The Screw,close Tolerance, cataloged under National Stock Number 5305-01-128-5129, 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 20 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-128-5129 |
| Primary Part Number | ST3M652C7-24A |
| 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 |
| Head Height | 0.130 INCHES MINIMUM AND 0.133 INCHES MAXIMUM IN |
| Fastener Length | 2.140 INCHES MINIMUM AND 2.187 INCHES MAXIMUM IN |
| Thread Length | 0.630 INCHES MINIMUM AND 0.697 INCHES MAXIMUM IN |
| Material Document and Classification | AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.438 INCHES IN |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.490 INCHES MINIMUM AND 1.510 INCHES MAXIMUM IN |
| Grip Diameter | 0.4365 INCHES MINIMUM AND 0.4370 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 | 20 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.881 INCHES MINIMUM AND 0.888 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 |
|---|---|
| ST3M652C7-24A | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT4020-7-24A | Howmet Global Fastening Systems Inc (USA) |
| HT4020-7-24A | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| WC4020-7-24A | West Coast Aerospace, Inc. (USA) |
| ST3M652C7-24A PRIMARY | The Boeing Company Div Defense (USA) |
| HT4020-7-24A | Huck International, Inc (USA) |
| HT4020-7-24A | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| HT4020-7-24A | 5/2 Secondary reference U.S. Government activity |
| HT4020-7-24A | 5/9 Secondary reference U.S. Government activity |
| 10115175 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| HT4020-7-24A | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-128-5129 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-128-5129 has 7 manufacturer part numbers on file: ST3M652C7-24A (Fastener Innovation Technology, Inc. Dba F I T), HT4020-7-24A (Howmet Global Fastening Systems Inc), HT4020-7-24A (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), WC4020-7-24A (West Coast Aerospace, Inc.), ST3M652C7-24A (The Boeing Company Div Defense) and 2 more.
Key specifications for ST3M652C7-24A: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Surface Finish: 32.0 MICROINCHES BEARING SURFACE OF HEAD; Head Height: 0.130 INCHES MINIMUM AND 0.133 INCHES MAXIMUM IN. 20 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.