The Nut,plain,round, cataloged under National Stock Number 5310-00-474-7878, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Illinois Tool Works Inc.. Government technical data includes 11 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-474-7878 |
| Primary Part Number | MB138 |
| Item Name | Nut,plain,round |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Illinois Tool Works Inc. |
| Status | ACTIVE |
| Thread Series | UNEF |
| Material Document and Classification | SAE 73 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.312 INCHES IN |
| Nut Diameter | 0.406 INCHES NOMINAL IN |
| Nut Thickness | 0.203 INCHES NOMINAL IN |
| Surface Treatment | NICKEL OVERALL |
| Nut Style | ROUND |
| Thread Class | 2B |
| Thread Quantity Per Inch | 32 |
| Material | COPPER ALLOY 464 OVERALL |
| 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 |
|---|---|
| MB138 PRIMARY | Illinois Tool Works Inc. (USA) |
NSN 5310-00-474-7878 is a Nut,plain,round, manufactured by Illinois Tool Works Inc., classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-474-7878 has 1 manufacturer part number on file: MB138 (Illinois Tool Works Inc.).
Key specifications for MB138: Thread Series: UNEF; Material Document and Classification: SAE 73 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Thread Direction: RIGHT-HAND; Nominal Thread Size: 0.312 INCHES IN. 11 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.