The Screw,close Tolerance, cataloged under National Stock Number 5305-01-508-2139, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. Government technical data includes 17 specifications, cited from the U.S. Government catalog. The record lists 8 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-508-2139 |
| Primary Part Number | HT4025L7-15 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Fastener Length | 1.598 INCHES MINIMUM AND 1.628 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.675 INCHES NOMINAL IN |
| Material Document and Classification | MS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.438 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.928 INCHES MINIMUM AND 0.948 INCHES MAXIMUM IN |
| Grip Diameter | 0.437 INCHES NOMINAL 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 CORROSION RESISTING OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.880 INCHES MINIMUM AND 0.890 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 |
|---|---|
| WC4025L-7-15 | West Coast Aerospace, Inc. (USA) |
| 11905-7L15 | Reid Products Inc. Dba Reid Products Inc (USA) |
| HT4025L7-15 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| HT4025L7-15 | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| HT4025L7-15 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT4025L7-15 PRIMARY | Hi-Shear Corporation (USA) |
| ST3M454-7L15 | The Boeing Company Div Defense (USA) |
| ST3M454-7L15 PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| Reference | Meaning |
|---|---|
| HT4025L7-15 | 3/2 Design control — primary reference U.S. Government activity |
| HT4025L7-15 | 3/2 Design control — primary reference U.S. Government activity |
| HT4025L7-15 | 5/9 Secondary reference Sps Technologies Inc |
NSN 5305-01-508-2139 is a Screw,close Tolerance, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-508-2139 has 8 manufacturer part numbers on file: WC4025L-7-15 (West Coast Aerospace, Inc.), 11905-7L15 (Reid Products Inc. Dba Reid Products Inc), HT4025L7-15 (Howmet Global Fastening Systems Inc), HT4025L7-15 (Sps Technologies Ltd, Tj Brooks Division), HT4025L7-15 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc) and 3 more.
Key specifications for HT4025L7-15: Fastener Length: 1.598 INCHES MINIMUM AND 1.628 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.675 INCHES NOMINAL IN; Material Document and Classification: MS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 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.