The Differential Gear Unit, cataloged under National Stock Number 3040-01-188-1280, is classified within Federal Supply Class 3040 (Miscellaneous Power Transmission Equipment) of the Mechanical Power Transmission Equipment group. The manufacturer of record is Designatronics Incorporated Div Sterling Instruments Div. 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3040-01-188-1280 |
| Primary Part Number | S9540AR0040 |
| Item Name | Differential Gear Unit |
| FSC / FSG | 3040 / 30 — Miscellaneous Power Transmission Equipment |
| Manufacturer | Designatronics Incorporated Div Sterling Instruments Div |
| Status | ACTIVE |
| Nominal Overall Length | 2.156 INCHES 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 |
|---|---|
| S9540AR0040 PRIMARY | Designatronics Incorporated Div Sterling Instruments Div (USA) |
| Reference | Meaning |
|---|---|
| 3252-81180 | D/9 Drawing number reference only Honeywell International Inc. Dba Honeywell International |
| SI168 | C/1 Advisory reference — outside the item-of-supply concept Superite Gear and Instrument Corp |
| 3252-81180 | 5/9 Secondary reference Designatronics Incorporated Div Sterling Instruments Div |
NSN 3040-01-188-1280 is a Differential Gear Unit, manufactured by Designatronics Incorporated Div Sterling Instruments Div, classified under FSC 3040, Miscellaneous Power Transmission Equipment. Status: active.
NSN 3040-01-188-1280 has 1 manufacturer part number on file: S9540AR0040 (Designatronics Incorporated Div Sterling Instruments Div).
Key specifications for S9540AR0040: Nominal Overall Length: 2.156 INCHES IN; Special Features: SHAFT, END GEARS AND PINION, CORROSION RESISTANT STEEL; SHAFT: 1ST END OUTSIDE DIAMETER 0.1247 INCHES, LENGTH 0.449 INCHES, 2ND END OUTSIDE DIAMETER 0.1247 INCHES, LENGTH 0.645 INCHES; OVERALL DIAMETER 0.875 INCHES IN. 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.