The Screw,close Tolerance, cataloged under National Stock Number 5305-01-494-8241, 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 12 specifications, cited from the U.S. Government catalog. The record lists 6 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-494-8241 |
| Primary Part Number | ST3M652C6-18D |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.1147 INCHES MINIMUM AND 0.1167 INCHES MAXIMUM IN |
| Fastener Length | 1.297 INCHES MINIMUM AND 1.807 INCHES MAXIMUM IN |
| Thread Length | 0.625 INCHES MINIMUM AND 0.672 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.3750 INCHES IN |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM IN |
| Grip Diameter | 0.3740 INCHES MINIMUM AND 0.3745 INCHES MAXIMUM IN |
| Internal Drive Style | HIGH-TORQUE |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Head Diameter | 0.7556 INCHES MINIMUM AND 0.7604 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 |
|---|---|
| HT4020-6-18 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M652C6-18D PRIMARY | The Boeing Company Div Defense (USA) |
| HT4020-6-18 | Hi-Shear Corporation (USA) |
| HT4020-6-18 | Huck International, Inc (USA) |
| 11925C6-18D | Reid Products Inc. Dba Reid Products Inc (USA) |
| HT4020-6-18 | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| Reference | Meaning |
|---|---|
| HT4020-6-18 | 5/9 Secondary reference Sps Technologies Inc |
| HT4020-6-18 | 5/2 Secondary reference U.S. Government activity |
| HT4020-6-18 | 5/2 Secondary reference U.S. Government activity |
| HT4020-6-18 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-494-8241 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-494-8241 has 6 manufacturer part numbers on file: HT4020-6-18 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M652C6-18D (The Boeing Company Div Defense), HT4020-6-18 (Hi-Shear Corporation), HT4020-6-18 (Huck International, Inc), 11925C6-18D (Reid Products Inc. Dba Reid Products Inc) and 1 more.
Key specifications for ST3M652C6-18D: Head Height: 0.1147 INCHES MINIMUM AND 0.1167 INCHES MAXIMUM IN; Fastener Length: 1.297 INCHES MINIMUM AND 1.807 INCHES MAXIMUM IN; Thread Length: 0.625 INCHES MINIMUM AND 0.672 INCHES MAXIMUM IN; Nominal Thread Diameter: 0.3750 INCHES IN. 12 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.