1269638

View detailed technical data, stock status, and sourcing information for: 1269638
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Federal Supply Group

Engine Accessories

Federal Supply Classification

2990 Nonaircraft Miscellaneous Engine Accessories

National Stock Number

2990-00-737-3681

Item Name Code

10849

Assigment Date

01/01/1963 (63 years ago)

A rigid tubular item designed to direct the exhaust gases away from an engine, heater, or the like. For flexible items, see hose, metallic.

dry design type, 5.063 inches nominal overall diameter, unthreaded 1st inlet inlet connection type, 18.000 inches nominal overall length, flange 2nd inlet inlet connection type

Product Characteristics

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

Overall Length: 18.000 inches nominal
Inlet Connection Type: flange 2nd inlet
Inlet Connection Type: unthreaded 1st inlet
Overall Diameter: 5.063 inches nominal
Design Type: dry
Coolant Type: air
Muffler Design: straight through
Body Shape: round
Operating Position: horizontal
Inlet Location: centrally located in end section of body all inletscentrally located in end section of body single inlet
Inlet Projection Length: 1.375 inches nominal 2nd inlet
Inlet Projection Length: 1.875 inches nominal 1st inlet
Inlet Flange Mounting Provision And Quantity: 2 holes2 holes 2nd inlet2 holes single inlet
Inlet Flange Mounting Hole Diameter: 0.500 inches nominal0.500 inches nominal 2nd inlet0.500 inches nominal single inlet
Inlet Flange Mounting Provision Spacing: 3-3/8 in. c to c dim. of holes all inlets
Inlet Flange Mounting Provision Spacing: 3-3/8 in. c to c dim. of holes single inlet
Inlet Outside Diameter: 1.840 inches nominal 2nd inlet
Inlet Inside Diameter: 1.744 inches nominal all inlets
Outlet Connection Type: flange 1st outlet
Outlet Location: centrally located in end section of body 1st outlet
Outlet Projection Length: 1.125 inches nominal 1st outlet
Outlet Flange Mounting Provision And Quantity: 2 holes 1st outlet
Outlet Flange Mounting Hole Diameter: 0.500 inches nominal 1st outlet
Outlet Flange Mounting Stud Length: 1.250 inches nominal 1st outlet
Outlet Flange Mounting Provision Spacing: 3-3/8 in. c to c dim. of holes 1st outlet
Material: steel location not otherwise specified
Surface Treatment: aluminum

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
1269638	Exhaust Muffler
7373681	Exhaust Muffler

FAQs

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

What is the FSCG of the NSN 2990-00-737-3681?

The FSCG of the NSN 2990-00-737-3681 is 2990

Does the NSN 2990-00-737-3681 have a Schedule B code assigned?

Yes, the Schedule B code is 8708925000

Does NSN 2990-00-737-3681 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 2990-00-737-3681 contain precious materials?

Precious metal content is unknown

Does NSN 2990-00-737-3681 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 2990-00-737-3681 was assigned to the Federal Catalog?

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