The Countersink, cataloged under National Stock Number 5133-01-684-5825, 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 Brown Aviation Tool Supply Co. Dba Brown Aviation Tool Supply Co.. Government technical data includes 10 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.
| Parameter | Value |
|---|---|
| NSN | 5133-01-684-5825 |
| Primary Part Number | CCO21-CT |
| Item Name | Countersink |
| FSC / FSG | 5133 / 51 — Drill Bits, Counterbores, and Countersinks: Hand and Machine |
| Manufacturer | Brown Aviation Tool Supply Co. Dba Brown Aviation Tool Supply Co. |
| Status | ACTIVE |
| Body Diameter | 0.500 MILLIMETERS NOMINAL MM |
| Cutting End Style | SOLID |
| Material Document and Classification | MANUFACTURE REFERENCE MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.098 MILLIMETERS MM |
| Cutting Rotation Direction | RIGHT-HAND |
| Pilot Diameter | 0.159 MILLIMETERS NOMINAL MM |
| Shank Style | EXTERNALLY THREADED |
| Flute Quantity | 3 |
| Material | STEEL OVERALL |
| Thread Quantity | 28 PER INCH |
| 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 |
|---|---|
| CCO21-CT PRIMARY | Brown Aviation Tool Supply Co. Dba Brown Aviation Tool Supply Co. (USA) |
NSN 5133-01-684-5825 is a Countersink, manufactured by Brown Aviation Tool Supply Co. Dba Brown Aviation Tool Supply Co., classified under FSC 5133, Drill Bits, Counterbores, and Countersinks: Hand and Machine. Status: active.
NSN 5133-01-684-5825 has 1 manufacturer part number on file: CCO21-CT (Brown Aviation Tool Supply Co. Dba Brown Aviation Tool Supply Co.).
Key specifications for CCO21-CT: Body Diameter: 0.500 MILLIMETERS NOMINAL MM; Cutting End Style: SOLID; Material Document and Classification: MANUFACTURE REFERENCE MFR REF SINGLE MATERIAL RESPONSE OVERALL; Nominal Thread Diameter: 0.098 MILLIMETERS MM. 10 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.