The Tap,thread Cutting, cataloged under National Stock Number 5136-01-647-3979, is classified within Federal Supply Class 5136 (Taps, Dies, and Collets; Hand and Machine) of the Hand Tools group. The manufacturer of record is Ritchie Engineering Co Inc. The record lists 1 manufacturer part number 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 | 5136-01-647-3979 |
| Primary Part Number | 18978 |
| Item Name | Tap,thread Cutting |
| FSC / FSG | 5136 / 51 — Taps, Dies, and Collets; Hand and Machine |
| Manufacturer | Ritchie Engineering Co Inc |
| Status | ACTIVE |
| 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 |
|---|---|
| 18978 PRIMARY | Ritchie Engineering Co Inc (USA) |
NSN 5136-01-647-3979 is a Tap,thread Cutting, manufactured by Ritchie Engineering Co Inc, classified under FSC 5136, Taps, Dies, and Collets; Hand and Machine. Status: active.
NSN 5136-01-647-3979 has 1 manufacturer part number on file: 18978 (Ritchie Engineering Co Inc).
1 possible match (shared part number, not a government interchangeability claim): 6150-01-657-0249. Verify interchangeability with system specifications before substitution.
Key specifications for 18978: Part Name Assigned by Controlling Agency: SCHRADER, RETHREADING ACCESSORY. 0 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.