The Sensor,exhaust Gas,oxygen,emissi, cataloged under National Stock Number 2990-01-727-4273, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Pem-Tech, Inc. Dba Pem-Tech Inc. Government technical data includes 1 specification, 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-01-727-4273 |
| Primary Part Number | S-121 |
| Item Name | Sensor,exhaust Gas,oxygen,emissi |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Pem-Tech, Inc. Dba Pem-Tech Inc |
| Status | ACTIVE |
| Vehicle Design Control Activity | 1MSW1 |
| 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 |
|---|---|
| S-121 PRIMARY | Pem-Tech, Inc. Dba Pem-Tech Inc (USA) |
NSN 2990-01-727-4273 is a Sensor,exhaust Gas,oxygen,emissi, manufactured by Pem-Tech, Inc. Dba Pem-Tech Inc, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-01-727-4273 has 1 manufacturer part number on file: S-121 (Pem-Tech, Inc. Dba Pem-Tech Inc).
Key specifications for S-121: Vehicle Design Control Activity: 1MSW1; Special Features: MATERIAL: 316 STAINLESS STEEL; LENGTH: 2.00INCH; 1ST END: 0.75-14NPT, 0.75INCH LONG; ACROSS FLATS 1.125 INCH; 2ND END: 1.25-20 2A, 0.50INCH LONG; DIAMETER: 1.25INCH; A; Part Name Assigned by Controlling Agency: S-121 LEL SENSOR HEAD ASSEMBLY. 1 specification is 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.