The Screw,close Tolerance, cataloged under National Stock Number 5305-01-044-2244, 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 18 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through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-044-2244 |
| Primary Part Number | ST3M652C4-9D |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 32.0 MICROINCHES BEARING SURFACE OF HEAD |
| Head Height | 0.071 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN |
| Fastener Length | 1.015 INCHES MINIMUM AND 1.062 INCHES MAXIMUM IN |
| Thread Length | 0.443 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.552 INCHES MINIMUM AND 0.572 INCHES MAXIMUM IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.502 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 |
|---|---|
| ST3M652C4-9D | Huck International, Inc (USA) |
| HT4020-4-9 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| HT4020-4-9 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M652C4-9D PRIMARY | The Boeing Company Div Defense (USA) |
| ST3M652C4-9D | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| HT4020-4-9 | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| HT4020-4-9 | 5/9 Secondary reference U.S. Government activity |
| ST3M652C4-9D | 5/2 Secondary reference U.S. Government activity |
| ST3M652C4-9D | 5/2 Secondary reference U.S. Government activity |
| CHT4020 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| CHT4020 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| HT4020-4-9 | 7/2 Vendor item drawing reference Huck International, Inc |
| CHT4020 | C/1 Advisory reference — outside the item-of-supply concept Deutsch Co the |
| HT4020-4-9 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-044-2244 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-044-2244 has 6 manufacturer part numbers on file: ST3M652C4-9D (Huck International, Inc), HT4020-4-9 (Sps Technologies, Llc Dba PB Fasteners), HT4020-4-9 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M652C4-9D (The Boeing Company Div Defense), ST3M652C4-9D (Sps Technologies Ltd, Tj Brooks Division) and 1 more.
Key specifications for ST3M652C4-9D: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES BEARING SURFACE OF HEAD; Head Height: 0.071 INCHES MINIMUM AND 0.073 INCHES MAXIMUM IN; Fastener Length: 1.015 INCHES MINIMUM AND 1.062 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.