The Screw,externally Relieved Body, cataloged under National Stock Number 5305-01-255-3059, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Lockheed Martin Corporation Div Rotary and Mission Systems. 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 | 5305-01-255-3059 |
| Primary Part Number | 63B301558P2 |
| Item Name | Screw,externally Relieved Body |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Lockheed Martin Corporation Div Rotary and Mission Systems |
| Status | ACTIVE |
| Head Height | 0.060 INCHES NOMINAL IN |
| Fastener Length | 0.544 INCHES MINIMUM AND 0.575 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | MIL-P-416 TYPE 11,CLASS 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.180 INCHES MINIMUM IN |
| Material Document and Classification | AISI B112 ASSN STD SINGLE MATERIAL RESPONSE OR AISI C1215 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| First Diameter From Head | 0.122 INCHES MINIMUM AND 0.124 INCHES MAXIMUM IN |
| Distance From Largest Bearing Surface of Head to End of Second Diameter | 0.290 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.112 INCHES IN |
| Thread Direction | RIGHT-HAND |
| Second Diameter From Head | 0.085 INCHES MINIMUM AND 0.095 INCHES MAXIMUM IN |
| Width Between Flats | 0.203 INCHES MINIMUM AND 0.235 INCHES MAXIMUM IN |
| Distance From Largest Bearing Surface of Head to End of First Diameter | 0.069 INCHES MINIMUM AND 0.079 INCHES MAXIMUM IN |
| Externally Relieved Body Diameter Quantity | 2 |
| Surface Treatment | CADMIUM OVERALL |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 40 |
| Material | STEEL OVERALL |
| 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 |
|---|---|
| 63B301558P2 PRIMARY | Lockheed Martin Corporation Div Rotary and Mission Systems (USA) |
NSN 5305-01-255-3059 is a Screw,externally Relieved Body, manufactured by Lockheed Martin Corporation Div Rotary and Mission Systems, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-255-3059 has 1 manufacturer part number on file: 63B301558P2 (Lockheed Martin Corporation Div Rotary and Mission Systems).
Key specifications for 63B301558P2: Head Height: 0.060 INCHES NOMINAL IN; Fastener Length: 0.544 INCHES MINIMUM AND 0.575 INCHES MAXIMUM IN; Surface Treatment Document and Classification: MIL-P-416 TYPE 11,CLASS 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.180 INCHES MINIMUM 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.