390981 — PISTON,INTERNAL COMBUSTION ENGIN

✓ Government record, cited

— · COMPONENT

PRODUCT OVERVIEW

390981: PISTON,INTERNAL COMBUSTION ENGIN.

PISTON,INTERNAL COMBUSTION ENGIN. Key specifications include material: STEEL COMP 303 OVERALL, head_style: HEXAGON, head_height: 0.075 INCHES NOMINAL IN, thread_class: 2A A, thread_length: 0.135 INCHES NOMINAL IN, shoulder_shape: ROUND FIRST SHOULDER. This part is cataloged in the U.S.

Government catalog under NSN 2805-01-226-3418, 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

390981

NSN: 2805-01-226-3418
NIINs: 012263418, 014192391
FSC: 2805 — Gasoline Reciprocating Engines, Except Aircraft; and Components
CAGE: 80256 — OUTBOARD MARINE CORP (USA)

SPECIFICATIONS

material	STEEL COMP 303 OVERALL
head_style	HEXAGON
head_height	0.075 INCHES NOMINAL IN
thread_class	2A A
thread_length	0.135 INCHES NOMINAL IN
shoulder_shape	ROUND FIRST SHOULDER
fastener_length	0.390 INCHES MINIMUM AND 0.395 INCHES MAXIMUM IN
shoulder_length	0.260 INCHES NOMINAL FIRST SHOULDER IN
thread_direction	RIGHT-HAND
shoulder_diameter	0.200 INCHES MINIMUM AND 0.205 INCHES MAXIMUM FIRST SHOULDER IN
surface_treatment	PASSIVATE OVERALL
width_between_flats	0.180 INCHES MINIMUM AND 0.203 INCHES MAXIMUM IN
NSN	2805-01-226-3418

COMPONENT DIAGRAM

KEY FEATURES

•

SURFACE FINISH: FINISHED

•

PIN: INCLUDED

•

RING GROOVE QUANTITY: 2

•

FINISHED SIZE DESIGNATION: STANDARD

TECHNICAL CHARACTERISTICS

SURFACE FINISH	FINISHED
PIN	INCLUDED
RING GROOVE QUANTITY	2
FINISHED SIZE DESIGNATION	STANDARD

SUBSTITUTES & CROSS-REFERENCES 4

388671Reference document

Same NSN cross-reference

Reference document — Secondary reference

432171Reference document

Same NSN cross-reference

Reference document — Secondary reference

393271Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

0393271Reference document

Same NSN cross-reference

Reference document — Secondary reference

LIFECYCLE

NSN statusActive· U.S. Government catalog

Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required

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FREQUENTLY ASKED QUESTIONS

What is 390981?

390981 is a PISTON,INTERNAL COMBUSTION ENGIN.

What parts can replace 390981?

There are 4 known substitutes for 390981: 388671, 432171, 393271 and 1 more. Substitute compatibility should be verified for your specific system.

What is the NSN for 390981?

390981 is cataloged in the U.S. Government catalog under NSN 2805-01-226-3418. This indicates validated use in U.S. government and defense supply chains.

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390981 — PISTON,INTERNAL COMBUSTION ENGIN

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