The Nut,plain,clinch, cataloged under National Stock Number 5310-00-571-9526, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Penn Engineering & Manufacturing Corp. Government technical data includes 13 specifications, cited from the U.S. Government catalog. The record lists 2 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5310-00-571-9526 |
| Primary Part Number | CSS-440-6 |
| Item Name | Nut,plain,clinch |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Penn Engineering & Manufacturing Corp |
| Status | ACTIVE |
| Width Across Flats | 0.245 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | MIL-F-14072,E300 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Series | UNIFIED NATIONAL COARSE (UNC) |
| Material Document and Classification | AISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.112 INCHES IN |
| Pilot Diameter | 0.212 INCHES MAXIMUM IN |
| Nut Height | 0.188 INCHES NOMINAL IN |
| Surface Treatment | PASSIVATE OVERALL |
| Nut Style | CLINCH |
| Thread Class | 2B |
| Thread Quantity Per Inch | 40 |
| Material | STEEL COMP 303 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 |
|---|---|
| 10506-440-6 | Aimtron Systems, Llc (USA) |
| CSS-440-6 PRIMARY | Penn Engineering & Manufacturing Corp (USA) |
| Reference | Meaning |
|---|---|
| 10506-440-6 | 5/9 Secondary reference Cardion Inc |
| CS0S440-6 | 5/9 Secondary reference Penn Engineering & Manufacturing Corp |
NSN 5310-00-571-9526 is a Nut,plain,clinch, manufactured by Penn Engineering & Manufacturing Corp, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-571-9526 has 2 manufacturer part numbers on file: 10506-440-6 (Aimtron Systems, Llc), CSS-440-6 (Penn Engineering & Manufacturing Corp).
Key specifications for CSS-440-6: Width Across Flats: 0.245 INCHES MINIMUM AND 0.255 INCHES MAXIMUM IN; Surface Treatment Document and Classification: MIL-F-14072,E300 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Series: UNIFIED NATIONAL COARSE (UNC); Material Document and Classification: AISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 13 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.