The Screw,close Tolerance, cataloged under National Stock Number 5305-01-128-5128, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Hi-Shear Corporation. Government technical data includes 20 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-128-5128 |
| Primary Part Number | HT4020-7-23A |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Hi-Shear Corporation |
| 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 | 2.078 INCHES MINIMUM AND 2.125 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 | 1.428 INCHES MINIMUM AND 1.448 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 |
|---|---|
| ST3M652C7-23A | Huck International, Inc (USA) |
| HT4020-7-23A PRIMARY | Hi-Shear Corporation (USA) |
| ST3M652C7-23A | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| HT4020-7-23A PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT4020-7-23A PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| HT4020-7-23A | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| HT4020-7-23A | 5/9 Secondary reference U.S. Government activity |
| ST3M652C7-23A | 5/2 Secondary reference U.S. Government activity |
| HT4020-7-23A | 5/9 Secondary reference U.S. Government activity |
| HT4020-7-23A | 3/2 Design control — primary reference U.S. Government activity |
| HT4020-7-23A | 5/9 Secondary reference Sps Technologies Inc |
| ST3M652C7-23A | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
NSN 5305-01-128-5128 is a Screw,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-128-5128 has 6 manufacturer part numbers on file: ST3M652C7-23A (Huck International, Inc), HT4020-7-23A (Hi-Shear Corporation), ST3M652C7-23A (Sps Technologies Ltd, Tj Brooks Division), HT4020-7-23A (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), HT4020-7-23A (Howmet Global Fastening Systems Inc) and 1 more.
Key specifications for HT4020-7-23A: 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.