The Screw,machine, cataloged under National Stock Number 5305-01-599-7637, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Mcmaster-Carr Supply Co. 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-599-7637 |
| Primary Part Number | 90920A550 |
| Item Name | Screw,machine |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Mcmaster-Carr Supply Co |
| Status | ACTIVE |
| Head Height | 0.153 INCHES NOMINAL IN |
| Screw Surface Treatment | ZINC |
| Fastener Length | 1.847 INCHES NOMINAL IN |
| Thread Length | 1.847 INCHES NOMINAL IN |
| Shank Surface Treatment | ZINC |
| Hardness Rating | 60.0 ROCKWELL B MINIMUM |
| Bearing Surface of Head Surface Treatment | ZINC |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Surface Treatment | ANODIZE |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Screw Material | STEEL |
| Minimum Tensile Strength | 60000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | TORX |
| Countersink Angle | 82.0 DEGREES NOMINAL |
| Thread Class | 2A A |
| Thread Quantity Per Inch | A20 |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.477 INCHES NOMINAL 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 |
|---|---|
| 90920A550 PRIMARY | Mcmaster-Carr Supply Co (USA) |
NSN 5305-01-599-7637 is a Screw,machine, manufactured by Mcmaster-Carr Supply Co, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-599-7637 has 1 manufacturer part number on file: 90920A550 (Mcmaster-Carr Supply Co).
Key specifications for 90920A550: Head Height: 0.153 INCHES NOMINAL IN; Screw Surface Treatment: ZINC; Fastener Length: 1.847 INCHES NOMINAL IN; Thread Length: 1.847 INCHES NOMINAL IN. 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.