The Nut,self-Locking,plate, cataloged under National Stock Number 5310-01-331-8631, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 24 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-331-8631 |
| Item Name | Nut,self-Locking,plate |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Lubrication | DRY FILM LUBRICANT |
| Plate Thickness | 0.020 INCHES MINIMUM AND 0.035 INCHES MAXIMUM IN |
| Nut Length | 0.684 INCHES MAXIMUM IN |
| Distance From Mounting Hole Center to Base | 0.320 INCHES MINIMUM AND 0.330 INCHES MAXIMUM IN |
| Thread Series | UNJC |
| Plate Width | 0.325 INCHES MAXIMUM IN |
| Temp Rating | 450.0 FAHRENHEIT MAXIMUM DEGF |
| Mounting Hole Arrangement Style | 2 HOLES |
| Hardness Rating | 49.0 ROCKWELL C MAXIMUM |
| Distance From Base to Center of Aperture | 0.165 INCHES MINIMUM AND 0.175 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 5525 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5732 ASSN STD SINGLE 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 | 0.138 INCHES IN |
| Locking Feature | PREVAILING TORQUE ALL METAL DESIGN |
| Center to Center Distance Between Mounting Holes Along Length | 0.217 INCHES MINIMUM AND 0.221 INCHES MAXIMUM IN |
| Nut Height | 0.170 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Nut Style | PLATE |
| Thread Class | 3B |
| Thread Quantity Per Inch | 32 |
| 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 |
| Reference | Meaning |
|---|---|
| M83528/010A004 | C/1 Advisory reference — outside the item-of-supply concept Zf Industrieantriebe Witten Gmbh |
| MS51552CL06 | 2/2 Government specification standardization U.S. Government activity |
NSN 5310-01-331-8631 is a Nut,self-Locking,plate, classified under FSC 5310, Nuts and Washers. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5999-01-332-8671. Verify interchangeability with system specifications before substitution.
Key specifications for 5310-01-331-8631: Lubrication: DRY FILM LUBRICANT; Plate Thickness: 0.020 INCHES MINIMUM AND 0.035 INCHES MAXIMUM IN; Nut Length: 0.684 INCHES MAXIMUM IN; Distance From Mounting Hole Center to Base: 0.320 INCHES MINIMUM AND 0.330 INCHES MAXIMUM IN. 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.