The Screw,close Tolerance, cataloged under National Stock Number 5305-01-191-3125, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is West Coast Aerospace, Inc.. Government technical data includes 19 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-191-3125 |
| Primary Part Number | HT4024L4-26 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | West Coast Aerospace, Inc. |
| Status | ACTIVE |
| Head Height | 0.070 INCHES MINIMUM AND 0.074 INCHES MAXIMUM IN |
| Fastener Length | 2.079 INCHES MINIMUM AND 2.109 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.444 INCHES MINIMUM AND 0.494 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FILLISTER COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.615 INCHES MINIMUM AND 1.635 INCHES MAXIMUM IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 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 | 28 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.3898 INCHES MINIMUM AND 0.3948 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 |
|---|---|
| HT4024L4-26 PRIMARY | West Coast Aerospace, Inc. (USA) |
| HT4024L4-26 | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| HT4024L4-26 PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| 11907-4L26-1 | Reid Products Inc. Dba Reid Products Inc (USA) |
| HT4024L4-26 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT4024L4-26 PRIMARY | Hi-Shear Corporation (USA) |
| HT4024L4-26 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| HT4024L4-26 | 5/9 Secondary reference U.S. Government activity |
| HT4024L4-26 | 5/9 Secondary reference Sps Technologies Inc |
| HT4024L4-26 | 3/2 Design control — primary reference U.S. Government activity |
| HT4024L4-26 | 5/9 Secondary reference U.S. Government activity |
| ST3M455-4L26-1 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
NSN 5305-01-191-3125 is a Screw,close Tolerance, manufactured by West Coast Aerospace, Inc., classified under FSC 5305, Screws. Status: active.
NSN 5305-01-191-3125 has 7 manufacturer part numbers on file: HT4024L4-26 (West Coast Aerospace, Inc.), HT4024L4-26 (Sps Technologies Ltd, Tj Brooks Division), HT4024L4-26 (Fastener Innovation Technology, Inc. Dba F I T), 11907-4L26-1 (Reid Products Inc. Dba Reid Products Inc), HT4024L4-26 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc) and 2 more.
Key specifications for HT4024L4-26: Head Height: 0.070 INCHES MINIMUM AND 0.074 INCHES MAXIMUM IN; Fastener Length: 2.079 INCHES MINIMUM AND 2.109 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.444 INCHES MINIMUM AND 0.494 INCHES MAXIMUM IN. 19 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.