE ROCKER. It is classified as a MRO (MRO_GENERAL).
What parts can replace 21494-1?
There are 20 known substitutes for 21494-1: 0314 5262, 1786074, LOCTITE MOLY DRY FILM LUBRICANT and 17 more. Substitute compatibility should be verified for your specific system.
Is 21494-1 still available?
21494-1 is currently cancelled.
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