The Nut,plain,single Ball Seat,hexag, cataloged under National Stock Number 5310-01-620-0557, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Fastenal Company Dba Fastenal Co Div Ilmon. Government technical data includes 12 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5310-01-620-0557 |
| Primary Part Number | 37187 |
| Item Name | Nut,plain,single Ball Seat,hexag |
| FSC / FSG | 5310 / 53 — Nuts and Washers |
| Manufacturer | Fastenal Company Dba Fastenal Co Div Ilmon |
| Status | ACTIVE |
| Width Across Flats | 0.736 INCHES MINIMUM AND 0.752 INCHES MAXIMUM IN |
| Thread Tolerance Class | 2B INTERNAL |
| Thread Series | UNIFIED NATIONAL COARSE (UNC) |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.500 INCHES IN |
| Nut Height | 0.579 INCHES MINIMUM AND 0.609 INCHES MAXIMUM IN |
| Surface Treatment | ZINC OVERALL EXCEPT INSERT |
| Nut Style | SINGLE BALL SEAT, HEXAGON |
| Thread Class | 2B |
| Thread Quantity Per Inch | 13 |
| Material | STEEL OVERALL EXCEPT INSERT |
| Material | PLASTIC NYLON LOCKING INSERT |
| 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 |
|---|---|
| 37187 PRIMARY | Fastenal Company Dba Fastenal Co Div Ilmon (USA) |
| Reference | Meaning |
|---|---|
| 06A8199990 | 7/2 Vendor item drawing reference Devcom Chemical Biological Center Dba Chemical Biological Center Div U.s. Dept of Army |
NSN 5310-01-620-0557 is a Nut,plain,single Ball Seat,hexag, manufactured by Fastenal Company Dba Fastenal Co Div Ilmon, classified under FSC 5310, Nuts and Washers. Status: active.
NSN 5310-01-620-0557 has 1 manufacturer part number on file: 37187 (Fastenal Company Dba Fastenal Co Div Ilmon).
Key specifications for 37187: Width Across Flats: 0.736 INCHES MINIMUM AND 0.752 INCHES MAXIMUM IN; Thread Tolerance Class: 2B INTERNAL; Thread Series: UNIFIED NATIONAL COARSE (UNC); Thread Direction: RIGHT-HAND. 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.