The Gage Rod,liquid Level, cataloged under National Stock Number 6680-01-557-4540, 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 Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6680-01-557-4540 |
| Primary Part Number | B3631M |
| Item Name | Gage Rod,liquid Level |
| FSC / FSG | 6680 / 66 — Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments |
| Manufacturer | Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic |
| Status | ACTIVE |
| Scale Inscription | FULL AND LOW |
| Material Document and Classification | FED STD 66, SAE 1050 TO 1075 FED STD SINGLE MATERIAL RESPONSE |
| Material | STEEL |
| Distance From Rod End to Scale Graduation | 1.240 INCHES NOMINAL IN |
| 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 |
|---|---|
| B3631M PRIMARY | Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic (USA) |
| Reference | Meaning |
|---|---|
| B3631 THRU -U | D/9 Drawing number reference only Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic |
NSN 6680-01-557-4540 is a Gage Rod,liquid Level, manufactured by Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic, classified under FSC 6680, Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments. Status: active.
NSN 6680-01-557-4540 has 1 manufacturer part number on file: B3631M (Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic).
Key specifications for B3631M: Scale Inscription: FULL AND LOW; Material Document and Classification: FED STD 66, SAE 1050 TO 1075 FED STD SINGLE MATERIAL RESPONSE; Overall Length: 13.520 INCHES NOMINAL IN; Overall Width: 0.640 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.