The Screw,close Tolerance, cataloged under National Stock Number 5305-01-579-8731, 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 16 specifications, cited from the U.S. Government catalog. The record lists 15 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-579-8731 |
| Primary Part Number | ST3M652C6-22A |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.115 INCHES MINIMUM AND 0.117 INCHES MAXIMUM IN |
| Fastener Length | 2.016 INCHES NOMINAL IN |
| Thread Length | 0.641 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.375 INCHES NOMINAL IN |
| Grip Diameter | 0.374 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.756 INCHES MINIMUM AND 0.760 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 |
|---|---|
| ST3M652C6-22A | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M652C6-22A | Reid Products Inc. Dba Reid Products Inc (USA) |
| ST3M652C6-22A | Heartland Precision Fasteners Inc (USA) |
| ST3M652C6-22A | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| ST3M652C6-22A | Huck International, Inc (USA) |
| ST3M652C6-22A | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M652C6-22A PRIMARY | The Boeing Company Div Defense (USA) |
| ST3M652C6-22A | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M652C6-22A | Houston Precision Fasteners I Lp (USA) |
| ST3M652C6-22A | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M652C6-22A | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M652C6-22A | Howmet Global Fastening Systems Inc (USA) |
| ST3M652C6-22A | West Coast Aerospace, Inc. (USA) |
| ST3M652C6-22A | Hi-Shear Corporation (USA) |
| ST3M652C6-22A | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| Reference | Meaning |
|---|---|
| ST3M652C6-22A | 5/2 Secondary reference U.S. Government activity |
| ST3M652C6-22A | 5/2 Secondary reference U.S. Government activity |
NSN 5305-01-579-8731 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-579-8731 has 15 manufacturer part numbers on file: ST3M652C6-22A (Sps Technologies, Llc Dba PB Fasteners), ST3M652C6-22A (Reid Products Inc. Dba Reid Products Inc), ST3M652C6-22A (Heartland Precision Fasteners Inc), ST3M652C6-22A (Sps Technologies Ltd, Tj Brooks Division), ST3M652C6-22A (Huck International, Inc) and 10 more.
Key specifications for ST3M652C6-22A: Head Height: 0.115 INCHES MINIMUM AND 0.117 INCHES MAXIMUM IN; Fastener Length: 2.016 INCHES NOMINAL IN; Thread Length: 0.641 INCHES NOMINAL IN; Nominal Thread Diameter: 0.375 INCHES IN. 16 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.