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K 521 ✓ 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 angle: 30.0 DEGREES, wheel_style: SPECIAL "ZB", hole_diameter: 0.750 INCHES NOMINAL IN, wheel_diameter: 2.750 INCHES NOMINAL IN, mounting_method: THREADED INSERT, thread_direction: RIGHT-HAND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 3460-00-491-0224, 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
K 521
NSN: 3460-00-491-0224
FSC: 3460
CAGE: 00988 — SIOUX TOOLS INC (USA)
SPECIFICATIONS
angle30.0 DEGREES
wheel_styleSPECIAL "ZB"
hole_diameter0.750 INCHES NOMINAL IN
wheel_diameter2.750 INCHES NOMINAL IN
mounting_methodTHREADED INSERT
thread_directionRIGHT-HAND
overall_thickness2.188 INCHES NOMINAL IN
component_quantity10
end_item_identificationVALVE SEAT GRINDING
nonsupply_items_and_quantitiesGROOVE PIN 2; O-RING 3; SPIRAL PIN 1; 4-WAY VALVE 1; 4-WAY VALVE SPRING 1; GASKET 1; STRAINER ASSY 1
thread_size_and_series/type_designator0.875-14 UNIFIED NATIONAL COARSE (UNC)
NSN3460-00-491-0224
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available PISTON,INTERNAL COMBUSTION ENGIN TITLE COMPONENT PN K 521 MFR PISTON,INTERNAL COMBUS
KEY FEATURES
•
HOLE DIAMETER: 0.750 INCHES NOMINAL IN
•
THREAD DIRECTION: RIGHT-HAND
•
OVERALL THICKNESS: 2.188 INCHES NOMINAL IN
•
WHEEL STYLE: SPECIAL "ZB"
•
THREAD SIZE AND SERIES/TYPE DESIGNATOR: 0.875-14 UNIFIED NATIONAL COARSE (UNC)
•
WHEEL DIAMETER: 2.750 INCHES NOMINAL IN
•
ANGLE: 30.0 DEGREES
•
MOUNTING METHOD: THREADED INSERT
TECHNICAL CHARACTERISTICS (FLIS)
HOLE DIAMETER0.750 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
OVERALL THICKNESS2.188 INCHES NOMINAL IN
WHEEL STYLESPECIAL "ZB"
THREAD SIZE AND SERIES/TYPE DESIGNATOR0.875-14 UNIFIED NATIONAL COARSE (UNC)
WHEEL DIAMETER2.750 INCHES NOMINAL IN
ANGLE30.0 DEGREES
MOUNTING METHODTHREADED INSERT
END ITEM IDENTIFICATIONVALVE SEAT GRINDING
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
109099Interchangeable
interchangeable cross-reference
interchangeable
109099-001Interchangeable
interchangeable cross-reference
interchangeable
K17Interchangeable
interchangeable cross-reference
interchangeable
SXF39Interchangeable
interchangeable cross-reference
interchangeable
K25Interchangeable
interchangeable cross-reference
interchangeable
K95Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is K 521?
K 521 is a PISTON,INTERNAL COMBUSTION ENGIN.
What parts can replace K 521?
There are 14 known substitutes for K 521: 109099, 109099-001, K17 and 11 more. Substitute compatibility should be verified for your specific system.
What is the NSN for K 521?
K 521 is cataloged in the Federal Logistics Information System (FLIS) under NSN 3460-00-491-0224. 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.
PartsTable Design LLC · partstable.com
Last verified: July 2026