The Installing Tool, cataloged under National Stock Number 5120-01-164-7331, is classified within Federal Supply Class 5120 (Hand Tools, Nonedged, Nonpowered) of the Hand Tools group. The manufacturer of record is Southco Manufacturing Ltd. 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5120-01-164-7331 |
| Primary Part Number | FRST4 |
| Item Name | Installing Tool |
| FSC / FSG | 5120 / 51 — Hand Tools, Nonedged, Nonpowered |
| Manufacturer | Southco Manufacturing Ltd |
| Status | ACTIVE |
| General Characteristics Item Description | NO. 4 FASTNER RETAINER SPRING AND RINGS; CORROSION RESISTENT STEEL-CADMIUM PLATED |
| 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 |
|---|---|
| FRST4 | Southco Manufacturing Ltd (GBR) |
| Reference | Meaning |
|---|---|
| 10096571 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| TFRS4 | 5/9 Secondary reference Southco Inc |
| RJ40001390 | 3/9 Design control — primary reference Southco Inc |
| FRST4 | 5/9 Secondary reference Southco Inc |
| T-525 | 5/9 Secondary reference Southco Inc |
NSN 5120-01-164-7331 is a Installing Tool, manufactured by Southco Manufacturing Ltd, classified under FSC 5120, Hand Tools, Nonedged, Nonpowered. Status: active.
NSN 5120-01-164-7331 has 1 manufacturer part number on file: FRST4 (Southco Manufacturing Ltd).
Key specifications for FRST4: General Characteristics Item Description: NO. 4 FASTNER RETAINER SPRING AND RINGS; CORROSION RESISTENT STEEL-CADMIUM PLATED. 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.