The Pipe,exhaust, cataloged under National Stock Number 2990-00-659-6909, 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 4 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-00-659-6909 |
| Primary Part Number | 056193 |
| Item Name | Pipe,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| Nominal Overall Length | 22.000 INCHES IN |
| Wall Thickness | 0.0700 INCHES NOMINAL IN |
| Nominal Outside Diameter | 1.875 INCHES IN |
| Material | STEEL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 2990-00-659-6909 is a Pipe,exhaust, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-00-659-6909 has 2 manufacturer part numbers on file: 056193 (Caterpillar Inc Div Caterpillar Defense), 56193 (Mitsubishi Caterpillar Forklift America, Inc).
1 possible match (shared part number, not a government interchangeability claim): 5120-01-477-8905. Verify interchangeability with system specifications before substitution.
Key specifications for 056193: Nominal Overall Length: 22.000 INCHES IN; Wall Thickness: 0.0700 INCHES NOMINAL IN; Nominal Outside Diameter: 1.875 INCHES IN; Material: STEEL. 4 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.