AL4S

View detailed technical data, stock status, and sourcing information for: AL4S
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Federal Supply Group

Engine Accessories

Federal Supply Classification

2920 Nonaircraft Engine Electrical System Components

National Stock Number

2920-00-647-3897

Item Name Code

00294

Assigment Date

01/01/1963 (63 years ago)

0.438 inches nominal reach length, 10000.0 nominal dc resistance rating in ohms, engine other than aircraft usage design, electrically shielded, partial insulator, gasket seat body style, 0.812 inches nominal width across flats

Product Characteristics

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

Body Style: electrically shielded, partial insulator, gasket seat
Dc Resistance Rating In Ohms: 10000.0 nominal
Reach Length: 0.438 inches nominal
Usage Design: engine other than aircraft
Width Across Flats: 0.812 inches nominal
Electrode Style: single flat shell ground electrode (see also style 4)
Seat Major Diameter: 0.795 inches nominal
Height Above Mounting Surface: 2.734 inches nominal
Top To Terminal Contact Distance: 1.000 inches nominal
Top To Shield Thread Distance: 0.125 inches nominal
Shield Thread Length: 0.250 inches nominal
Barrel Inside Diameter: 0.468 inches nominal
Terminal Sleeve Inside Diameter: 0.378 inches nominal
Pressure Rating: 235.0 pounds per square inch nominal mean effective
Thread Size And Series/Type Designator: 5/8-24 unef shield
Nondefinitive Spec/Std Data: 2 type and a class

Replaces National Stock Numbers

Below is a list of NSNs that have been officially superseded by this NSN:

NSN	Name	Date
2920-00-234-2253	No Name Available	01/10/2017
2920-00-293-5228	No Name Available	11/03/1972
2920-00-540-5577	No Name Available	12/24/1971
2920-00-561-2038	No Name Available	12/24/1971
2920-00-618-2368	No Name Available	05/01/1981
2920-00-647-3895	No Name Available	04/03/1969
2920-00-844-8856	No Name Available	07/24/1971
2920-00-891-3831	No Name Available	11/17/1971

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
AL4S	Spark Plug
ARL4S	Spark Plug
EH8	Spark Plug
XEH8	Spark Plug

FAQs

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

What is the FSCG of the NSN 2920-00-647-3897?

The FSCG of the NSN 2920-00-647-3897 is 2920

Does the NSN 2920-00-647-3897 have a Schedule B code assigned?

Yes, the Schedule B code is 8511100000

Does NSN 2920-00-647-3897 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 2920-00-647-3897 contain precious materials?

Precious metal content is unknown

Does NSN 2920-00-647-3897 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 2920-00-647-3897 was assigned to the Federal Catalog?

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