The Nut,plain,hexagon, cataloged under National Stock Number 5310-01-657-2112, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Karen Carlisle Dba B & K Aerospace. Government technical data includes 12 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-657-2112 |
| Primary Part Number | B18.24-2004 |
| Item Name | Nut,plain,hexagon |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Karen Carlisle Dba B & K Aerospace |
| Status | ACTIVE |
| Width Across Flats | 0.489 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN |
| Thread Series | UNIFIED NATIONAL COARSE (UNC) |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.312 INCHES IN |
| Nut Height | 0.258 INCHES MINIMUM AND 0.273 INCHES MAXIMUM IN |
| Surface Treatment | ZINC AND CHROMATE OVERALL |
| Inside Width Across Flats | 0.489 INCHES MINIMUM IN |
| Nut Style | HEXAGON |
| Thread Class | 2B |
| Thread Quantity Per Inch | 18 |
| Material | STEEL OVERALL |
| Bearing Surface Type | FLAT OR CHAMFERED OR WASHER FACED |
| 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 |
|---|---|
| B18.24-2004 | Karen Carlisle Dba B & K Aerospace (USA) |
| B18.24-2004 | A & S Skill Machinists, Inc. Dba a & S Skill Machinist Inc (USA) |
| B18.24-2004 | Liberty Fastener Co (USA) |
| B18.24-2004 | Quality Socket Screw Manufacturing Corp (USA) |
| Reference | Meaning |
|---|---|
| AEN04C312000AZ7A81 | 5/1 Secondary reference The American Society of Mechanical Engineers |
| B18.24-2004 | 3/1 Design control — primary reference The American Society of Mechanical Engineers |
NSN 5310-01-657-2112 is a Nut,plain,hexagon, manufactured by Karen Carlisle Dba B & K Aerospace, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-657-2112 has 4 manufacturer part numbers on file: B18.24-2004 (Karen Carlisle Dba B & K Aerospace), B18.24-2004 (A & S Skill Machinists, Inc. Dba a & S Skill Machinist Inc), B18.24-2004 (Liberty Fastener Co), B18.24-2004 (Quality Socket Screw Manufacturing Corp).
Key specifications for B18.24-2004: Width Across Flats: 0.489 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN; Thread Series: UNIFIED NATIONAL COARSE (UNC); Thread Direction: RIGHT-HAND; Nominal Thread Size: 0.312 INCHES IN. 12 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.