The Screw,close Tolerance, cataloged under National Stock Number 5305-01-716-4381, 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 20 specifications, cited from the U.S. Government catalog. The record lists 12 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-716-4381 |
| Primary Part Number | ST3M454-6L18 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.160 INCHES NOMINAL IN |
| Fastener Length | 1.751 INCHES MINIMUM AND 1.781 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | AMS2700,METHOD 1 OR 2 NATIONAL STD/SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.641 INCHES NOMINAL IN |
| Material Document and Classification | PH13-8MO PER AMS5629 AEROSPACE MATERIAL SPEC STD SINGLE MATERIAL RESPONSE OVERALL |
| Single Shear Strength | ERR-060 |
| Nominal Thread Diameter | 0.3750 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 76301-ST3-454 MANUFACTURERS STANDARD |
| Grip Length | 1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM IN |
| Grip Diameter | 0.3740 INCHES MINIMUM AND 0.3745 INCHES MAXIMUM 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 | 24 |
| Material | STEEL COMP XM-13 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 |
|---|---|
| ST3M454-6L18 | Houston Precision Fasteners I Lp (USA) |
| ST3M454-6L18 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M454-6L18 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| WC4025L-6-18 | West Coast Aerospace, Inc. (USA) |
| HT4025L6-18 | Huck International, Inc (USA) |
| HT4025L6-18 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M454-6L18 PRIMARY | The Boeing Company Div Defense (USA) |
| ST3M454-6L18 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| HT4025L6-18 | Hi-Shear Corporation (USA) |
| HT4025L6-18 | Howmet Global Fastening Systems Inc (USA) |
| ST3M454-6L18 | Heartland Precision Fasteners Inc (USA) |
| HT4025L6-18 | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| Reference | Meaning |
|---|---|
| HT4025L6-18 | 5/2 Secondary reference U.S. Government activity |
| HT4025L6-18 | 5/2 Secondary reference U.S. Government activity |
| ST3M454 | D/9 Drawing number reference only The Boeing Company Div Defense |
NSN 5305-01-716-4381 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-716-4381 has 12 manufacturer part numbers on file: ST3M454-6L18 (Houston Precision Fasteners I Lp), ST3M454-6L18 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), ST3M454-6L18 (Fastener Innovation Technology, Inc. Dba F I T), WC4025L-6-18 (West Coast Aerospace, Inc.), HT4025L6-18 (Huck International, Inc) and 7 more.
Key specifications for ST3M454-6L18: Head Height: 0.160 INCHES NOMINAL IN; Fastener Length: 1.751 INCHES MINIMUM AND 1.781 INCHES MAXIMUM IN; Surface Treatment Document and Classification: AMS2700,METHOD 1 OR 2 NATIONAL STD/SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.641 INCHES NOMINAL IN. 20 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.