The Screw,externally Relieved Body, cataloged under National Stock Number 5305-01-355-2688, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Semco Instruments Inc Div Atlas-Aero Corp., Division of Semco Instruments, Inc.. Government technical data includes 17 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 | 5305-01-355-2688 |
| Primary Part Number | A-4357-10 |
| Item Name | Screw,externally Relieved Body |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Semco Instruments Inc Div Atlas-Aero Corp., Division of Semco Instruments, Inc. |
| Status | ACTIVE |
| Head Height | 0.130 INCHES NOMINAL IN |
| Fastener Length | 0.750 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | MIL-T-10727,TY1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.660 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | PAN NO. 2 |
| Thread Direction | RIGHT-HAND |
| Point Style | FLAT |
| Distance From Largest Bearing Surface of Head to End of First Diameter | 0.090 INCHES NOMINAL IN |
| Externally Relieved Body Diameter Quantity | 1 |
| Surface Treatment | TIN OVERALL |
| Internal Drive Style | SLOT |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 32 |
| Material | COPPER ALLOY OVERALL |
| Thread Series Designator | UNF |
| Head Diameter | 0.350 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 |
|---|---|
| A-4357-10 PRIMARY | Semco Instruments Inc Div Atlas-Aero Corp., Division of Semco Instruments, Inc. (USA) |
NSN 5305-01-355-2688 is a Screw,externally Relieved Body, manufactured by Semco Instruments Inc Div Atlas-Aero Corp., Division of Semco Instruments, Inc., classified under FSC 5305, Screws. Status: active.
NSN 5305-01-355-2688 has 1 manufacturer part number on file: A-4357-10 (Semco Instruments Inc Div Atlas-Aero Corp., Division of Semco Instruments, Inc.).
Key specifications for A-4357-10: Head Height: 0.130 INCHES NOMINAL IN; Fastener Length: 0.750 INCHES NOMINAL IN; Surface Treatment Document and Classification: MIL-T-10727,TY1 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.660 INCHES NOMINAL IN. 17 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.