The Screw,close Tolerance, cataloged under National Stock Number 5305-01-015-6646, 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 16 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 9 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-015-6646 |
| Primary Part Number | HT4025L3-3 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Fastener Length | 0.579 INCHES MINIMUM AND 0.609 INCHES MAXIMUM IN |
| Thread Length | 0.381 INCHES MINIMUM AND 0.431 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.178 INCHES MINIMUM AND 0.198 INCHES MAXIMUM IN |
| Grip Diameter | 0.1890 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 125000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.376 INCHES MINIMUM AND 0.385 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 |
|---|---|
| HT4025L3-3 PRIMARY | Hi-Shear Corporation (USA) |
| WC4025L-3-3 | West Coast Aerospace, Inc. (USA) |
| HT4025L3-3 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| HT4025L3-3 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| HT4025L3-3 | Howmet Global Fastening Systems Inc (USA) |
| HT4025L3-3 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M454-3L-3 PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT4025L3-3 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| 11905-3L3 PRIMARY | Reid Products Inc. Dba Reid Products Inc (USA) |
| HT4025L3-3 | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| ST3M454-3L-3 PRIMARY | The Boeing Company Div Defense (USA) |
| HT4025L3-3 PRIMARY | Huck International, Inc (USA) |
| ST3M454-3L-3 PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M454-3L-3 PRIMARY | Heartland Precision Fasteners Inc (USA) |
| ST3M454-3L-3 | Houston Precision Fasteners I Lp (USA) |
| ST3M454-3L3 | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc (USA) |
| Reference | Meaning |
|---|---|
| CHT4025-3-3 | 5/9 Secondary reference U.S. Government activity |
| HT4025L3-3 | 5/9 Secondary reference Sps Technologies Inc |
| HT4025L3-3 | 5/9 Secondary reference U.S. Government activity |
| 10114846 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| HT4025L3-3 | 5/9 Secondary reference U.S. Government activity |
| HT4025L3-3 | 3/2 Design control — primary reference U.S. Government activity |
| CHT4025-3-3 | C/1 Advisory reference — outside the item-of-supply concept Howmet Global Fastening Systems Inc |
| CHT4025-3-3 | 5/9 Secondary reference U.S. Government activity |
| CHT4025-3-3 | 5/9 Secondary reference Deutsch Co the |
NSN 5305-01-015-6646 is a Screw,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-015-6646 has 16 manufacturer part numbers on file: HT4025L3-3 (Hi-Shear Corporation), WC4025L-3-3 (West Coast Aerospace, Inc.), HT4025L3-3 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), HT4025L3-3 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), HT4025L3-3 (Howmet Global Fastening Systems Inc) and 11 more.
Key specifications for HT4025L3-3: Fastener Length: 0.579 INCHES MINIMUM AND 0.609 INCHES MAXIMUM IN; Thread Length: 0.381 INCHES MINIMUM AND 0.431 INCHES MAXIMUM IN; Material Document and Classification: AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Nominal Thread Diameter: 0.190 INCHES 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.