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PartsTable / COMPONENT / A978S
A978S ✓ 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

The VALVE,POPPET,ENGINE is a the manufacturer industrial component. Key specifications include material: STEEL HEAD, head_style: FLAT, stem_style: DOUBLE GROOVED, head_height: 0.1875 INCHES NOMINAL IN, neck_radius: 0.3125 INCHES NOMINAL IN, stem_length: 4.6775 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 2805-00-353-7617, 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
A978S
NSN: 2805-00-353-7617
FSC: 2805
CAGE: 77576 — STERLING DIV FEDERAL MOGUL CORP (USA)
SPECIFICATIONS
materialSTEEL HEAD
head_styleFLAT
stem_styleDOUBLE GROOVED
head_height0.1875 INCHES NOMINAL IN
neck_radius0.3125 INCHES NOMINAL IN
stem_length4.6775 INCHES NOMINAL IN
stem_diameter0.3125 INCHES NOMINAL IN
chamfer_length0.0625 INCHES NOMINAL IN
outside_diameter1.2500 INCHES NOMINAL IN
seat_angle_in_deg45.0
first_groove_width0.2650 INCHES NOMINAL IN
second_groove_width0.3750 INCHES NOMINAL IN
NSN2805-00-353-7617
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available VALVE,POPPET,ENGINE TITLE COMPONENT PN A978S MFR VALVE,POPPET,ENGINE
KEY FEATURES
•
DISTANCE FROM FIRST GROOVE TO STEM END: 0.2500 INCHES NOMINAL IN
•
HEAD HEIGHT: 0.1875 INCHES NOMINAL IN
•
CHAMFER ANGLE IN DEG: 30.0
•
STEM LENGTH: 4.6775 INCHES NOMINAL IN
•
SECOND GROOVE DIAMETER: 0.2890 INCHES NOMINAL IN
•
FIRST GROOVE WIDTH: 0.2650 INCHES NOMINAL IN
•
CHAMFER LENGTH: 0.0625 INCHES NOMINAL IN
•
SECOND GROOVE WIDTH: 0.3750 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
DISTANCE FROM FIRST GROOVE TO STEM END0.2500 INCHES NOMINAL IN
HEAD HEIGHT0.1875 INCHES NOMINAL IN
CHAMFER ANGLE IN DEG30.0
STEM LENGTH4.6775 INCHES NOMINAL IN
SECOND GROOVE DIAMETER0.2890 INCHES NOMINAL IN
FIRST GROOVE WIDTH0.2650 INCHES NOMINAL IN
CHAMFER LENGTH0.0625 INCHES NOMINAL IN
SECOND GROOVE WIDTH0.3750 INCHES NOMINAL IN
STEM DIAMETER0.3125 INCHES NOMINAL IN
DISTANCE FROM SECOND GROOVE TO STEM END3.4440 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
N1173Interchangeable
interchangeable cross-reference
interchangeable
2759-33-2157-2515Interchangeable
interchangeable cross-reference
interchangeable
AS5022AInterchangeable
interchangeable cross-reference
interchangeable
2-6-1207Interchangeable
interchangeable cross-reference
interchangeable
CO-PD-02-02Interchangeable
interchangeable cross-reference
interchangeable
A978Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A978S?
A978S is a VALVE,POPPET,ENGINE.
What parts can replace A978S?
There are 8 known substitutes for A978S: N1173, 2759-33-2157-2515, AS5022A and 5 more. Substitute compatibility should be verified for your specific system.
Is A978S still available?
A978S is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026