The Screw,close Tolerance, cataloged under National Stock Number 5305-01-061-7428, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. Government technical data includes 10 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-061-7428 |
| Primary Part Number | HT8138-4-6T |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Fastener Length | 0.785 INCHES MINIMUM AND 0.832 INCHES MAXIMUM IN |
| Thread Length | 0.400 INCHES MINIMUM AND 0.467 INCHES MAXIMUM IN |
| Shank Unthreaded Hole Diameter | 0.076 INCHES MINIMUM AND 0.086 INCHES MAXIMUM FIRST HOLE IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN |
| Grip Diameter | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Head Diameter | 0.475 INCHES MINIMUM AND 0.507 INCHES MAXIMUM 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 |
|---|---|
| HT8138-4-6T PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| BM19051-4-6 PRIMARY | Huck International, Inc (USA) |
| A146-4-6T PRIMARY | Huck International, Inc (USA) |
| Reference | Meaning |
|---|---|
| BM19051-4-6 | 5/9 Secondary reference U.S. Government activity |
| GB510AE4-6T | 5/9 Secondary reference Northrop Grumman Systems Corporation |
| HT8138-4-6T | 5/9 Secondary reference U.S. Government activity |
| A146-4-6T | 5/9 Secondary reference U.S. Government activity |
| 106712-4-6T | 3/2 Design control — primary reference U.S. Government activity |
| NAS1580A4H6D | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-061-7428 is a Screw,close Tolerance, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-061-7428 has 3 manufacturer part numbers on file: HT8138-4-6T (Howmet Global Fastening Systems Inc), BM19051-4-6 (Huck International, Inc), A146-4-6T (Huck International, Inc).
Key specifications for HT8138-4-6T: Fastener Length: 0.785 INCHES MINIMUM AND 0.832 INCHES MAXIMUM IN; Thread Length: 0.400 INCHES MINIMUM AND 0.467 INCHES MAXIMUM IN; Shank Unthreaded Hole Diameter: 0.076 INCHES MINIMUM AND 0.086 INCHES MAXIMUM FIRST HOLE IN; Head Style: FLAT COUNTERSUNK. 10 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.