The Screw,shoulder, cataloged under National Stock Number 5305-01-045-2539, 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 18 specifications, cited from the U.S. Government catalog. The record lists 6 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 11 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-045-2539 |
| Primary Part Number | WC4011-4-4 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | West Coast Aerospace, Inc. |
| Status | ACTIVE |
| Fastener Length | 0.632 INCHES MINIMUM AND 0.662 INCHES MAXIMUM IN |
| Shoulder Length | 0.176 INCHES MINIMUM AND 0.204 INCHES MAXIMUM FIRST SHOULDER IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Shoulder Diameter | 0.249 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.372 INCHES MINIMUM AND 0.422 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Material Document and Classification | AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | OVAL COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | PASSIVATE OVERALL |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.421 INCHES MINIMUM AND 0.426 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 |
|---|---|
| ST3M506-4-4-1 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT4016-4-4Y | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| WC4011-4-4 PRIMARY | West Coast Aerospace, Inc. (USA) |
| HT4016-4-4Y | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| HT4016-4-4Y | Howmet Global Fastening Systems Inc (USA) |
| HT4016-4-4Y | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| HT4016-4-4Y | 5/9 Secondary reference U.S. Government activity |
| ST3M506-4-4-1 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| ST3M506-4-4-1 | 5/9 Secondary reference Howmet Global Fastening Systems Inc |
| HT4016-4-4Y | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| ST3M506-4-4-1 | 3/2 Design control — primary reference U.S. Government activity |
| HT4016-4-4Y | 5/9 Secondary reference U.S. Government activity |
| HT4016-4-4Y | 5/9 Secondary reference West Coast Aerospace, Inc. |
| ST3M506-4-4-1 | 5/9 Secondary reference Huck International, Inc |
| HT4016-4-4Y | 5/9 Secondary reference Huck International, Inc |
| HT4016-4-4Y | 5/9 Secondary reference U.S. Government activity |
| 10303328 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
NSN 5305-01-045-2539 is a Screw,shoulder, manufactured by West Coast Aerospace, Inc., classified under FSC 5305, Screws. Status: active.
NSN 5305-01-045-2539 has 6 manufacturer part numbers on file: ST3M506-4-4-1 (Fastener Innovation Technology, Inc. Dba F I T), HT4016-4-4Y (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), WC4011-4-4 (West Coast Aerospace, Inc.), HT4016-4-4Y (Sps Technologies Ltd, Tj Brooks Division), HT4016-4-4Y (Howmet Global Fastening Systems Inc) and 1 more.
Key specifications for WC4011-4-4: Fastener Length: 0.632 INCHES MINIMUM AND 0.662 INCHES MAXIMUM IN; Shoulder Length: 0.176 INCHES MINIMUM AND 0.204 INCHES MAXIMUM FIRST SHOULDER IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Shoulder Diameter: 0.249 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM 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.