A657

View detailed technical data, stock status, and sourcing information for: A657
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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

2805-00-752-0166

Item Name Code

15884

Assigment Date

01/01/1962 (64 years ago)

A two electrode semiconductor device having an asymmetrical voltage - current characteristic. May or may not include mounting hardware and/or heatsink. Excludes:light emitting diode and semiconductor device,photo. For items containing material such as selenium and copper oxide, see recifier, metallic.

1.6360 inches minimum and 1.6460 inches maximum outside diameter, flat head style, 0.1450 inches minimum and 0.1600 inches maximum head height, 0.0312 inches nominal chamfer length, 45.0 chamfer angle in deg

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
Head Height: 0.1450 inches minimum and 0.1600 inches maximum
Chamfer Angle In Deg: 45.0
Chamfer Length: 0.0312 inches nominal
Outside Diameter: 1.6360 inches minimum and 1.6460 inches maximum
Seat Angle In Deg: 30.0
Stem Style: double grooved
Carbon Relief Groove: not included
Neck Radius: 0.5312 inches nominal
Stem Length: 6.1320 inches nominal
Stem Diameter: 0.3410 inches minimum and 0.3417 inches maximum
Distance From First Groove To Stem End: 0.6880 inches nominal
Distance From Second Groove To Stem End: 0.9330 inches nominal
First Groove Diameter: 0.3000 inches minimum and 0.3060 inches maximum
Second Groove Diameter: 0.3000 inches minimum and 0.3060 inches maximum
First Groove Width: 0.0950 inches minimum and 0.1050 inches maximum
Second Groove Width: 0.0950 inches minimum and 0.1050 inches maximum
Metallic Hardness Rating And Location: 42.0 rockwell c nominal tip
Fsc Application Data: gasoline engine

Replaces National Stock Numbers

Below is a list of NSNs that have been officially superseded by this NSN:

NSN	Name	Date
2805-00-176-5327	No Name Available	01/01/1963
2805-00-386-3661	No Name Available	01/01/1963

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
3688065	Engine Poppet Valve
7520166	Engine Poppet Valve
839504	Engine Poppet Valve
A657	Engine Poppet Valve
I-199	Engine Poppet Valve
T1641	Engine Poppet Valve
V1111	Engine Poppet Valve
V1309N	Engine Poppet Valve
V1641	Engine Poppet Valve

FAQs

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

What is the FSCG of the NSN 2805-00-752-0166?

The FSCG of the NSN 2805-00-752-0166 is 2805

Does the NSN 2805-00-752-0166 have a Schedule B code assigned?

Yes, the Schedule B code is 8409918000

Does NSN 2805-00-752-0166 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 2805-00-752-0166 contain precious materials?

Precious metal content is unknown

Does NSN 2805-00-752-0166 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 2805-00-752-0166 was assigned to the Federal Catalog?

It was assigned 64 years ago, on Mon, Jan 1, 1962