The Screw,close Tolerance, cataloged under National Stock Number 5305-01-338-7306, 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 22 specifications, cited from the U.S. Government catalog. The record lists 7 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-338-7306 |
| Primary Part Number | ST3M652C3-4A |
| 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 GRIP |
| Surface Finish | 32.0 MICROINCHES BEARING SURFACE OF HEAD |
| Fastener Length | 0.390 INCHES MINIMUM AND 0.437 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.130 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN |
| Material Document and Classification | 23-112,TY C CAGEC 76301 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Features Provided | CETYL ALCOHOL LUBRICANT AND O RING |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN |
| Grip Diameter | 0.1890 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 125000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.3765 INCHES MINIMUM AND 0.3813 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 |
|---|---|
| HT4020-3-4A | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M652C3-4A PRIMARY | The Boeing Company Div Defense (USA) |
| HT4020-3-4A | Huck International, Inc (USA) |
| ST3M652C3-4A | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT4020-3-4A | Hi-Shear Corporation (USA) |
| HT4020-3-4A | Howmet Global Fastening Systems Inc (USA) |
| WC4020-3-4A | West Coast Aerospace, Inc. (USA) |
| Reference | Meaning |
|---|---|
| CHT4020-3-4A | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| HT4020-3-4A | 5/2 Secondary reference U.S. Government activity |
| CHT4020-3-4A | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| CHT4020-3-4A | C/1 Advisory reference — outside the item-of-supply concept Deutsch Co the |
| HT4020-3-4A | 5/9 Secondary reference U.S. Government activity |
| HT4020-3-4A | 5/2 Secondary reference U.S. Government activity |
NSN 5305-01-338-7306 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-338-7306 has 7 manufacturer part numbers on file: HT4020-3-4A (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M652C3-4A (The Boeing Company Div Defense), HT4020-3-4A (Huck International, Inc), ST3M652C3-4A (Fastener Innovation Technology, Inc. Dba F I T), HT4020-3-4A (Hi-Shear Corporation) and 2 more.
Key specifications for ST3M652C3-4A: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Surface Finish: 32.0 MICROINCHES BEARING SURFACE OF HEAD; Fastener Length: 0.390 INCHES MINIMUM AND 0.437 INCHES MAXIMUM IN. 22 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.