The Screw,close Tolerance, cataloged under National Stock Number 5305-01-494-8024, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is West Coast Aerospace, Inc.. Government technical data includes 15 specifications, cited from the U.S. Government catalog. The record lists 7 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-494-8024 |
| Primary Part Number | WC4020-5-15D |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | West Coast Aerospace, Inc. |
| Status | ACTIVE |
| Head Height | 0.0878 INCHES MINIMUM AND 0.0898 INCHES MAXIMUM IN |
| Fastener Length | 1.453 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN |
| Thread Length | 0.531 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.3125 INCHES IN |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.928 INCHES MINIMUM AND 0.948 INCHES MAXIMUM IN |
| Grip Diameter | 0.3115 INCHES MINIMUM AND 0.3120 INCHES MAXIMUM IN |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.6287 INCHES MINIMUM AND 0.6335 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 | X |
| Part Number | Manufacturer |
|---|---|
| WC4020-5-15D PRIMARY | West Coast Aerospace, Inc. (USA) |
| HT4020-5-15D PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| HT4020-5-15 | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| HT4020-5-15 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M652C5-15D PRIMARY | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT4020-5-15 PRIMARY | Hi-Shear Corporation (USA) |
| HT4020-5-15D PRIMARY | Huck International, Inc (USA) |
| Reference | Meaning |
|---|---|
| HT4020-5-15 | 3/2 Design control — primary reference U.S. Government activity |
| ST3M652C5-15D | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
NSN 5305-01-494-8024 is a Screw,close Tolerance, manufactured by West Coast Aerospace, Inc., classified under FSC 5305, Screws. Status: active.
NSN 5305-01-494-8024 has 7 manufacturer part numbers on file: WC4020-5-15D (West Coast Aerospace, Inc.), HT4020-5-15D (Howmet Global Fastening Systems Inc), HT4020-5-15 (Sps Technologies Ltd, Tj Brooks Division), HT4020-5-15 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M652C5-15D (Fastener Innovation Technology, Inc. Dba F I T) and 2 more.
Key specifications for WC4020-5-15D: Head Height: 0.0878 INCHES MINIMUM AND 0.0898 INCHES MAXIMUM IN; Fastener Length: 1.453 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN; Thread Length: 0.531 INCHES NOMINAL IN; Nominal Thread Diameter: 0.3125 INCHES 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.