The Nut,self-Locking,plate, cataloged under National Stock Number 5310-00-078-8610, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Republic Fastener Mfg. Corp. Dba Arconic Fastening Systems. Government technical data includes 24 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-078-8610 |
| Primary Part Number | LL66C428C |
| Item Name | Nut,self-Locking,plate |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Republic Fastener Mfg. Corp. Dba Arconic Fastening Systems |
| Status | ACTIVE |
| Plate Thickness | 0.031 INCHES NOMINAL IN |
| Nut Length | 1.300 INCHES NOMINAL IN |
| Thread Series | UNF |
| Precious Material | SILVER |
| Plate Width | 0.516 INCHES NOMINAL IN |
| Temp Rating | 1200.0 FAHRENHEIT NOMINAL DEGF |
| Mounting Hole Arrangement Style | 2 HOLES |
| Material Document and Classification | AMS 5510 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5642 ASSN STD 2ND MATERIAL RESPONSE OVERALL |
| Mounting Hole Diameter | 0.098 INCHES MINIMUM AND 0.103 INCHES MAXIMUM IN |
| Features Provided | FLOATING NUT |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.250 INCHES 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 | 0.351 INCHES NOMINAL IN |
| Surface Treatment | PASSIVATE BASE |
| Surface Treatment | SILVER NUT |
| Precious Material and Location | NUT,SURFACE TREATMENT SILVER |
| Nut Style | PLATE |
| Thread Class | 3B |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP 321 OR STEEL COMP 303F 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 |
|---|---|
| LL66C428C PRIMARY | Republic Fastener Mfg. Corp. Dba Arconic Fastening Systems (USA) |
| 3M148-4 | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| LHA8580-048 | 5/9 Secondary reference Harvard Industries Inc |
| LL66C428C | 5/9 Secondary reference Sps Technologies, Llc Dba Cherry Aerospace Div Div Cherry Aerospace |
NSN 5310-00-078-8610 is a Nut,self-Locking,plate, manufactured by Republic Fastener Mfg. Corp. Dba Arconic Fastening Systems, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-078-8610 has 2 manufacturer part numbers on file: LL66C428C (Republic Fastener Mfg. Corp. Dba Arconic Fastening Systems), 3M148-4 (The Boeing Company Div Defense).
Key specifications for LL66C428C: Plate Thickness: 0.031 INCHES NOMINAL IN; Nut Length: 1.300 INCHES NOMINAL IN; Thread Series: UNF; Precious Material: SILVER. 24 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.