The Countersink, cataloged under National Stock Number 5133-01-439-3552, is classified within Federal Supply Class 5133 (Drill Bits, Counterbores, and Countersinks: Hand and Machine) of the Hand Tools group. The manufacturer of record is Us Air Tool Co., Inc.. Government technical data includes 2 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. Current acquisition status: Active.
| Item Name | Countersink |
| FSC / FSG | 5133 — Drill Bits, Counterbores, and Countersinks: Hand and Machine (FSG 51) |
| Manufacturers | Us Air Tool Co., Inc. (CAGE 58150) |
| Parameter | Value |
|---|---|
| NSN | 5133-01-439-3552 |
| Primary Part Number | 53-401-3 |
| Item Name | Countersink |
| FSC / FSG | 5133 / 51 — Drill Bits, Counterbores, and Countersinks: Hand and Machine |
| Manufacturer | Us Air Tool Co., Inc. |
| Status | ACTIVE |
| Features Provided | INTEGRAL PILOT |
| Pilot Diameter | 0.094 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 |
|---|---|
| 53-401-3 PRIMARY | Us Air Tool Co., Inc. (USA) |
NSN 5133-01-439-3552 is a Countersink, manufactured by Us Air Tool Co., Inc., classified under FSC 5133, Drill Bits, Counterbores, and Countersinks: Hand and Machine. Status: active.
NSN 5133-01-439-3552 has 1 manufacturer part number on file: 53-401-3 (Us Air Tool Co., Inc.).
Key specifications for 53-401-3: Features Provided: INTEGRAL PILOT; Pilot Diameter: 0.094 INCHES NOMINAL IN. 2 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.