The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-689-4087, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier. Government technical data includes 7 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-689-4087 |
| Primary Part Number | 31000-558 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier |
| Status | ACTIVE |
| Fastener Length | 2.500 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.750 INCHES IN |
| Surface Treatment | ZINC OVERALL |
| Minimum Tensile Strength | 180000 POUNDS PER SQUARE INCH LBS |
| Thread Quantity Per Inch | 10 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNRC |
| 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 |
|---|---|
| 113957 (ZR) | Sps Technologies Inc Unbrako Div (USA) |
| 113957 (Z) | Sps Technologies Inc Unbrako Div (USA) |
| 31000-558 PRIMARY | Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier (USA) |
NSN 5305-01-689-4087 is a Screw,cap,socket Head, manufactured by Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-689-4087 has 3 manufacturer part numbers on file: 113957 (ZR) (Sps Technologies Inc Unbrako Div), 113957 (Z) (Sps Technologies Inc Unbrako Div), 31000-558 (Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier).
Key specifications for 31000-558: Fastener Length: 2.500 INCHES NOMINAL IN; Nominal Thread Diameter: 0.750 INCHES IN; Special Features: SCREW CAP, SOCKET HEAD, 3/4-10 UNRC-3A, 2.5" LONG, ALLOY STEEL; FINISH: YELLOW ZINC PLATE; MINIMUM TENSILE STRENGTH: 180,000 PSI A; Surface Treatment: ZINC OVERALL. 7 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.