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Technical Data Sheet
81521 ✓ Verified by PartsTable
· COMPONENT
WHAT YOU NEED TO KNOW
Verify manufacturer and server generation compatibility Check if Option PN or Spare PN — same part, different channel
Confirm exact part number — similar PNs may be different parts
PRODUCT OVERVIEW

PISTON,INTERNAL COMBUSTION ENGIN. Key specifications include weight: 18.0 OUNCES OZ, diameter: 3.122 INCHES NOMINAL IN, material: ALUMINUM ALLOY, head_style: FLAT, oil_groove: NOT INCLUDED, skirt_type: SOLID. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 2815-00-023-5126, 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
81521
NSN: 2815-00-023-5126
FSC: 2815
CAGE: 13446 — PERKINS ENGINES INC (USA)
SPECIFICATIONS
weight18.0 OUNCES OZ
diameter3.122 INCHES NOMINAL IN
materialALUMINUM ALLOY
head_styleFLAT
oil_grooveNOT INCLUDED
skirt_typeSOLID
carbon_grooveNOT INCLUDED
overall_height3.145 INCHES NOMINAL IN
surface_finishFINISHED
oil_passage_typeHOLE LOCATION NOT OTHERWISE SPECIFIED
pin_hole_bushingNOT INCLUDED
pinhole_diameter0.9380 INCHES NOMINAL IN
NSN2815-00-023-5126
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available PISTON,INTERNAL COMBUSTION ENGIN TITLE COMPONENT PN 81521 MFR PISTON,INTERNAL COMBUS
KEY FEATURES
RING GROOVE WIDTH: 0.0650 INCHES NOMINAL SECOND RING IN
RING GROOVE DIAMETER: 2.830 INCHES NOMINAL FIRST RING IN
SKIRT BOTTOM CUTAWAY FEATURE: NOT INCLUDED
OIL GROOVE: NOT INCLUDED
TECHNICAL CHARACTERISTICS (FLIS)
RING GROOVE WIDTH0.0650 INCHES NOMINAL SECOND RING IN
RING GROOVE DIAMETER2.830 INCHES NOMINAL FIRST RING IN
RING GROOVE DIAMETER2.830 INCHES NOMINAL SECOND RING IN
RING GROOVE DIAMETER2.830 INCHES NOMINAL THIRD RING IN
RING GROOVE WIDTH0.0650 INCHES NOMINAL THIRD RING IN
SKIRT BOTTOM CUTAWAY FEATURENOT INCLUDED
OIL GROOVENOT INCLUDED
OVERALL HEIGHT3.145 INCHES NOMINAL IN
OIL PASSAGE TYPEHOLE LOCATION NOT OTHERWISE SPECIFIED
RING GROOVE QUANTITY5
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
8921-6Interchangeable
interchangeable cross-reference
interchangeable
309GInterchangeable
interchangeable cross-reference
interchangeable
954137Interchangeable
interchangeable cross-reference
interchangeable
603T2Interchangeable
interchangeable cross-reference
interchangeable
89205Interchangeable
interchangeable cross-reference
interchangeable
12908Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 81521?
81521 is a PISTON,INTERNAL COMBUSTION ENGIN.
What parts can replace 81521?
There are 19 known substitutes for 81521: 8921-6, 309G, 954137 and 16 more. Substitute compatibility should be verified for your specific system.
Is 81521 still available?
81521 is currently cancelled.
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