The Starter,engine,air, cataloged under National Stock Number 2990-01-121-0599, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Caterpillar Inc Div Caterpillar Defense. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-01-121-0599 |
| Primary Part Number | 3N9411 |
| Item Name | Starter,engine,air |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| General Characteristics Item Description | BODY ROUND 9.625 IN. DIA.; 21 INS. OVERALL LENGTH; STEEL OVERALL; 1 INLET 2 IN. NPTF THREAD; 1 OUTLET 2 1/2 IN. NPTF THREAD; FLANGE MOUNTED 3 BOLT HOLES; 2.875 IN. BOLT HOLE CIRCLE; PINION DATA: 11 TEETH; 6/8 PITCH; 2 IN. PITCH DIA.; 2 1/4 IN. OUTSIDE DIA.; 20 DEGREE PRESSURE ANGLE; END ITEM CATERPILLAR MODEL D-348-TA DIESEL ENGINE IN |
| Cubic Measure | 2.000 CUBIC FEET |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 3N9411 PRIMARY | Caterpillar Inc Div Caterpillar Defense (USA) |
| Reference | Meaning |
|---|---|
| VRSM110/3N9413 | 5/9 Secondary reference U.S. Government activity |
| VRSM110/3N9413 | C/1 Advisory reference — outside the item-of-supply concept Siemens Energy, Inc. Dba Dresser-Rand |
NSN 2990-01-121-0599 is a Starter,engine,air, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-01-121-0599 has 1 manufacturer part number on file: 3N9411 (Caterpillar Inc Div Caterpillar Defense).
Key specifications for 3N9411: General Characteristics Item Description: BODY ROUND 9.625 IN. DIA.; 21 INS. OVERALL LENGTH; STEEL OVERALL; 1 INLET 2 IN. NPTF THREAD; 1 OUTLET 2 1/2 IN. NPTF THREAD; FLANGE MOUNTED 3 BOLT HOLES; 2.875 IN. BOLT HOLE CIRCLE; PINION DATA: 11 TEETH; 6/8 PITCH; 2 IN. PITCH DIA.; 2 1/4 IN. OUTSIDE DIA.; 20 DEGREE PRESSURE ANGLE; END ITEM CATERPILLAR MODEL D-348-TA DIESEL ENGINE IN; Cubic Measure: 2.000 CUBIC FEET. 2 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.