The Screw,shoulder, cataloged under National Stock Number 5305-01-045-4305, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 18 specifications, cited from the U.S. Government catalog. The record lists 8 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-045-4305 |
| Primary Part Number | ST3M506-4-6-1 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Fastener Length | 0.757 INCHES MINIMUM AND 0.878 INCHES MAXIMUM IN |
| Shoulder Length | 0.301 INCHES MINIMUM AND 0.329 INCHES MAXIMUM FIRST SHOULDER IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Shoulder Diameter | 0.2802 INCHES MINIMUM AND 0.2807 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 | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| 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 |
|---|---|
| HT4016-4-6Y | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M506-4-6-1 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT4016-4-6Y | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| ST3M506-4-6-1 PRIMARY | The Boeing Company Div Defense (USA) |
| WC4011-4-6 | West Coast Aerospace, Inc. (USA) |
| HT4016-4-6Y | Hi-Shear Corporation (USA) |
| HT4016-4-6Y | Huck International, Inc (USA) |
| HT4016-4-6Y | Howmet Global Fastening Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| HT4016-4-6Y | 5/2 Secondary reference U.S. Government activity |
| HT4016-4-6Y | 5/9 Secondary reference U.S. Government activity |
| HT4016-4-6Y | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| HT4016-4-6Y | 5/9 Secondary reference U.S. Government activity |
| 10114899 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
NSN 5305-01-045-4305 is a Screw,shoulder, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-045-4305 has 8 manufacturer part numbers on file: HT4016-4-6Y (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M506-4-6-1 (Fastener Innovation Technology, Inc. Dba F I T), HT4016-4-6Y (Sps Technologies Ltd, Tj Brooks Division), ST3M506-4-6-1 (The Boeing Company Div Defense), WC4011-4-6 (West Coast Aerospace, Inc.) and 3 more.
Key specifications for ST3M506-4-6-1: Fastener Length: 0.757 INCHES MINIMUM AND 0.878 INCHES MAXIMUM IN; Shoulder Length: 0.301 INCHES MINIMUM AND 0.329 INCHES MAXIMUM FIRST SHOULDER IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Shoulder Diameter: 0.2802 INCHES MINIMUM AND 0.2807 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.