The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-175-8770, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is C. E. Machine Co., Inc.. Government technical data includes 12 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-175-8770 |
| Primary Part Number | 520007-1 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | C. E. Machine Co., Inc. |
| Status | ACTIVE |
| Width Across Flats | 0.750 INCHES NOMINAL IN |
| Head Height | 1.000 INCHES MAXIMUM IN |
| Thread Length | 2.500 INCHES MINIMUM IN |
| Nominal Thread Diameter | 1.000 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 8 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 1.500 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 | S |
| Part Number | Manufacturer |
|---|---|
| 520007-1 | C. E. Machine Co., Inc. (USA) |
| 520007-1 | Bek, Inc. Dba Level 1 Fasteners (USA) |
| Reference | Meaning |
|---|---|
| 520007-1 | 3/2 Design control — primary reference U.S. Government activity |
| 520007-1 | 5/9 Secondary reference Shur-Kut Supply Corporation Div Shur-Kut Supply Corp. |
NSN 5305-01-175-8770 is a Screw,cap,socket Head, manufactured by C. E. Machine Co., Inc., classified under FSC 5305, Screws. Status: active.
NSN 5305-01-175-8770 has 2 manufacturer part numbers on file: 520007-1 (C. E. Machine Co., Inc.), 520007-1 (Bek, Inc. Dba Level 1 Fasteners).
1 possible match (shared part number, not a government interchangeability claim): 4430-01-365-6503. Verify interchangeability with system specifications before substitution.
Key specifications for 520007-1: Width Across Flats: 0.750 INCHES NOMINAL IN; Head Height: 1.000 INCHES MAXIMUM IN; Thread Length: 2.500 INCHES MINIMUM IN; Nominal Thread Diameter: 1.000 INCHES IN. 12 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.