The Nut,self-Locking,plate, cataloged under National Stock Number 5310-01-334-1055, 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 20 specifications, cited from the U.S. Government catalog. The record lists 4 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5310-01-334-1055 |
| Primary Part Number | ST3M442-5A5 |
| Item Name | Nut,self-Locking,plate |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Plate Thickness | 0.040 INCHES NOMINAL IN |
| Nut Length | 1.396 INCHES MAXIMUM IN |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Plate Width | 0.710 INCHES NOMINAL IN |
| Mounting Hole Arrangement Style | 2 HOLES |
| Material Document and Classification | AMS286 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Mounting Hole Diameter | 0.135 INCHES MAXIMUM IN |
| Nut Counterbore Depth | 0.313 INCHES MINIMUM NUT IN |
| 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 | 0.500 INCHES MAXIMUM IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Center to Center Distance Between Mounting Holes Along Length | 0.314 INCHES MAXIMUM IN |
| Nut Height | 0.577 INCHES MAXIMUM IN |
| Nut Style | PLATE |
| Thread Class | 3B |
| Thread Quantity Per Inch | 24 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Nut Mounting Provision | STRAIGHT HOLES |
| 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 |
|---|---|
| BFN442-5-5 | Bristol Industries, Llc (USA) |
| F18427L5-5 | Esna, Llc (USA) |
| BFN1695-5 | Bristol Industries, Llc (USA) |
| ST3M442-5A5 PRIMARY | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| F49251E5-5 | C/1 Advisory reference — outside the item-of-supply concept Howmet Global Fastening Systems Inc |
| T49251E5-5 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| FY9251E5-5 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| F18427L5-5 | 5/9 Secondary reference Harvard Industries Inc |
NSN 5310-01-334-1055 is a Nut,self-Locking,plate, manufactured by The Boeing Company Div Defense, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-334-1055 has 4 manufacturer part numbers on file: BFN442-5-5 (Bristol Industries, Llc), F18427L5-5 (Esna, Llc), BFN1695-5 (Bristol Industries, Llc), ST3M442-5A5 (The Boeing Company Div Defense).
Key specifications for ST3M442-5A5: Plate Thickness: 0.040 INCHES NOMINAL IN; Nut Length: 1.396 INCHES MAXIMUM IN; Thread Series: UNIFIED NATIONAL JOINT FINE (UNJF); Plate Width: 0.710 INCHES NOMINAL IN. 20 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.