The Nut,plain,hexagon, cataloged under National Stock Number 5310-00-550-2157, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Brooks Instrument Llc. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-00-550-2157 |
| Primary Part Number | 143-5 |
| Item Name | Nut,plain,hexagon |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Brooks Instrument Llc |
| Status | ACTIVE |
| Width Across Flats | 0.870 INCHES MINIMUM AND 0.880 INCHES MAXIMUM IN |
| Thread Series | UNIFIED NATIONAL COARSE (UNC) |
| Material Document and Classification | ASTM A307 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.500 INCHES IN |
| Nut Height | 0.479 INCHES MINIMUM AND 0.489 INCHES MAXIMUM IN |
| Nut Style | HEXAGON |
| Thread Class | 2B |
| Thread Quantity Per Inch | 13 |
| Material | STEEL OVERALL |
| Bearing Surface Type | 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 |
|---|---|
| 143-5 | Brooks Instrument Llc (USA) |
| Reference | Meaning |
|---|---|
| 3-5273 | 3/9 Design control — primary reference Chicago Pneumatic Tool Co |
| 143-5 | 5/9 Secondary reference U.S. Government activity |
NSN 5310-00-550-2157 is a Nut,plain,hexagon, manufactured by Brooks Instrument Llc, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-00-550-2157 has 1 manufacturer part number on file: 143-5 (Brooks Instrument Llc).
1 possible match (shared part number, not a government interchangeability claim): 2835-01-030-9349. Verify interchangeability with system specifications before substitution.
Key specifications for 143-5: Width Across Flats: 0.870 INCHES MINIMUM AND 0.880 INCHES MAXIMUM IN; Thread Series: UNIFIED NATIONAL COARSE (UNC); Material Document and Classification: ASTM A307 ASSN STD SINGLE MATERIAL RESPONSE OVERALL; Thread Direction: RIGHT-HAND. 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.