The Screw,close Tolerance, cataloged under National Stock Number 5305-01-131-2209, 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 17 specifications, cited from the U.S. Government catalog. The record lists 17 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-131-2209 |
| Primary Part Number | ST3M454-6L16 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Fastener Length | 1.626 INCHES MINIMUM AND 1.656 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.616 INCHES MINIMUM AND 0.666 INCHES MAXIMUM IN |
| Material Document and Classification | AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.990 INCHES MINIMUM AND 1.010 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 |
|---|---|
| HT4025L6-16 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| HT4025L6-16 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| HT4025L6-16 | Howmet Global Fastening Systems Inc (USA) |
| HT4025L6-16 | Huck International, Inc (USA) |
| HT4025L6-16 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| HT4025L6-16 | Fairchild Fasteners Europe - Vsd Gmbh (DEU) |
| HT4025L6-16 | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| 11905-6L16 | Reid Products Inc. Dba Reid Products Inc (USA) |
| HT8140-6-16 | Fairchild Fasteners Europe - Vsd Gmbh (DEU) |
| HT4025L6-16 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT4025L6-16 | Hi-Shear Corporation (USA) |
| ST3M454-6L16 | Heartland Precision Fasteners Inc (USA) |
| ST3M454-6L16 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| WC4025L-6-16 | West Coast Aerospace, Inc. (USA) |
| ST3M454-6L16 PRIMARY | The Boeing Company Div Defense (USA) |
| ST3M454-6L16 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M454-6L16 | Houston Precision Fasteners I Lp (USA) |
| Reference | Meaning |
|---|---|
| HT4025L6-16 | 5/2 Secondary reference U.S. Government activity |
| ST3M454-6L16 | 5/9 Secondary reference Sps Technologies Ltd, Tj Brooks Division |
| BM19037-6-16 | 5/9 Secondary reference Huck International, Inc |
| 10115271 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
NSN 5305-01-131-2209 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-131-2209 has 17 manufacturer part numbers on file: HT4025L6-16 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), HT4025L6-16 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), HT4025L6-16 (Howmet Global Fastening Systems Inc), HT4025L6-16 (Huck International, Inc), HT4025L6-16 (Sps Technologies, Llc Dba PB Fasteners) and 12 more.
Key specifications for ST3M454-6L16: Fastener Length: 1.626 INCHES MINIMUM AND 1.656 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.616 INCHES MINIMUM AND 0.666 INCHES MAXIMUM IN; Material Document and Classification: AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 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.