The Screw,close Tolerance, cataloged under National Stock Number 5305-01-027-5253, 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 17 specifications, cited from the U.S. Government catalog. The record lists 4 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through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-027-5253 |
| Primary Part Number | HT4028L5-4 |
| 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 |
| Fastener Length | 0.766 INCHES MINIMUM AND 0.796 INCHES MAXIMUM IN |
| Thread Length | 0.506 INCHES MINIMUM AND 0.556 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 4928 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 4967 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Head Style | OVAL COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN |
| Grip Diameter | 0.3115 INCHES MINIMUM AND 0.3120 INCHES MAXIMUM IN |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | TITANIUM ALLOY OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.468 INCHES MINIMUM AND 0.473 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 |
|---|---|
| HT4028L5-4 PRIMARY | Hi-Shear Corporation (USA) |
| HT4028L5-4 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| 11909V5L4-1 | Reid Products Inc. Dba Reid Products Inc (USA) |
| ST3M466V5L4-1 | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| Reference | Meaning |
|---|---|
| ST3M466V5L4-1 | 5/2 Secondary reference U.S. Government activity |
| ST3M466V5L4-1 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| HT4028L5-4 | 5/9 Secondary reference U.S. Government activity |
| HT4028L5-4 | 3/2 Design control — primary reference U.S. Government activity |
| HT4028L5-4 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| HT4028L5-4 | 5/9 Secondary reference U.S. Government activity |
| HT4028L5-4 | C/1 Advisory reference — outside the item-of-supply concept Howmet Global Fastening Systems Inc |
| HT4028L5-4 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
NSN 5305-01-027-5253 is a Screw,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-027-5253 has 4 manufacturer part numbers on file: HT4028L5-4 (Hi-Shear Corporation), HT4028L5-4 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), 11909V5L4-1 (Reid Products Inc. Dba Reid Products Inc), ST3M466V5L4-1 (Sps Technologies Ltd, Tj Brooks Division).
Key specifications for HT4028L5-4: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES GRIP; Fastener Length: 0.766 INCHES MINIMUM AND 0.796 INCHES MAXIMUM IN; Thread Length: 0.506 INCHES MINIMUM AND 0.556 INCHES MAXIMUM IN. 17 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.