21616R11

View detailed technical data, stock status, and sourcing information for: 21616R11
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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

2805-00-138-2186

Item Name Code

16509

Assigment Date

07/24/1971 (55 years ago)

dome head style, 3.875 inches nominal diameter, 3.665 inches nominal overall height, finished surface finish, 1.0630 inches nominal 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: dome
Overall Height: 3.665 inches nominal
Diameter: 3.875 inches nominal
Pinhole Diameter: 1.0630 inches nominal
Surface Finish: finished
Finished Size Designation: oversize
Oversize: 0.010 inches nominal
Skirt Type: solid
Cut Depth: 0.567 inches nominal
Skirt Bottom Cutaway Feature: included
Ring Groove Quantity: 3
Ring Groove Width: 0.1880 inches nominal 3rd ring
Ring Groove Width: 0.0940 inches nominal 1st ring
Ring Groove Width: 0.0940 inches nominal 2nd ring
Ring Groove Diameter: 3.810 inches nominal 3rd ring
Ring Groove Diameter: 3.840 inches nominal 1st ring
Ring Groove Diameter: 3.848 inches nominal 2nd ring
Oil Groove: not included
Distance From Pin Hole Center To Extreme Top: 1.938 inches nominal
Pin Hole Bushing: not included
Distance Between Pin Bosses: 2.875 inches nominal
Retaining Ring Groove: not included
Pin: included
Pin Type For Which Designed: floating
Ring: not included
Carbon Groove: not included
Material: aluminum alloy

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
1394P010	Internal Combustion Engin Piston
2041PN010	Internal Combustion Engin Piston
216161R11	Internal Combustion Engin Piston
21616R11	Internal Combustion Engin Piston
4045G010	Internal Combustion Engin Piston
8101P010	Internal Combustion Engin Piston
873562R11	Internal Combustion Engin Piston
992P+10	Internal Combustion Engin Piston
L161F010	Internal Combustion Engin Piston
P1414P010	Internal Combustion Engin Piston
P800AX010	Internal Combustion Engin Piston
TC323-010	Internal Combustion Engin Piston

FAQs

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

What is the FSCG of the NSN 2805-00-138-2186?

The FSCG of the NSN 2805-00-138-2186 is 2805

Does the NSN 2805-00-138-2186 have a Schedule B code assigned?

Yes, the Schedule B code is 8409918000

Does NSN 2805-00-138-2186 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 2805-00-138-2186 contain precious materials?

Precious metal content is unknown

Does NSN 2805-00-138-2186 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 2805-00-138-2186 was assigned to the Federal Catalog?

It was assigned 55 years ago, on Sat, Jul 24, 1971