The Screw,shoulder, cataloged under National Stock Number 5305-01-198-6450, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. Government technical data includes 18 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-198-6450 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Status | ACTIVE |
| Head Height | 0.140 INCHES NOMINAL IN |
| Fastener Length | 0.329 INCHES NOMINAL IN |
| Shoulder Length | 0.141 INCHES MINIMUM AND 0.157 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.180 INCHES NOMINAL FIRST SHOULDER IN |
| Thread Length | 0.188 INCHES NOMINAL IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Criticality Code Justification | ZZZY |
| Material Document and Classification | QQ-B-637,ALLOY 464,HALF HARD FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.125 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.312 INCHES NOMINAL IN |
| Internal Drive Style | W/O INTERNAL DRIVE |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 40 |
| Material | COPPER ALLOY 464 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Reference Number Differentiating Characteristics | MATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL,MANUFACTURING AND TESTING SPECIFICATIONS |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | C |
| Reference | Meaning |
|---|---|
| 20406-A | 3/1 Design control — primary reference Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa |
| 5330-F PC37 | 5/1 Secondary reference Atwood & Morrill Co., Inc. Dba Weir Valves and Controls Usa |
NSN 5305-01-198-6450 is a Screw,shoulder, classified under FSC 5305, Screws. Status: active.
Key specifications for 5305-01-198-6450: Head Height: 0.140 INCHES NOMINAL IN; Fastener Length: 0.329 INCHES NOMINAL IN; Shoulder Length: 0.141 INCHES MINIMUM AND 0.157 INCHES MAXIMUM FIRST SHOULDER IN; Shoulder Diameter: 0.180 INCHES NOMINAL FIRST SHOULDER IN. 18 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.