The Screw,externally Relieved Body, cataloged under National Stock Number 5305-01-268-4909, 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 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-268-4909 |
| Primary Part Number | MCS1-1 |
| Item Name | Screw,externally Relieved Body |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Roller Bearing Co of America, Inc Div Pic Design |
| Status | ACTIVE |
| Head Height | 2.0 MILLIMETERS NOMINAL MM |
| Fastener Length | 13.3 MILLIMETERS MINIMUM AND 13.4 MILLIMETERS MAXIMUM MM |
| Thread Length | 4.5 MILLIMETERS NOMINAL MM |
| Nominal Thread Diameter | 3.0 MILLIMETERS MM |
| Head Style | FILLISTER |
| Thread Direction | RIGHT-HAND |
| Externally Relieved Body Diameter Quantity | 1 |
| Internal Drive Style | SLOT |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | M |
| Head Diameter | 5.2 MILLIMETERS NOMINAL MM |
| 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 |
|---|---|
| MCS1-1 PRIMARY | Roller Bearing Co of America, Inc Div Pic Design (USA) |
| Reference | Meaning |
|---|---|
| B86177-001 | 5/9 Secondary reference Thales Uk Limited Dba Thales Uk Ltd Optronics |
NSN 5305-01-268-4909 is a Screw,externally Relieved Body, manufactured by Roller Bearing Co of America, Inc Div Pic Design, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-268-4909 has 1 manufacturer part number on file: MCS1-1 (Roller Bearing Co of America, Inc Div Pic Design).
Key specifications for MCS1-1: Head Height: 2.0 MILLIMETERS NOMINAL MM; Fastener Length: 13.3 MILLIMETERS MINIMUM AND 13.4 MILLIMETERS MAXIMUM MM; Thread Length: 4.5 MILLIMETERS NOMINAL MM; Nominal Thread Diameter: 3.0 MILLIMETERS MM. 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.