The Nut,plain,round, cataloged under National Stock Number 5310-01-237-5557, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. Government technical data includes 19 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-237-5557 |
| Item Name | Nut,plain,round |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Status | ACTIVE |
| Hole Thread Quantity Per Inch | 20 |
| Surface Treatment Document and Classification | MIL-C-26074,CLASS 1,GRADE A MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Series | UN |
| Criticality Code Justification | ZZZY |
| Hole Configuration Style | CONFIGURATION J |
| Thread Pitch Diameters | +1.1835 TO 1.1970 INCHES IN |
| Material Document and Classification | MIL-S-5000,COND C MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 1.188 INCHES IN |
| Nut Diameter | 2.750 INCHES NOMINAL IN |
| Nut Thickness | 1.250 INCHES NOMINAL IN |
| Surface Treatment | NICKEL OVERALL |
| Nut Style | ROUND |
| Thread Class | 2B |
| Hole Nominal Thread Diameter | 0.250 INCHES IN |
| Thread Quantity Per Inch | 8 |
| Material | STEEL COMP 4340 OVERALL |
| Reference Number Differentiating Characteristics | MATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS |
| Hole Type and Quantity | 4 TAPPED |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | C |
| Reference | Meaning |
|---|---|
| 926B809 | 3/9 Design control — primary reference Cbs Broadcasting Inc. Dba Cbs Div Bechtel Plant Machinery Inc. - Pittsburgh |
NSN 5310-01-237-5557 is a Nut,plain,round, classified under FSC 5310, Nuts and Washers. Status: active.
Key specifications for 5310-01-237-5557: Hole Thread Quantity Per Inch: 20; Surface Treatment Document and Classification: MIL-C-26074,CLASS 1,GRADE A MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Series: UN; Criticality Code Justification: ZZZY. 19 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.