The Screw,close Tolerance, cataloged under National Stock Number 5305-01-681-7791, 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 5 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-681-7791 |
| Primary Part Number | HT8137-4-7ASM |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Head Height | 0.0733 INCHES NOMINAL IN |
| Countersink Angle | 100.0000 DEGREES NOMINAL |
| Material | TITANIUM OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.5066 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 |
|---|---|
| HT8137-4-7ASM PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| HT271A4-7AM PRIMARY | Hi-Shear Corporation (USA) |
| BM33024V-4-7UM PRIMARY | Huck International, Inc (USA) |
| Reference | Meaning |
|---|---|
| ST3M430V4-7ASM | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
NSN 5305-01-681-7791 is a Screw,close Tolerance, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-681-7791 has 3 manufacturer part numbers on file: HT8137-4-7ASM (Howmet Global Fastening Systems Inc), HT271A4-7AM (Hi-Shear Corporation), BM33024V-4-7UM (Huck International, Inc).
Key specifications for HT8137-4-7ASM: Head Height: 0.0733 INCHES NOMINAL IN; Countersink Angle: 100.0000 DEGREES NOMINAL; End Item Identification: F-15SA; Material: TITANIUM OVERALL. 5 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.