The Screw,close Tolerance, cataloged under National Stock Number 5305-01-015-6644, 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 18 specifications, cited from the U.S. Government catalog. The record lists 5 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-015-6644 |
| Primary Part Number | S5008-4-6 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Head Height | 0.015 INCHES MAXIMUM IN |
| Fastener Length | 0.814 INCHES MINIMUM AND 0.844 INCHES MAXIMUM IN |
| Thread Length | 0.444 INCHES MINIMUM AND 0.494 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FILLISTER COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.350 INCHES MINIMUM AND 0.370 INCHES MAXIMUM IN |
| Grip Diameter | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.3898 INCHES MINIMUM AND 0.3948 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 |
|---|---|
| S5008-4-6 | Huck International, Inc (USA) |
| S5008-4-6 | Hi-Shear Corporation (USA) |
| S5008-4-6 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| S5008-4-6 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| S5008-4-6 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| Reference | Meaning |
|---|---|
| S5008-4-6 | 5/9 Secondary reference U.S. Government activity |
| S5008-4-6 | 5/9 Secondary reference U.S. Government activity |
| S5008-4-6 | C/1 Advisory reference — outside the item-of-supply concept Northrop Grumman Systems Corporation |
| S5008-4-6 | 5/9 Secondary reference Northrop Grumman Systems Corporation |
NSN 5305-01-015-6644 is a Screw,close Tolerance, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-015-6644 has 5 manufacturer part numbers on file: S5008-4-6 (Huck International, Inc), S5008-4-6 (Hi-Shear Corporation), S5008-4-6 (Howmet Global Fastening Systems Inc), S5008-4-6 (Sps Technologies, Llc Dba PB Fasteners), S5008-4-6 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc).
Key specifications for S5008-4-6: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Head Height: 0.015 INCHES MAXIMUM IN; Fastener Length: 0.814 INCHES MINIMUM AND 0.844 INCHES MAXIMUM IN. 18 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.