The Nut,self-Locking,plate, cataloged under National Stock Number 5310-00-997-2878, 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 18 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-997-2878 |
| Primary Part Number | 490143 |
| Item Name | Nut,self-Locking,plate |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Plate Thickness | 0.055 INCHES MINIMUM AND 0.075 INCHES MAXIMUM IN |
| Nut Length | 1.008 INCHES MINIMUM AND 1.038 INCHES MAXIMUM IN |
| Thread Series | UNF |
| Plate Width | 0.444 INCHES MINIMUM AND 0.464 INCHES MAXIMUM IN |
| Mounting Hole Arrangement Style | 2 HOLES |
| Mounting Hole Diameter | 0.098 INCHES MINIMUM AND 0.103 INCHES MAXIMUM IN |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.250 INCHES IN |
| Distance From Aperture Center to Mounting Hole Center | 0.329 INCHES MINIMUM AND 0.359 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 | 0.313 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OVERALL |
| Countersink Angle | 90.0 DEGREES NOMINAL NUT |
| Nut Style | PLATE |
| Thread Class | 3B |
| Thread Quantity Per Inch | 28 |
| 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 |
|---|---|
| 490143 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| 490143 | Tokyo Judoi Kogyo K.k. (JPN) |
| 490143 | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| Reference | Meaning |
|---|---|
| 490143 | 5/9 Secondary reference Harvard Industries Inc |
| NS203299 | 5/9 Secondary reference U.S. Government activity |
| 490143 | 5/9 Secondary reference Tokyo Judogi Kogyo Co. |
| 490143 | 3/2 Design control — primary reference U.S. Government activity |
| D52ZA6636-048 | 5/9 Secondary reference Harvard Industries Inc |
| 490143 | 5/9 Secondary reference Turbo Power & Marine System Inc Sub of United Technologies Corp |
NSN 5310-00-997-2878 is a Nut,self-Locking,plate, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-997-2878 has 3 manufacturer part numbers on file: 490143 (Howmet Global Fastening Systems Inc), 490143 (Tokyo Judoi Kogyo K.k.), 490143 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney).
Key specifications for 490143: Plate Thickness: 0.055 INCHES MINIMUM AND 0.075 INCHES MAXIMUM IN; Nut Length: 1.008 INCHES MINIMUM AND 1.038 INCHES MAXIMUM IN; Thread Series: UNF; Plate Width: 0.444 INCHES MINIMUM AND 0.464 INCHES MAXIMUM IN. 18 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.