The Nut,self-Locking,plate, cataloged under National Stock Number 5310-00-232-0728, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is L3harris Technologies, Inc. Dba Harris Corp Div Antenna Products. Government technical data includes 20 specifications, cited from the U.S. Government catalog. The record lists 5 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5310-00-232-0728 |
| Primary Part Number | 990291-31 |
| Item Name | Nut,self-Locking,plate |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | L3harris Technologies, Inc. Dba Harris Corp Div Antenna Products |
| Status | ACTIVE |
| Plate Thickness | 0.040 INCHES MAXIMUM IN |
| Nut Length | 0.331 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | AMS 2410 ASSN STD SINGLE TREATMENT RESPONSE OR AMS 2411 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Thread Series | UNJC |
| Precious Material | SILVER |
| Temp Rating | 900.0 FAHRENHEIT MAXIMUM DEGF |
| Mounting Hole Arrangement Style | 2 HOLES |
| Mounting Hole Diameter | 0.066 INCHES MINIMUM AND 0.071 INCHES MAXIMUM IN |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.112 INCHES IN |
| Distance From Aperture Center to Mounting Hole Center | 0.143 INCHES MINIMUM AND 0.153 INCHES MAXIMUM IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Nut Height | 0.143 INCHES MAXIMUM IN |
| Surface Treatment | SILVER OVERALL |
| Precious Material and Location | OVERALL SILVER |
| Nut Style | PLATE |
| Thread Class | 3B |
| Thread Quantity Per Inch | 40 |
| Material | IRON ALLOY 660 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 |
|---|---|
| MK3331-04 | Howmet Global Fastening Systems Inc (USA) |
| 990291-31,41,51 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| MA12720-40 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 990291-31,41,51 | Howmet Global Fastening Systems Inc (USA) |
| 990291-31 PRIMARY | L3harris Technologies, Inc. Dba Harris Corp Div Antenna Products (USA) |
| Reference | Meaning |
|---|---|
| LHTA55M2860-40 | 5/9 Secondary reference Harvard Industries Inc |
| LHTA55M2860-40 | C/1 Advisory reference — outside the item-of-supply concept Esna, Llc |
NSN 5310-00-232-0728 is a Nut,self-Locking,plate, manufactured by L3harris Technologies, Inc. Dba Harris Corp Div Antenna Products, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-232-0728 has 5 manufacturer part numbers on file: MK3331-04 (Howmet Global Fastening Systems Inc), 990291-31,41,51 (Sps Technologies, Llc Dba PB Fasteners), MA12720-40 (Sps Technologies, Llc Dba PB Fasteners), 990291-31,41,51 (Howmet Global Fastening Systems Inc), 990291-31 (L3harris Technologies, Inc. Dba Harris Corp Div Antenna Products).
Key specifications for 990291-31: Plate Thickness: 0.040 INCHES MAXIMUM IN; Nut Length: 0.331 INCHES MAXIMUM IN; Surface Treatment Document and Classification: AMS 2410 ASSN STD SINGLE TREATMENT RESPONSE OR AMS 2411 ASSN STD SINGLE TREATMENT RESPONSE OVERALL; Thread Series: UNJC. 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.