The Screw,externally Relieved Body, cataloged under National Stock Number 5305-00-207-4199, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Lockheed Martin Corporation Div Rms - Mitchel Field. Government technical data includes 19 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. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-00-207-4199 |
| Primary Part Number | 310450 |
| Item Name | Screw,externally Relieved Body |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Lockheed Martin Corporation Div Rms - Mitchel Field |
| Status | ACTIVE |
| Head Height | 0.114 INCHES NOMINAL IN |
| Fastener Length | 0.511 INCHES NOMINAL IN |
| Thread Length | 0.219 INCHES MINIMUM AND 0.234 INCHES MAXIMUM IN |
| Material Document and Classification | QQ-S-763,CL 7,TY A FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| First Diameter From Head | 0.160 INCHES MINIMUM AND 0.165 INCHES MAXIMUM IN |
| Distance From Largest Bearing Surface of Head to End of Second Diameter | 0.277 INCHES MINIMUM AND 0.292 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.099 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Second Diameter From Head | 0.065 INCHES MINIMUM AND 0.070 INCHES MAXIMUM IN |
| Width Between Flats | 0.188 INCHES NOMINAL IN |
| Distance From Largest Bearing Surface of Head to End of First Diameter | 0.230 INCHES NOMINAL IN |
| Externally Relieved Body Diameter Quantity | 2 |
| Surface Treatment | PASSIVATE OVERALL |
| Internal Drive Style | SLOT |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 48 |
| Material | STEEL COMP 303 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| 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 |
|---|---|
| 310450 PRIMARY | Lockheed Martin Corporation Div Rms - Mitchel Field (USA) |
NSN 5305-00-207-4199 is a Screw,externally Relieved Body, manufactured by Lockheed Martin Corporation Div Rms - Mitchel Field, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-207-4199 has 1 manufacturer part number on file: 310450 (Lockheed Martin Corporation Div Rms - Mitchel Field).
4 possible matches (shared part number, not a government interchangeability claim): 2840-00-703-9385, 5930-01-244-4941, 5985-01-590-9814. Verify interchangeability with system specifications before substitution.
Key specifications for 310450: Head Height: 0.114 INCHES NOMINAL IN; Fastener Length: 0.511 INCHES NOMINAL IN; Thread Length: 0.219 INCHES MINIMUM AND 0.234 INCHES MAXIMUM IN; Material Document and Classification: QQ-S-763,CL 7,TY A FED SPEC SINGLE MATERIAL RESPONSE OVERALL. 19 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.