The Nut,plain,octagon, cataloged under National Stock Number 5310-00-374-2133, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Mack Trucks Inc Parts Opn. Government technical data includes 15 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-374-2133 |
| Primary Part Number | B188420 |
| Item Name | Nut,plain,octagon |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Mack Trucks Inc Parts Opn |
| Status | ACTIVE |
| Width Across Flats | 3.812 INCHES NOMINAL IN |
| Thread Series | UN |
| Hole Configuration Style | CONFIGURATION H |
| Material Document and Classification | SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Features Provided | CASEHARDENED |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 2.625 INCHES IN |
| Nut Height | 0.359 INCHES NOMINAL IN |
| Drilled Hole Diameter | 0.257 INCHES NOMINAL IN |
| Nut Style | PLAIN, OCTAGON |
| Thread Class | 2B |
| Thread Quantity Per Inch | 16 |
| Material | STEEL COMP 1020 OVERALL |
| Bearing Surface Type | CHAMFERED |
| Hole Type and Quantity | 1 DRILLED |
| 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 |
|---|---|
| B188420 PRIMARY | Mack Trucks Inc Parts Opn (USA) |
| 5174195 PRIMARY | Mack Trucks Inc Parts Opn (USA) |
| 5174195 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| 16T1056 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5310-00-374-2133 is a Nut,plain,octagon, manufactured by Mack Trucks Inc Parts Opn, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-374-2133 has 3 manufacturer part numbers on file: B188420 (Mack Trucks Inc Parts Opn), 5174195 (Mack Trucks Inc Parts Opn), 5174195 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for B188420: Width Across Flats: 3.812 INCHES NOMINAL IN; Thread Series: UN; Hole Configuration Style: CONFIGURATION H; Material Document and Classification: SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 15 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.