The Screw,shoulder, cataloged under National Stock Number 5305-01-163-1981, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Nordex, Incorporated Dba Nordex Inc. Government technical data includes 17 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5305-01-163-1981 |
| Primary Part Number | DBS-A1-18 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Nordex, Incorporated Dba Nordex Inc |
| Status | ACTIVE |
| Width Across Flats | 0.125 INCHES NOMINAL IN |
| Head Height | 0.187 INCHES NOMINAL IN |
| Fastener Length | 0.438 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN |
| Shoulder Length | 0.188 INCHES MINIMUM AND 0.190 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.250 INCHES NOMINAL IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Chamfer Angle | 45.0 DEGREES NOMINAL |
| Internal Drive Style | HEXAGON |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 32 |
| Material | STEEL COMP 303 OVERALL |
| Thread Series Designator | UNF |
| Head Diameter | 0.375 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 |
|---|---|
| DBS-A1-18 | Nordex, Incorporated Dba Nordex Inc (USA) |
| Reference | Meaning |
|---|---|
| DBS-A1-18 | 5/9 Secondary reference Nordex Inc |
| 0N295571 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-163-1981 is a Screw,shoulder, manufactured by Nordex, Incorporated Dba Nordex Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-163-1981 has 1 manufacturer part number on file: DBS-A1-18 (Nordex, Incorporated Dba Nordex Inc).
1 possible match (shared part number, not a government interchangeability claim): 5305-01-320-1041. Verify interchangeability with system specifications before substitution.
Key specifications for DBS-A1-18: Width Across Flats: 0.125 INCHES NOMINAL IN; Head Height: 0.187 INCHES NOMINAL IN; Fastener Length: 0.438 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN; Shoulder Length: 0.188 INCHES MINIMUM AND 0.190 INCHES MAXIMUM FIRST SHOULDER IN. 17 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.