The Cutter,countersink, cataloged under National Stock Number 5133-00-062-5294, 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 Martin Aircraft Tool Company. Government technical data includes 11 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5133-00-062-5294 |
| Primary Part Number | MM305-3-1/2-100-40 |
| Item Name | Cutter,countersink |
| FSC / FSG | 5133 / 51 — Drill Bits, Counterbores, and Countersinks: Hand and Machine |
| Manufacturer | Martin Aircraft Tool Company |
| Status | ACTIVE |
| Body Diameter | 0.500 INCHES NOMINAL IN |
| Cutting End Style | STRAIGHT FLUTE BLUNT END |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Features Provided | INTEGRAL PILOT |
| Pilot Diameter | 0.098 INCHES NOMINAL IN |
| Shank Style | EXTERNALLY THREADED |
| Flute Quantity | 2 |
| Included Angle | 100.0 DEGREES NOMINAL |
| Material | STEEL OVERALL |
| Thread Series Designator | UNF |
| 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 |
|---|---|
| MM305-3-1/2-100-40 PRIMARY | Martin Aircraft Tool Company (USA) |
| Reference | Meaning |
|---|---|
| A-A-58076 | 4/1 Identification reference Federal Commercial Item Description Promulgated by General Services Administration Washington DC |
| CA4250 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5133-00-062-5294 is a Cutter,countersink, manufactured by Martin Aircraft Tool Company, classified under FSC 5133, Drill Bits, Counterbores, and Countersinks: Hand and Machine. Status: active.
NSN 5133-00-062-5294 has 1 manufacturer part number on file: MM305-3-1/2-100-40 (Martin Aircraft Tool Company).
Key specifications for MM305-3-1/2-100-40: Body Diameter: 0.500 INCHES NOMINAL IN; Cutting End Style: STRAIGHT FLUTE BLUNT END; Overall Length: 1.093 INCHES NOMINAL IN; Nominal Thread Diameter: 0.250 INCHES IN. 11 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.