The Die,rethreading, cataloged under National Stock Number 5136-01-649-0851, is classified within Federal Supply Class 5136 (Taps, Dies, and Collets; Hand and Machine) of the Hand Tools group. The manufacturer of record is Kastar Hand Tools. Government technical data includes 6 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. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5136-01-649-0851 |
| Primary Part Number | 51-2640 |
| Item Name | Die,rethreading |
| FSC / FSG | 5136 / 51 — Taps, Dies, and Collets; Hand and Machine |
| Manufacturer | Kastar Hand Tools |
| Status | ACTIVE |
| Width Across Flats | 0.500 INCHES NOMINAL IN |
| Style Designator | SOLID HEXAGON NUT |
| Thread Direction | RIGHT-HAND |
| Material | STEEL OVERALL |
| Thread Size and Series/type Designator | 0.250-28 UNF |
| Thickness | 0.250 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 |
|---|---|
| 51-2640 PRIMARY | Kastar Hand Tools (USA) |
| 51-2640-0005 | Kastar Hand Tools (USA) |
NSN 5136-01-649-0851 is a Die,rethreading, manufactured by Kastar Hand Tools, classified under FSC 5136, Taps, Dies, and Collets; Hand and Machine. Status: active.
NSN 5136-01-649-0851 has 2 manufacturer part numbers on file: 51-2640 (Kastar Hand Tools), 51-2640-0005 (Kastar Hand Tools).
1 possible match (shared part number, not a government interchangeability claim): 5330-01-649-9563. Verify interchangeability with system specifications before substitution.
Key specifications for 51-2640: Width Across Flats: 0.500 INCHES NOMINAL IN; Style Designator: SOLID HEXAGON NUT; Thread Direction: RIGHT-HAND; End Item Identification: SATS. 6 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.