The Indicator,backlash, cataloged under National Stock Number 5120-01-509-3199, is classified within Federal Supply Class 5120 (Hand Tools, Nonedged, Nonpowered) of the Hand Tools group. Government technical data includes 1 specification, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5120-01-509-3199 |
| Item Name | Indicator,backlash |
| FSC / FSG | 5120 / 51 — Hand Tools, Nonedged, Nonpowered |
| Status | ACTIVE |
| Functional Description | USED TO CHECK GEAR BACKLASH ON UNITS WITH 14/28 TOOTH COUNT AND GEAR HOUSING |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 91-78473 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5120-01-509-3199 is a Indicator,backlash, classified under FSC 5120, Hand Tools, Nonedged, Nonpowered. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 6620-01-589-5411. Verify interchangeability with system specifications before substitution.
Key specifications for 5120-01-509-3199: Functional Description: USED TO CHECK GEAR BACKLASH ON UNITS WITH 14/28 TOOTH COUNT AND GEAR HOUSING; End Item Identification: MERCURY MARINE ALPHA DRIVE UNITS. 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.