The Compensator,liquid Quantity Gage, cataloged under National Stock Number 6680-01-059-3387, is classified within Federal Supply Class 6680 (Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments) of the Instruments and Laboratory Equipment group. The manufacturer of record is Firstmark Aerospace Corp. Government technical data includes 4 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 6680-01-059-3387 |
| Primary Part Number | FG450A51 |
| Item Name | Compensator,liquid Quantity Gage |
| FSC / FSG | 6680 / 66 — Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments |
| Manufacturer | Firstmark Aerospace Corp |
| Status | ACTIVE |
| Contact Type | THREADED STUD |
| Electrical Connection Quantity | 5 |
| Overall Diameter | 3.570 INCHES MAXIMUM IN |
| Contact Quantity | 5 |
| 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 |
|---|---|
| FG450A51 PRIMARY | Firstmark Aerospace Corp (USA) |
| Reference | Meaning |
|---|---|
| FG450A-51 | 5/2 Secondary reference U.S. Government activity |
| 695799-185 | D/9 Drawing number reference only U.S. Government activity |
| FG450A51 | 5/9 Secondary reference U.S. Government activity |
NSN 6680-01-059-3387 is a Compensator,liquid Quantity Gage, manufactured by Firstmark Aerospace Corp, classified under FSC 6680, Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments. Status: active.
NSN 6680-01-059-3387 has 1 manufacturer part number on file: FG450A51 (Firstmark Aerospace Corp).
1 possible match (shared part number, not a government interchangeability claim): 6680-01-396-1605. Verify interchangeability with system specifications before substitution.
Key specifications for FG450A51: Contact Type: THREADED STUD; Electrical Connection Quantity: 5; Overall Diameter: 3.570 INCHES MAXIMUM IN; Overall Length: 28.980 INCHES NOMINAL IN. 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.