The Nut,self-Locking,plate, cataloged under National Stock Number 5310-00-778-9278, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Esna, Llc. Government technical data includes 24 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 13 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-778-9278 |
| Primary Part Number | RM52LHTA55-02BC |
| Item Name | Nut,self-Locking,plate |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Esna, Llc |
| Status | ACTIVE |
| Lubrication | DRY FILM LUBRICANT |
| Plate Thickness | 0.047 INCHES MAXIMUM IN |
| Nut Length | 0.653 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Series | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Temp Rating | 450.0 FAHRENHEIT MAXIMUM DEGF |
| Mounting Hole Arrangement Style | 2 HOLES |
| Hardness Rating | 49.0 ROCKWELL C MAXIMUM |
| Mounting Hole Countersink Angle | 98.0 DEGREES MINIMUM AND 102.0 DEGREES MAXIMUM |
| Mounting Hole Diameter | 0.098 INCHES MINIMUM AND 0.103 INCHES MAXIMUM IN |
| Mounting Provision Location | OPPOSITE NUT PROJECTION SIDE |
| Nut Counterbore Depth | 0.062 INCHES MINIMUM NUT IN |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.190 INCHES IN |
| Counterbore Diameter | 0.194 INCHES MINIMUM NUT IN |
| Distance From Aperture Center to Mounting Hole Center | 0.339 INCHES MINIMUM AND 0.349 INCHES MAXIMUM IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Nut Height | 0.250 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OVERALL |
| Nut Style | PLATE |
| Thread Class | 3B |
| Thread Quantity Per Inch | 32 |
| Material | STEEL OVERALL |
| Nut Mounting Provision | COUNTERSUNK 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 |
|---|---|
| RM52LHTA55-02BC | Esna, Llc (USA) |
| Reference | Meaning |
|---|---|
| T7S1032BC | 5/1 Secondary reference Republic Fastener Mfg. Corp. Use CAGE Code 52828 for Cataloging. |
| K3000-3BC | 5/9 Secondary reference Howmet Global Fastening Systems Inc. Div Microdot Products |
| MS21055L3K | 3/2 Design control — primary reference U.S. Government activity |
| R3000A3K | 5/1 Secondary reference Republic Fastener Mfg. Corp. Dba Arconic Fastening Systems |
| 5310PL0150411 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| T7S1032BC | 5/9 Secondary reference Sps Technologies, Llc Dba Cherry Aerospace Div Div Cherry Aerospace |
| NAS684A35 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| MS21055L3K | 5/9 Secondary reference U.S. Government activity |
| K3000-3BC | 5/1 Secondary reference Howmet Global Fastening Systems Inc |
| 12620-02BC | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| 12LHA5-02BC | C/1 Advisory reference — outside the item-of-supply concept Harvard Industries Inc |
| RM52LHTA55-02BC | 5/9 Secondary reference Harvard Industries Inc |
| 12620-02BC | 5/1 Secondary reference U.S. Government activity |
NSN 5310-00-778-9278 is a Nut,self-Locking,plate, manufactured by Esna, Llc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-778-9278 has 1 manufacturer part number on file: RM52LHTA55-02BC (Esna, Llc).
Key specifications for RM52LHTA55-02BC: Lubrication: DRY FILM LUBRICANT; Plate Thickness: 0.047 INCHES MAXIMUM IN; Nut Length: 0.653 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-416 FED SPEC SINGLE TREATMENT RESPONSE OVERALL. 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.