The Screw,machine, cataloged under National Stock Number 5305-01-249-7631, 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 14 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5305-01-249-7631 |
| Primary Part Number | 711-558877 ITEM #18 |
| Item Name | Screw,machine |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Fastener Length | 1.190 INCHES MINIMUM AND 1.250 INCHES MAXIMUM IN |
| Screw Material Document and Classification | QQ-N-281,CL A FED SPEC SINGLE MATERIAL RESPONSE |
| Thread Length | 1.015 INCHES MINIMUM AND 1.175 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Screw Material | NICKEL ALLOY 400 |
| Minimum Tensile Strength | 80000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | SLOT |
| Countersink Angle | 80.0 DEGREES MINIMUM AND 82.0 DEGREES MAXIMUM |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 20 |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.452 INCHES MINIMUM AND 0.507 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 |
|---|---|
| 711-558877 ITEM #18 PRIMARY | Naval Sea Systems Command (USA) |
| 2270-222 ITEM #18 | Huntington Ingalls Inc Div Newport News Shipbuilding (USA) |
| Reference | Meaning |
|---|---|
| 711-5588877 ITEM 18 | C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command |
NSN 5305-01-249-7631 is a Screw,machine, manufactured by Naval Sea Systems Command, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-249-7631 has 2 manufacturer part numbers on file: 711-558877 ITEM #18 (Naval Sea Systems Command), 2270-222 ITEM #18 (Huntington Ingalls Inc Div Newport News Shipbuilding).
Key specifications for 711-558877 ITEM #18: Fastener Length: 1.190 INCHES MINIMUM AND 1.250 INCHES MAXIMUM IN; Screw Material Document and Classification: QQ-N-281,CL A FED SPEC SINGLE MATERIAL RESPONSE; Thread Length: 1.015 INCHES MINIMUM AND 1.175 INCHES MAXIMUM IN; Nominal Thread Diameter: 0.250 INCHES IN. 14 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.