The Screw,externally Relieved Body, cataloged under National Stock Number 5305-01-042-4961, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Grimes Aerospace Company. Government technical data includes 16 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-042-4961 |
| Primary Part Number | A8188-1 |
| Item Name | Screw,externally Relieved Body |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Grimes Aerospace Company |
| Status | ACTIVE |
| Head Height | 0.125 INCHES NOMINAL IN |
| Fastener Length | 0.687 INCHES NOMINAL IN |
| Thread Length | 0.372 INCHES MINIMUM AND 0.374 INCHES MAXIMUM IN |
| First Diameter From Head | 0.154 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | PAN NO. 2 |
| Thread Direction | RIGHT-HAND |
| Distance From Largest Bearing Surface of Head to End of First Diameter | 0.156 INCHES NOMINAL IN |
| Externally Relieved Body Diameter Quantity | 1 |
| Surface Treatment | CADMIUM OR CADMIUM AND CHROMATE OR CADMIUM AND PHOSPHATE OVERALL |
| Internal Drive Style | SLOT |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 20 |
| Material | COPPER ALLOY 360 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.250 INCHES NOMINAL IN |
| 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 |
|---|---|
| A8188-1 PRIMARY | Grimes Aerospace Company (USA) |
NSN 5305-01-042-4961 is a Screw,externally Relieved Body, manufactured by Grimes Aerospace Company, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-042-4961 has 1 manufacturer part number on file: A8188-1 (Grimes Aerospace Company).
Key specifications for A8188-1: Head Height: 0.125 INCHES NOMINAL IN; Fastener Length: 0.687 INCHES NOMINAL IN; Thread Length: 0.372 INCHES MINIMUM AND 0.374 INCHES MAXIMUM IN; First Diameter From Head: 0.154 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN. 16 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.