28373-040

View detailed technical data, stock status, and sourcing information for: 28373-040
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Federal Supply Group

Engines, Turbines, and Components

Federal Supply Classification

2805 Except Aircraft; and Components Gasoline Reciprocating Engines

National Stock Number

2805-00-377-5647

Item Name Code

16509

Assigment Date

01/01/1963 (63 years ago)

3.250 inches nominal diameter, flat head style, hole oil passage type, 3.500 inches nominal overall height, 0.8593 inches minimum and 0.8596 inches maximum pinhole diameter

Product Characteristics

Below you’ll find the complete technical specifications and performance data for this part, including material details and compliance information.

Head Style: flat
Overall Height: 3.500 inches nominal
Diameter: 3.250 inches nominal
Oil Passage Type: hole
Pinhole Diameter: 0.8593 inches minimum and 0.8596 inches maximum
Surface Finish: finished
Finished Size Designation: oversize
Oversize: 0.040 inches nominal
Skirt Type: solid
Skirt Bottom Cutaway Feature: not included
Ring Groove Quantity: 4
Ring Groove Width: 0.0955 inches minimum and 0.0965 inches maximum 2nd ring
Ring Groove Width: 0.0960 inches minimum and 0.0970 inches maximum 1st ring
Ring Groove Width: 0.1565 inches minimum and 0.1575 inches maximum 3rd ring
Ring Groove Width: 0.1565 inches minimum and 0.1575 inches maximum 4th ring
Ring Groove Diameter: 2.896 inches minimum and 2.906 inches maximum 1st ring
Ring Groove Diameter: 2.886 inches minimum and 2.896 inches maximum 2nd ring
Ring Groove Diameter: 2.886 inches minimum and 2.896 inches maximum 3rd ring
Ring Groove Diameter: 2.886 inches minimum and 2.896 inches maximum 4th ring
Oil Groove: not included
Distance From Pin Hole Center To Extreme Top: 1.995 inches minimum and 2.000 inches maximum
Pin Hole Bushing: not included
Distance Between Pin Bosses: 1.380 inches nominal
Retaining Ring Groove: included
Pin: included
Pin Type For Which Designed: floating
Ring: included
Carbon Groove: not included
Material: aluminum alloy
Weight: 18.9 ounces

Related Parts

This NSN group includes multiple components designed to meet specific performance and operational standards. Each listing provides detailed specs, functionality data, and replacement compatibility information:

Part Number	Name
00187004-4	Internal Combustion Engin Piston
28373-040	Internal Combustion Engin Piston
F218A04041E40	Internal Combustion Engin Piston
F218A4041E040	Internal Combustion Engin Piston
MS13958-3	Internal Combustion Engin Piston

FAQs

Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.

What is the FSCG of the NSN 2805-00-377-5647?

The FSCG of the NSN 2805-00-377-5647 is 2805

Does the NSN 2805-00-377-5647 have a Schedule B code assigned?

Yes, the Schedule B code is 8409918000

Does NSN 2805-00-377-5647 require demilitarization?

Items subject to the export administration regulations (ear) in parts 730-774 of title 15, code of federal regulations (cfr) (ccli or ear99) and determined by dod to present a low risk when released out of dod control. No demil, mut, or end use certificate is required. May require an export licensefrom doc.

Does NSN 2805-00-377-5647 contain precious materials?

Precious metal content is unknown

Does NSN 2805-00-377-5647 contain hazardous materials?

Indicates there is no data in the hmirs and the nsn is in a fsc not generally suspected of containing hazardous materials.

When the NSN 2805-00-377-5647 was assigned to the Federal Catalog?

It was assigned 63 years ago, on Tue, Jan 1, 1963