The Nut,self-Locking,plate, cataloged under National Stock Number 5310-01-431-7551, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. Government technical data includes 20 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-431-7551 |
| Primary Part Number | ST3M442-6A1 |
| Item Name | Nut,self-Locking,plate |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Plate Thickness | 0.046 INCHES MINIMUM AND 0.054 INCHES MAXIMUM IN |
| Nut Length | 1.441 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE SHELL |
| Plate Width | 0.740 INCHES MAXIMUM IN |
| Mounting Hole Arrangement Style | 2 HOLES |
| Removable Nut Manufacturer Part Number | ST3M445C6M2 |
| Material Document and Classification | AMS 5525 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5735 ASSN STD 2ND MATERIAL RESPONSE OVERALL |
| Mounting Hole Diameter | 0.130 INCHES MINIMUM AND 0.135 INCHES MAXIMUM IN |
| Nut Counterbore Depth | 0.070 INCHES MINIMUM NUT IN |
| Features Provided | FLOATING NUT |
| Counterbore Diameter | 0.379 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 | 0.310 INCHES MINIMUM AND 0.314 INCHES MAXIMUM IN |
| Nut Height | 0.374 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE SHELL |
| Nut Style | PLATE |
| Material | IRON ALLOY 660 SHELL |
| 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 |
|---|---|
| ST3M442-6A1 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| ST3M442-6A1 PRIMARY | Esna, Llc (USA) |
| ST3M442-6A1 PRIMARY | Bristol Industries, Llc (USA) |
| Reference | Meaning |
|---|---|
| F49251E6-1 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| ST3M442-6A1 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| ST3M442-6A1 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-01-431-7551 is a Nut,self-Locking,plate, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-431-7551 has 3 manufacturer part numbers on file: ST3M442-6A1 (Howmet Global Fastening Systems Inc), ST3M442-6A1 (Esna, Llc), ST3M442-6A1 (Bristol Industries, Llc).
Key specifications for ST3M442-6A1: Plate Thickness: 0.046 INCHES MINIMUM AND 0.054 INCHES MAXIMUM IN; Nut Length: 1.441 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE SHELL; Plate Width: 0.740 INCHES MAXIMUM 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.