PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

T-6603Muffler,exhaust

Cummins Filtration Inc. · NSN 2990-00-707-7522 · FSC 2990 · No Item Name Available
Verified by PartsTable
NSN 2990-00-707-7522 — this item is cataloged by the U.S. Government under National Stock Number 2990-00-707-7522. Primary manufacturer part number: T-6603.
Features
  • Muffler,exhaust — FSC 2990
  • Inlet Inside Diameter: 1.781 INCHES NOMINAL FIRST INLET IN
  • Design Type: DRY
  • Inlet Connection Type: UNTHREADED SECOND INLET
  • Body Shape: ROUND
  • Coolant Type: AIR
  • Muffler Design: MULTIPASS
  • Outlet Location: CENTRALLY LOCATED IN END SECTION OPPOSITE INLET
Applications
  • Applications requiring Steel Location Not Otherwise Specified construction
General Description

The Muffler,exhaust, cataloged under National Stock Number 2990-00-707-7522, is classified within Federal Supply Class 2990 (No Item Name Available) of the Engine Accessories group. The primary manufacturer of record is Cummins Filtration Inc.. Government technical data includes 20 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 5 commercial cross-references from 4 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN2990-00-707-7522
Primary Part NumberT-6603
Item NameMuffler,exhaust
FSC / FSG2990 / 29 — No Item Name Available
ManufacturerCummins Filtration Inc.
StatusACTIVE
Inlet Inside Diameter1.781 INCHES NOMINAL FIRST INLET IN
Design TypeDRY
Inlet Connection TypeUNTHREADED SECOND INLET
Body ShapeROUND
Coolant TypeAIR
Muffler DesignMULTIPASS
Outlet LocationCENTRALLY LOCATED IN END SECTION OPPOSITE INLET
Outlet Inside Diameter2.390 INCHES NOMINAL FIRST OUTLET IN
MaterialSTEEL LOCATION NOT OTHERWISE SPECIFIED
Inlet Projection Length1.125 INCHES NOMINAL SECOND INLET IN
Operating PositionHORIZONTAL
Outlet Projection Length2.000 INCHES NOMINAL FIRST OUTLET IN
Inlet Inside Diameter1.781 INCHES NOMINAL SECOND INLET IN
Inlet Projection Length1.125 INCHES NOMINAL FIRST INLET IN
Surface TreatmentALUMINUM
Outlet Connection TypeUNTHREADED FIRST OUTLET
Overall Diameter7.625 INCHES NOMINAL IN
Inlet Connection TypeUNTHREADED FIRST INLET
Inlet LocationIN END SECTION OPPOSITE OUTLET,IN END SECTION OPPOSITE OUTLET
Tube Quantity3
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5940-00-082-4748 INTERCHANGEABLE
Terminal,feedthru
5940-00-177-7929734834-1 INTERCHANGEABLE
Terminal,lug
L3harris Cincinnati Electronics Corporation
4720-00-189-2775SAE-20R1ECS-A-25X914 INTERCHANGEABLE
Hose,nonmetallic
Sae International Dba Sae International
5975-00-567-27666603 INTERCHANGEABLE
Panel,blank
Ango Electronics Corporation Dba Par Metal Products
2815-00-710-185119925 INTERCHANGEABLE
Lever Assembly,e,ha
Napco International Llc Dba Napco International Inc
5905-01-039-53322815393 INTERCHANGEABLE
Resistor,variable,wire Wound,pre
Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier
4320-01-081-33696603 INTERCHANGEABLE
Impeller,pump,centrifugal
Oberdorfer Foundries Inc
3655-01-134-8410660-3 INTERCHANGEABLE
Intercooler
Graham Corp
5360-01-175-73536603 INTERCHANGEABLE
Spring,helical,compression
Greno Industries, Inc. Dba Greno Industries Inc
3610-01-184-74996603 INTERCHANGEABLE
Collator,paper,automatic
Abd Intl Inc Dba Abdick
Cross-Reference Index
Part NumberManufacturer
A222158 Joy Mfg Co Air Power Group Michigan City Plant (USA)
A222158 Joy Global Underground Mining Llc (USA)
6603 Cummins Filtration Inc. (USA)
T-6603 PRIMARY Cummins Filtration Inc. (USA)
ABT6603 Ar Bee Corp (USA)
Related Parts
5940-00-082-4748INTERCHANGEABLE
TERMINAL,FEEDTHRU
5940-00-177-7929INTERCHANGEABLE
TERMINAL,LUG
734834-1
4720-00-189-2775INTERCHANGEABLE
HOSE,NONMETALLIC
SAE-20R1ECS-A-25X914
5975-00-567-2766INTERCHANGEABLE
PANEL,BLANK
6603
2815-00-710-1851INTERCHANGEABLE
LEVER ASSEMBLY,E,HA
19925
5905-01-039-5332INTERCHANGEABLE
RESISTOR,VARIABLE,WIRE WOUND,PRE
2815393
4320-01-081-3369INTERCHANGEABLE
IMPELLER,PUMP,CENTRIFUGAL
6603
3655-01-134-8410INTERCHANGEABLE
INTERCOOLER
660-3
5360-01-175-7353INTERCHANGEABLE
SPRING,HELICAL,COMPRESSION
6603
3610-01-184-7499INTERCHANGEABLE
COLLATOR,PAPER,AUTOMATIC
6603
2920-01-218-5065INTERCHANGEABLE
IGNITION WIRE SET,SPARK PLUG
12043717
6910-01-465-7903INTERCHANGEABLE
TEETH,DENTAL MODEL
T660/3

Frequently Asked Questions

What is NSN 2990-00-707-7522?

NSN 2990-00-707-7522 is a Muffler,exhaust, manufactured by Cummins Filtration Inc., classified under FSC 2990 (No Item Name Available). Status: active.

What are the part numbers for NSN 2990-00-707-7522?

NSN 2990-00-707-7522 has 5 cross-referenced part numbers: A222158 (Joy Mfg Co Air Power Group Michigan City Plant), A222158 (Joy Global Underground Mining Llc), 6603 (Cummins Filtration Inc.), T-6603 (Cummins Filtration Inc.), ABT6603 (Ar Bee Corp).

What NSN replaces 2990-00-707-7522?

There are 12 known substitutes for 2990-00-707-7522: 5940-00-082-4748, 5940-00-177-7929, 4720-00-189-2775 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of T-6603?

Key specifications for T-6603: Overall Length: 7.625 INCHES NOMINAL IN; Inlet Inside Diameter: 1.781 INCHES NOMINAL FIRST INLET IN; Design Type: DRY; Inlet Connection Type: UNTHREADED SECOND INLET. 23 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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