The Screw,close Tolerance, cataloged under National Stock Number 5305-00-324-9282, 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 16 specifications, cited from the U.S. Government catalog. The record lists 9 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-00-324-9282 |
| Primary Part Number | ST3M454-3L21 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Fastener Length | 1.703 INCHES MINIMUM AND 1.733 INCHES MAXIMUM IN |
| Thread Length | 0.381 INCHES MINIMUM AND 0.431 INCHES MAXIMUM IN |
| Material Document and Classification | 23-112 FSCM 76301 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.302 INCHES MINIMUM AND 1.322 INCHES MAXIMUM IN |
| Grip Diameter | 0.1890 INCHES MINIMUM AND 0.1895 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 | 32 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| 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 |
|---|---|
| HT4025L3-21 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M454-3L21 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M454-3L21 PRIMARY | The Boeing Company Div Defense (USA) |
| HT4025L3-21 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT4025L3-21 | Howmet Global Fastening Systems Inc (USA) |
| 11905-3L21 | Reid Products Inc. Dba Reid Products Inc (USA) |
| HT4025L3-21 | Hi-Shear Corporation (USA) |
| HT4025L3-21 | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| WC4025L-3-21 | West Coast Aerospace, Inc. (USA) |
| Reference | Meaning |
|---|---|
| ST3M454-3L21 | 5/9 Secondary reference U.S. Government activity |
| ST3M454-3L21 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| HT4025L3-21 | 5/9 Secondary reference U.S. Government activity |
| HT4025L3-21 | 5/2 Secondary reference U.S. Government activity |
| HT4025L3-21 | 5/9 Secondary reference Huck International, Inc |
| HT4025L3-21 | 5/9 Secondary reference Sps Technologies Inc |
| HT4025L3-21 | 5/9 Secondary reference U.S. Government activity |
| ST3M454-3L21 | 5/9 Secondary reference West Coast Aerospace, Inc. |
NSN 5305-00-324-9282 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-324-9282 has 9 manufacturer part numbers on file: HT4025L3-21 (Sps Technologies, Llc Dba PB Fasteners), ST3M454-3L21 (Fastener Innovation Technology, Inc. Dba F I T), ST3M454-3L21 (The Boeing Company Div Defense), HT4025L3-21 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), HT4025L3-21 (Howmet Global Fastening Systems Inc) and 4 more.
Key specifications for ST3M454-3L21: Fastener Length: 1.703 INCHES MINIMUM AND 1.733 INCHES MAXIMUM IN; Thread Length: 0.381 INCHES MINIMUM AND 0.431 INCHES MAXIMUM IN; Material Document and Classification: 23-112 FSCM 76301 MFR REF SINGLE MATERIAL RESPONSE OVERALL; Nominal Thread Diameter: 0.190 INCHES IN. 16 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.