The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-718-9188, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 15 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 5305-01-718-9188 |
| Primary Part Number | ERH547-1117A161-1 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Head Inside Diameter | 0.312 INCHES NOMINAL IN |
| Head Height | 0.302 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN |
| Fastener Length | 1.745 INCHES MINIMUM AND 1.755 INCHES MAXIMUM IN |
| Thread Length | 0.5000 INCHES NOMINAL IN |
| Material Document and Classification | QQ-N-281 CL A AEROSPACE MATERIAL SPEC STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.625 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 96906-NAS-51975 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 13 |
| Material | NICKEL ALLOY OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.853 INCHES MINIMUM AND 0.875 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 |
|---|---|
| ERH547-1117A161-1 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| MS51975K45 | 3/2 Design control — primary reference U.S. Government activity |
| 218102055 | 5/9 Secondary reference U.S. Government activity |
| MS51975K45 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-718-9188 is a Screw,cap,socket Head, manufactured by Naval Sea Systems Command, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-718-9188 has 1 manufacturer part number on file: ERH547-1117A161-1 (Naval Sea Systems Command).
2 possible matches (shared part number, not a government interchangeability claim): 5305-01-719-0469, 5305-01-722-0171. Verify interchangeability with system specifications before substitution.
Key specifications for ERH547-1117A161-1: Head Inside Diameter: 0.312 INCHES NOMINAL IN; Head Height: 0.302 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN; Fastener Length: 1.745 INCHES MINIMUM AND 1.755 INCHES MAXIMUM IN; Thread Length: 0.5000 INCHES NOMINAL IN. 15 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.