The Nut,self-Locking,plate, cataloged under National Stock Number 5310-01-137-4565, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 26 specifications, cited from the U.S. Government catalog. The record lists 3 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5310-01-137-4565 |
| Primary Part Number | ST3M443-5A6 |
| Item Name | Nut,self-Locking,plate |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Lubrication | DRY FILM LUBRICANT |
| Plate Thickness | 0.036 INCHES MINIMUM AND 0.044 INCHES MAXIMUM IN |
| Nut Length | 1.292 INCHES MAXIMUM IN |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Plate Width | 0.650 INCHES MAXIMUM IN |
| Mounting Hole Arrangement Style | 2 HOLES |
| Removable Nut Manufacturer Part Number | ST3M445C5M6 |
| Material Document and Classification | AMS 5525 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5732 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Mounting Hole Diameter | 0.130 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN |
| Nut Counterbore Depth | 0.375 INCHES MINIMUM NUT IN |
| Features Provided | FLOATING NUT |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.312 INCHES IN |
| Counterbore Diameter | 0.317 INCHES MINIMUM NUT IN |
| Distance From Aperture Center to Mounting Hole Center | 0.495 INCHES MINIMUM AND 0.505 INCHES MAXIMUM IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Center to Center Distance Between Mounting Holes Along Length | 0.998 INCHES MINIMUM AND 1.002 INCHES MAXIMUM IN |
| Nut Height | 0.649 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE BASE |
| Surface Treatment | NICKEL OR NICKEL AND COPPER OVERALL |
| Nut Style | PLATE |
| Thread Class | 3B |
| Thread Quantity Per Inch | 24 |
| Material | IRON ALLOY 660 OVERALL |
| Nut Mounting Provision | STRAIGHT HOLES |
| Removable Nut Manufacturer Code | 76301 |
| 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 |
|---|---|
| ST3M443-5A6 PRIMARY | The Boeing Company Div Defense (USA) |
| F49249E5-6 | Howmet Global Fastening Systems Inc (USA) |
| BFN443-5-6 | Bristol Industries, Llc (USA) |
| Reference | Meaning |
|---|---|
| 10109746 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| F18421L6-5 | 5/9 Secondary reference Harvard Industries Inc |
| F18421L6-5 | 5/2 Secondary reference U.S. Government activity |
| NS202041-054-6 | 5/2 Secondary reference U.S. Government activity |
NSN 5310-01-137-4565 is a Nut,self-Locking,plate, manufactured by The Boeing Company Div Defense, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-137-4565 has 3 manufacturer part numbers on file: ST3M443-5A6 (The Boeing Company Div Defense), F49249E5-6 (Howmet Global Fastening Systems Inc), BFN443-5-6 (Bristol Industries, Llc).
Key specifications for ST3M443-5A6: Lubrication: DRY FILM LUBRICANT; Plate Thickness: 0.036 INCHES MINIMUM AND 0.044 INCHES MAXIMUM IN; Nut Length: 1.292 INCHES MAXIMUM IN; Thread Series: UNIFIED NATIONAL JOINT FINE (UNJF). 26 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.