The Screw,shoulder, cataloged under National Stock Number 5305-01-045-9644, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Hi-Shear Corporation. Government technical data includes 18 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-045-9644 |
| Primary Part Number | HT4016-4-16Y |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Fastener Length | 1.382 INCHES MINIMUM AND 1.412 INCHES MAXIMUM IN |
| Shoulder Length | 0.936 INCHES MINIMUM AND 0.944 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 | 32 |
| 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 |
|---|---|
| HT4016-4-16Y PRIMARY | Hi-Shear Corporation (USA) |
| HT4016-4-16Y PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| WC4011-4-16 PRIMARY | West Coast Aerospace, Inc. (USA) |
| HT4016-4-16Y | Howmet Global Fastening Systems Inc (USA) |
| ST3M506-4-16-1 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT4016-4-16Y | Huck International, Inc (USA) |
| ST3M506-4-16-1 | West Coast Aerospace, Inc. (USA) |
| Reference | Meaning |
|---|---|
| HT4016-4-16Y | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| HT4016-4-16Y | 5/9 Secondary reference U.S. Government activity |
| HT4016-4-16Y | 5/2 Secondary reference U.S. Government activity |
| ST3M506-4-16-1 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| HT4016-4-16Y | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-045-9644 is a Screw,shoulder, manufactured by Hi-Shear Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-045-9644 has 7 manufacturer part numbers on file: HT4016-4-16Y (Hi-Shear Corporation), HT4016-4-16Y (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), WC4011-4-16 (West Coast Aerospace, Inc.), HT4016-4-16Y (Howmet Global Fastening Systems Inc), ST3M506-4-16-1 (Fastener Innovation Technology, Inc. Dba F I T) and 2 more.
Key specifications for HT4016-4-16Y: Fastener Length: 1.382 INCHES MINIMUM AND 1.412 INCHES MAXIMUM IN; Shoulder Length: 0.936 INCHES MINIMUM AND 0.944 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.