74371631

View detailed technical data, stock status, and sourcing information for: 74371631
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Federal Supply Group

Engines, Turbines, and Components

Federal Supply Classification

2815 Diesel Engines and Components

National Stock Number

2815-00-632-4134

Item Name Code

16509

Assigment Date

01/01/1961 (65 years ago)

5.250 inches nominal diameter, hole oil passage type, flat head style, 6.725 inches nominal overall height, 1.7480 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: flat
Overall Height: 6.725 inches nominal
Diameter: 5.250 inches nominal
Oil Passage Type: hole
Pinhole Diameter: 1.7480 inches nominal
Surface Finish: finished
Finished Size Designation: standard
Skirt Type: solid
Skirt Bottom Cutaway Feature: not included
Ring Groove Quantity: 5
Ring Groove Width: 0.2500 inches nominal 4th ring
Ring Groove Width: 0.2500 inches nominal 5th ring
Ring Groove Width: 0.1250 inches nominal 1st ring
Ring Groove Width: 0.1240 inches nominal 2nd ring
Ring Groove Width: 0.1240 inches nominal 3rd ring
Ring Groove Diameter: 4.745 inches nominal 4th ring
Ring Groove Diameter: 4.745 inches nominal 5th ring
Ring Groove Diameter: 4.700 inches nominal 1st ring
Ring Groove Diameter: 4.798 inches nominal 2nd ring
Ring Groove Diameter: 4.798 inches nominal 3rd ring
Ring Groove Position Below Piston Pin: number 1,number 2,number 3,number 4,and number 5 all rings
Oil Groove: not included
Distance From Pin Hole Center To Extreme Top: 3.750 inches nominal
Pin Hole Bushing: not included
Distance Between Pin Bosses: 2.015 inches nominal
Retaining Ring Groove: included
Pin: included
Pin Type For Which Designed: floating
Ring: not included
Carbon Groove: not included
Skirt Slot Style: no slot
Material: aluminum alloy
Weight: 113.0 ounces

Replaces National Stock Numbers

Below is a list of NSNs that have been officially superseded by this NSN:

NSN	Name	Date
2815-00-352-3335	No Name Available	08/20/1969

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
4371631	Internal Combustion Engin Piston
74371631	Internal Combustion Engin Piston
74396585	Internal Combustion Engin Piston

FAQs

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

What is the FSCG of the NSN 2815-00-632-4134?

The FSCG of the NSN 2815-00-632-4134 is 2815

Does the NSN 2815-00-632-4134 have a Schedule B code assigned?

Yes, the Schedule B code is 8409998000

Does NSN 2815-00-632-4134 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 2815-00-632-4134 contain precious materials?

Precious metal content is unknown

Does NSN 2815-00-632-4134 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 2815-00-632-4134 was assigned to the Federal Catalog?

It was assigned 65 years ago, on Sun, Jan 1, 1961