The Screw,close Tolerance, cataloged under National Stock Number 5305-01-703-4071, 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 23 specifications, cited from the U.S. Government catalog. The record lists 13 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-703-4071 |
| Primary Part Number | ST3M454-5L18 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.133 INCHES NOMINAL IN |
| Point Length | 0.052 INCHES NOMINAL IN |
| Fastener Length | 1.641 INCHES MINIMUM AND 1.671 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | AMS 2700, METHOD 1 INTERNATIONAL STD/SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.531 INCHES NOMINAL IN |
| Material Document and Classification | AMS 5629 AEROSPACE MATERIAL SPEC STD SINGLE MATERIAL RESPONSE OVERALL |
| Point Chamfer Angle | 90.0 DEGREES NOMINAL |
| Single Shear Strength | ERR-060 |
| Nominal Thread Diameter | 0.3125 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Point Style | FLAT |
| Specification/standard Data | ST3-454 MANUFACTURERS STANDARD |
| Grip Length | 1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM IN |
| Grip Diameter | 0.3115 INCHES MINIMUM AND 0.3120 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 | 0.625 INCHES MINIMUM AND 0.635 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 |
|---|---|
| ST3M454-5L18 | Houston Precision Fasteners I Lp (USA) |
| HT4025L5-18 | Howmet Global Fastening Systems Inc (USA) |
| ST3M454-5L18 | Heartland Precision Fasteners Inc (USA) |
| HT4025L5-18 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 11905-5L18 | Reid Products Inc. Dba Reid Products Inc (USA) |
| ST3M454-5L18 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT4025L5-18 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M454-5L18 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| HT4025L5-18 | Huck International, Inc (USA) |
| HT4025L5-18 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| HT4025L5-18 | Hi-Shear Corporation (USA) |
| ST3M454-5L18 PRIMARY | The Boeing Company Div Defense (USA) |
| WC4025L-5-18 | West Coast Aerospace, Inc. (USA) |
| Reference | Meaning |
|---|---|
| HT4025L5-18 | 5/9 Secondary reference Sps Technologies Ltd, Tj Brooks Division |
| HT4025L5-18 | 5/2 Secondary reference U.S. Government activity |
| ST3M454 | D/9 Drawing number reference only The Boeing Company Div Defense |
| HT4025L5-18 | 5/2 Secondary reference U.S. Government activity |
| HT4025L5-18 | 5/9 Secondary reference Sps Technologies Inc |
NSN 5305-01-703-4071 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-703-4071 has 13 manufacturer part numbers on file: ST3M454-5L18 (Houston Precision Fasteners I Lp), HT4025L5-18 (Howmet Global Fastening Systems Inc), ST3M454-5L18 (Heartland Precision Fasteners Inc), HT4025L5-18 (Sps Technologies, Llc Dba PB Fasteners), 11905-5L18 (Reid Products Inc. Dba Reid Products Inc) and 8 more.
2 possible matches (shared part number, not a government interchangeability claim): 5305-01-716-3390, 5305-01-716-4381. Verify interchangeability with system specifications before substitution.
Key specifications for ST3M454-5L18: Head Height: 0.133 INCHES NOMINAL IN; Point Length: 0.052 INCHES NOMINAL IN; Fastener Length: 1.641 INCHES MINIMUM AND 1.671 INCHES MAXIMUM IN; Surface Treatment Document and Classification: AMS 2700, METHOD 1 INTERNATIONAL STD/SPEC SINGLE TREATMENT RESPONSE OVERALL. 23 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.