The Screw,close Tolerance, cataloged under National Stock Number 5305-01-494-8094, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 15 specifications, cited from the U.S. Government catalog. The record lists 8 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5305-01-494-8094 |
| Primary Part Number | ST3M652C4-14D |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.0713 INCHES MINIMUM AND 0.0733 INCHES MAXIMUM IN |
| Fastener Length | 1.328 INCHES MINIMUM AND 1.375 INCHES MAXIMUM IN |
| Thread Length | 0.469 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.2500 INCHES IN |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.865 INCHES MINIMUM AND 0.885 INCHES MAXIMUM IN |
| Grip Diameter | 0.2490 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 CORROSION RESISTING OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.5018 INCHES MINIMUM AND 0.5066 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 |
|---|---|
| WC4020-4-14 | West Coast Aerospace, Inc. (USA) |
| HT4020-4-14 | Hi-Shear Corporation (USA) |
| HT4020-4-14 | Huck International, Inc (USA) |
| HT4020-4-14 | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| HT4020-4-14 | Howmet Global Fastening Systems Inc (USA) |
| ST3M652C4-14D | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT4020-4-14 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M652C4-14D PRIMARY | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| HT4020-4-14 | 5/2 Secondary reference U.S. Government activity |
NSN 5305-01-494-8094 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-494-8094 has 8 manufacturer part numbers on file: WC4020-4-14 (West Coast Aerospace, Inc.), HT4020-4-14 (Hi-Shear Corporation), HT4020-4-14 (Huck International, Inc), HT4020-4-14 (Sps Technologies Ltd, Tj Brooks Division), HT4020-4-14 (Howmet Global Fastening Systems Inc) and 3 more.
Key specifications for ST3M652C4-14D: Head Height: 0.0713 INCHES MINIMUM AND 0.0733 INCHES MAXIMUM IN; Fastener Length: 1.328 INCHES MINIMUM AND 1.375 INCHES MAXIMUM IN; Thread Length: 0.469 INCHES NOMINAL IN; Nominal Thread Diameter: 0.2500 INCHES IN. 15 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.