The Screw,tapping, cataloged under National Stock Number 5305-01-591-0640, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Mcmaster-Carr Supply Co. Government technical data includes 8 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-591-0640 |
| Primary Part Number | 93406A148 |
| Item Name | Screw,tapping |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Mcmaster-Carr Supply Co |
| Status | ACTIVE |
| Nonmachine Nominal Thread Diameter | 0.138 INCHES IN |
| Head Height | 0.086 INCHES NOMINAL IN |
| Fastener Length | 0.500 INCHES NOMINAL IN |
| Nonmachine Thread Style | CONE POINT (TYPE BP) |
| Head Style | TRUSS |
| Internal Drive Style | CROSS RECESS TYPE 1 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Head Diameter | 0.321 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 |
|---|---|
| 93406A148 | Mcmaster-Carr Supply Co (USA) |
| Reference | Meaning |
|---|---|
| 1-PTA-6-50 | 3/2 Design control — primary reference U.S. Government activity |
| 235-C2575-1 | 7/2 Vendor item drawing reference Northrop Grumman Systems Corporation |
NSN 5305-01-591-0640 is a Screw,tapping, manufactured by Mcmaster-Carr Supply Co, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-591-0640 has 1 manufacturer part number on file: 93406A148 (Mcmaster-Carr Supply Co).
Key specifications for 93406A148: Nonmachine Nominal Thread Diameter: 0.138 INCHES IN; Head Height: 0.086 INCHES NOMINAL IN; Fastener Length: 0.500 INCHES NOMINAL IN; Nonmachine Thread Style: CONE POINT (TYPE BP). 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.