The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-237-9371, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Roller Bearing Co of America, Inc Div Pic Design. Government technical data includes 14 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5305-01-237-9371 |
| Primary Part Number | YS-21 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Roller Bearing Co of America, Inc Div Pic Design |
| Status | ACTIVE |
| Width Across Flats | 0.125 INCHES MINIMUM AND 0.155 INCHES MAXIMUM IN |
| Head Height | 0.164 INCHES MINIMUM AND 0.174 INCHES MAXIMUM IN |
| Fastener Length | 0.250 INCHES MINIMUM AND 0.280 INCHES MAXIMUM IN |
| Thread Length | 0.188 INCHES MINIMUM AND 0.280 INCHES MAXIMUM IN |
| Material Document and Classification | MIL-M-20693,COMP A,TY 1 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.164 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Internal Drive Style | HEXAGON |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 32 |
| Material | PLASTIC POLYHEXAMETHYLENE ADIPAMIDE OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.255 INCHES MINIMUM AND 0.275 INCHES MAXIMUM 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 |
|---|---|
| YS-21 PRIMARY | Roller Bearing Co of America, Inc Div Pic Design (USA) |
| Reference | Meaning |
|---|---|
| 5305-010-0001 | 7/2 Vendor item drawing reference Textron Systems Corporation Dba Textron Systems Corp |
NSN 5305-01-237-9371 is a Screw,cap,socket Head, manufactured by Roller Bearing Co of America, Inc Div Pic Design, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-237-9371 has 1 manufacturer part number on file: YS-21 (Roller Bearing Co of America, Inc Div Pic Design).
Key specifications for YS-21: Width Across Flats: 0.125 INCHES MINIMUM AND 0.155 INCHES MAXIMUM IN; Head Height: 0.164 INCHES MINIMUM AND 0.174 INCHES MAXIMUM IN; Fastener Length: 0.250 INCHES MINIMUM AND 0.280 INCHES MAXIMUM IN; Thread Length: 0.188 INCHES MINIMUM AND 0.280 INCHES MAXIMUM IN. 14 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.