The Counterbore,machine, cataloged under National Stock Number 5133-00-595-8256, 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 Greenfield Industries Inc. Government technical data includes 8 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5133-00-595-8256 |
| Primary Part Number | C46425 |
| Item Name | Counterbore,machine |
| FSC / FSG | 5133 / 51 — Drill Bits, Counterbores, and Countersinks: Hand and Machine |
| Manufacturer | Greenfield Industries Inc |
| Status | ACTIVE |
| Shank Diameter | 0.297 INCHES NOMINAL IN |
| Cutting End Style | INTERCHANGEABLE PILOT |
| Nominal Cutting Diameter | 0.3125 INCHES IN |
| Features Provided | REPLACEABLE PILOT |
| Shank Style | STRAIGHT ROUND |
| Pilot Hole Nominal Diameter | 0.094 INCHES IN |
| Flute Quantity | 3 |
| 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 |
|---|---|
| C46425 PRIMARY | Greenfield Industries Inc (USA) |
| 879 5/16 | Greenfield Industries Inc (USA) |
| Reference | Meaning |
|---|---|
| 50702 | 5/9 Secondary reference Lear Siegler Inc National Twist Drill and Tool Div |
| 879 5/16 | 5/9 Secondary reference Kennametal Inc. Div Kennametal Industrial Products Group |
| C46425 | 5/9 Secondary reference Kennametal Inc. Div Kennametal Industrial Products Group |
| 879 5/16 | 5/9 Secondary reference Cleveland Twist Drill Co Div of Greenfield Industries Inc |
| 3000-0312 | 5/9 Secondary reference Cleveland Twist Drill Co Div of Greenfield Industries Inc |
NSN 5133-00-595-8256 is a Counterbore,machine, manufactured by Greenfield Industries Inc, classified under FSC 5133, Drill Bits, Counterbores, and Countersinks: Hand and Machine. Status: active.
NSN 5133-00-595-8256 has 2 manufacturer part numbers on file: C46425 (Greenfield Industries Inc), 879 5/16 (Greenfield Industries Inc).
3 possible matches (shared part number, not a government interchangeability claim): 5330-01-278-6492, 4820-01-300-0568, 5310-01-680-2619. Verify interchangeability with system specifications before substitution.
Key specifications for C46425: Shank Diameter: 0.297 INCHES NOMINAL IN; Cutting End Style: INTERCHANGEABLE PILOT; Overall Length: 3.812 INCHES NOMINAL IN; Nominal Cutting Diameter: 0.3125 INCHES IN. 8 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.