The Screw,shoulder, cataloged under National Stock Number 5305-00-446-1598, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is De Havilland Aircraft of Canada Limited. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-00-446-1598 |
| Primary Part Number | C4CM1986-1 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | De Havilland Aircraft of Canada Limited |
| Status | ACTIVE |
| Head Height | 0.060 INCHES NOMINAL IN |
| Fastener Length | 1.680 INCHES NOMINAL IN |
| Shoulder Length | 0.188 INCHES NOMINAL FIRST SHOULDER IN |
| Shoulder Diameter | 0.375 INCHES NOMINAL FIRST SHOULDER IN |
| Thread Length | 0.320 INCHES MINIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Shank Unthreaded Hole Diameter | 0.076 INCHES NOMINAL FIRST HOLE IN |
| Material Document and Classification | MIL-S-6758,PHYSICAL COND. F,SURFACE COND. 4 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | CADMIUM OVERALL |
| Internal Drive Style | SLOT |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL COMP 4130 OVERALL |
| Thread Series Designator | UNF |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 0.170 INCHES NOMINAL FIRST HOLE IN |
| Head Diameter | 0.520 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 |
|---|---|
| C4CM1986-1 PRIMARY | De Havilland Aircraft of Canada Limited (CAN) |
| Reference | Meaning |
|---|---|
| 5306AC1-003 | 5/2 Secondary reference U.S. Government activity |
NSN 5305-00-446-1598 is a Screw,shoulder, manufactured by De Havilland Aircraft of Canada Limited, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-446-1598 has 1 manufacturer part number on file: C4CM1986-1 (De Havilland Aircraft of Canada Limited).
Key specifications for C4CM1986-1: Head Height: 0.060 INCHES NOMINAL IN; Fastener Length: 1.680 INCHES NOMINAL IN; Shoulder Length: 0.188 INCHES NOMINAL FIRST SHOULDER IN; Shoulder Diameter: 0.375 INCHES NOMINAL FIRST SHOULDER 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.