The Screw,close Tolerance, cataloged under National Stock Number 5305-01-021-6845, 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 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-021-6845 |
| Primary Part Number | ST3M466V4L2-1 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Fastener Length | 0.579 INCHES MINIMUM AND 0.609 INCHES MAXIMUM IN |
| Thread Length | 0.444 INCHES MINIMUM AND 0.494 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | OVAL COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.115 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | TITANIUM ALLOY OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.389 INCHES MINIMUM AND 0.394 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 |
|---|---|
| HT4028L4-2 | Huck International, Inc (USA) |
| ST3M466V4L2-1 PRIMARY | The Boeing Company Div Defense (USA) |
| HT4028L4-2 | Howmet Global Fastening Systems Inc (USA) |
| HT4028L4-2 | Hi-Shear Corporation (USA) |
| ST3M466V4L2-1 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| HT4028L4-2 | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| ST3M466V4L2-1 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M466V4L2-1 | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc (USA) |
| HT4028L4-2 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 11909V4L2-1 | Reid Products Inc. Dba Reid Products Inc (USA) |
| HT4028L4-2 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M466V4L2-1 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| Reference | Meaning |
|---|---|
| HT4028L4-2 | 5/2 Secondary reference U.S. Government activity |
| HT4028L4-2 | 5/9 Secondary reference U.S. Government activity |
| HT4028L4-2 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-021-6845 is a Screw,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-021-6845 has 12 manufacturer part numbers on file: HT4028L4-2 (Huck International, Inc), ST3M466V4L2-1 (The Boeing Company Div Defense), HT4028L4-2 (Howmet Global Fastening Systems Inc), HT4028L4-2 (Hi-Shear Corporation), ST3M466V4L2-1 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company) and 7 more.
Key specifications for ST3M466V4L2-1: Fastener Length: 0.579 INCHES MINIMUM AND 0.609 INCHES MAXIMUM IN; Thread Length: 0.444 INCHES MINIMUM AND 0.494 INCHES MAXIMUM IN; Nominal Thread Diameter: 0.250 INCHES IN; Head Style: OVAL 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.