The Screw,shoulder, cataloged under National Stock Number 5305-01-581-2920, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Genuine Parts Company Div Automotive Parts Group, Dba Napa. Government technical data includes 15 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5305-01-581-2920 |
| Primary Part Number | PZ-35-3 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Genuine Parts Company Div Automotive Parts Group, Dba Napa |
| Status | ACTIVE |
| Width Across Flats | 0.156 INCHES NOMINAL IN |
| Fastener Length | 0.813 INCHES NOMINAL IN |
| Shoulder Length | 0.375 INCHES NOMINAL FIRST SHOULDER IN |
| Shoulder Diameter | 0.374 INCHES NOMINAL FIRST SHOULDER IN |
| Thread Length | 0.438 INCHES NOMINAL IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Internal Drive Style | HEXAGON |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL COMP 303 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.500 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 |
NSN 5305-01-581-2920 is a Screw,shoulder, manufactured by Genuine Parts Company Div Automotive Parts Group, Dba Napa, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-581-2920 has 2 manufacturer part numbers on file: PZ-35-3 (Genuine Parts Company Div Automotive Parts Group, Dba Napa), PZ-35-3 (Motion Industries, Inc. Dba Motion Industries Div Oxnard).
Key specifications for PZ-35-3: Width Across Flats: 0.156 INCHES NOMINAL IN; Fastener Length: 0.813 INCHES NOMINAL IN; Shoulder Length: 0.375 INCHES NOMINAL FIRST SHOULDER IN; Shoulder Diameter: 0.374 INCHES NOMINAL FIRST SHOULDER 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.