The Screw,close Tolerance, cataloged under National Stock Number 5305-01-255-9449, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 24 specifications, cited from the U.S. Government catalog. The record lists 15 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-255-9449 |
| Primary Part Number | ST3M454-3DL6 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Fastener Length | 0.766 INCHES MINIMUM AND 0.796 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE THREADS |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE GRIP |
| Surface Treatment Document and Classification | 595 FED STD SINGLE TREATMENT RESPONSE TOP OF HEAD |
| Thread Length | 0.381 INCHES MINIMUM AND 0.431 INCHES MAXIMUM IN |
| Shank Unthreaded Hole Diameter | 0.070 INCHES MINIMUM AND 0.075 INCHES MAXIMUM FIRST HOLE IN |
| Material Document and Classification | AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN |
| Grip Diameter | 0.1890 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE THREADS |
| Surface Treatment | PASSIVATE GRIP |
| Surface Treatment | PAINT TOP OF HEAD |
| 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 | 32 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 0.645 INCHES MINIMUM AND 0.685 INCHES MAXIMUM FIRST HOLE IN |
| 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 |
|---|---|
| HT4025L3D6 | Huck International, Inc (USA) |
| 11905-3DL6 | Reid Products Inc. Dba Reid Products Inc (USA) |
| HT4025L3D6 | Hi-Shear Corporation (USA) |
| ST3M454-3DL6 | Heartland Precision Fasteners Inc (USA) |
| HT4025L3D6 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| HT4025L3D6 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M454-3DL6 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| HT4025L3D6 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| HT4025L3D6 | Howmet Global Fastening Systems Inc (USA) |
| HT4025L3D6 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M454-3DL6 | Houston Precision Fasteners I Lp (USA) |
| ST3M454-3DL6 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT4025L3D6 | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| WC4025L-3D6 | West Coast Aerospace, Inc. (USA) |
| ST3M454-3DL6 PRIMARY | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| ST3M454-3DL6 | 5/9 Secondary reference U.S. Government activity |
| HT4025L3D6 | 5/2 Secondary reference U.S. Government activity |
| ST3M454-3DL6 | 5/9 Secondary reference Sps Technologies Ltd, Tj Brooks Division |
| HT4025L3D6 | 5/9 Secondary reference U.S. Government activity |
| HT4025L3D6 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-255-9449 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-255-9449 has 15 manufacturer part numbers on file: HT4025L3D6 (Huck International, Inc), 11905-3DL6 (Reid Products Inc. Dba Reid Products Inc), HT4025L3D6 (Hi-Shear Corporation), ST3M454-3DL6 (Heartland Precision Fasteners Inc), HT4025L3D6 (Sps Technologies, Llc Dba PB Fasteners) and 10 more.
Key specifications for ST3M454-3DL6: Fastener Length: 0.766 INCHES MINIMUM AND 0.796 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE THREADS; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE GRIP; Surface Treatment Document and Classification: 595 FED STD SINGLE TREATMENT RESPONSE TOP OF HEAD. 24 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.