The Screw,close Tolerance, cataloged under National Stock Number 5305-01-568-0715, 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 15 specifications, cited from the U.S. Government catalog. The record lists 19 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through both NSN and commercial part number lookups. 9 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-568-0715 |
| Primary Part Number | ST3M454-6L20 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Fastener Length | 1.891 INCHES NOMINAL IN |
| Thread Length | 0.641 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.090 INCHES NOMINAL IN |
| Grip Diameter | 0.374 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.752 INCHES MINIMUM AND 0.762 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 |
|---|---|
| ST3M454-6L20 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M454-76120 | West Coast Aerospace, Inc. (USA) |
| ST3M454-76120 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| HT 4025L6-20 | Huck International, Inc (USA) |
| HT 4025L6-20 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M454-6L20 | Houston Precision Fasteners I Lp (USA) |
| ST3M454-76L20 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| 11905-6L-20 | Reid Products Inc. Dba Reid Products Inc (USA) |
| ST3M454-6L20 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT 4025L6-20 | Advanced Engineering Inc (USA) |
| ST3M454-76120 | Howmet Global Fastening Systems Inc (USA) |
| WC4025L-6-20 | West Coast Aerospace, Inc. (USA) |
| HT 4025L6-20 | Hi-Shear Corporation (USA) |
| ST3M454-6L20 | Reid Products Inc. Dba Reid Products Inc (USA) |
| HT 4025L6-20 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M454-6L20 | Heartland Precision Fasteners Inc (USA) |
| HT 4025L6-20 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M454-6L20 PRIMARY | The Boeing Company Div Defense (USA) |
| HT 4025L6-20 | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| Reference | Meaning |
|---|---|
| ST3M454-76120 | 5/2 Secondary reference U.S. Government activity |
| HT 4025L6-20 | 5/2 Secondary reference U.S. Government activity |
| ST3M454-76120 | 5/9 Secondary reference Microsemi Corp. - High Performance Timing Dba Vectron International- Cancelled |
| HT 4025L6-20 | 5/2 Secondary reference U.S. Government activity |
| HT 4025L6-20 | 5/9 Secondary reference Valley-Todeco, Inc. Dba Arconic Fastening Systems |
| ST3M454-76120 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| HT 4025L6-20 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| HT 4025L6-20 | 5/9 Secondary reference U.S. Government activity |
| ST3M454-76120 | 5/9 Secondary reference Huck International, Inc |
NSN 5305-01-568-0715 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-568-0715 has 19 manufacturer part numbers on file: ST3M454-6L20 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), ST3M454-76120 (West Coast Aerospace, Inc.), ST3M454-76120 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), HT 4025L6-20 (Huck International, Inc), HT 4025L6-20 (Sps Technologies, Llc Dba PB Fasteners) and 14 more.
Key specifications for ST3M454-6L20: Fastener Length: 1.891 INCHES NOMINAL IN; Thread Length: 0.641 INCHES NOMINAL IN; Nominal Thread Diameter: 0.375 INCHES IN; Head Style: FLAT COUNTERSUNK. 15 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.