The Countersink, cataloged under National Stock Number 5133-00-540-6691, 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 Northwest Tool Corp. Government technical data includes 12 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5133-00-540-6691 |
| Primary Part Number | 5133-00-540-6691 |
| Item Name | Countersink |
| FSC / FSG | 5133 / 51 — Drill Bits, Counterbores, and Countersinks: Hand and Machine |
| Manufacturer | Northwest Tool Corp |
| Status | ACTIVE |
| Shank Diameter | 0.245 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN |
| Body Diameter | 0.432 INCHES MINIMUM AND 0.442 INCHES MAXIMUM IN |
| Point Diameter | 0.125 INCHES NOMINAL IN |
| Cutting End Style | STRAIGHT FLUTE BLUNT END |
| Hardness Rating | 62.0 ROCKWELL C MINIMUM AND 65.0 ROCKWELL C MAXIMUM |
| Cutting Rotation Direction | RIGHT-HAND |
| Features Provided | INTEGRAL PILOT |
| Pilot Diameter | 0.125 INCHES NOMINAL IN |
| Shank Style | STRAIGHT ROUND |
| Flute Quantity | 2 |
| Included Angle | 100.0 DEGREES NOMINAL |
| Material | STEEL OVERALL |
| 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 |
|---|---|
| 5133-00-540-6691 | Northwest Tool Corp (USA) |
| Reference | Meaning |
|---|---|
| GGG-C-613 | 5/9 Secondary reference U.S. Government activity |
| GGG-C-613 TY6NRA | 5/9 Secondary reference U.S. Government activity |
| 2020 | 5/9 Secondary reference Howmet Global Fastening Systems Inc. Div Tridair Products |
| 5133-00-540-6691 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5133-00-540-6691 is a Countersink, manufactured by Northwest Tool Corp, classified under FSC 5133, Drill Bits, Counterbores, and Countersinks: Hand and Machine. Status: active.
NSN 5133-00-540-6691 has 1 manufacturer part number on file: 5133-00-540-6691 (Northwest Tool Corp).
Key specifications for 5133-00-540-6691: Shank Diameter: 0.245 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN; Body Diameter: 0.432 INCHES MINIMUM AND 0.442 INCHES MAXIMUM IN; Point Diameter: 0.125 INCHES NOMINAL IN; Cutting End Style: STRAIGHT FLUTE BLUNT END. 12 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.