The Screw,shoulder, cataloged under National Stock Number 5305-01-142-8406, 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 4 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-142-8406 |
| Primary Part Number | HT4020-4-7AY |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Head Height | 0.058 INCHES MINIMUM AND 0.060 INCHES MAXIMUM IN |
| Fastener Length | 0.890 INCHES MINIMUM AND 0.937 INCHES MAXIMUM IN |
| Shoulder Length | 0.368 INCHES MINIMUM AND 0.390 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.2802 INCHES MINIMUM AND 0.2807 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.442 INCHES MINIMUM AND 0.509 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 | FLAT COUNTERSUNK UNDERCUT |
| 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 JOINT FINE (UNJF) |
| Head Diameter | 0.502 INCHES MINIMUM AND 0.507 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 |
|---|---|
| HT4020-4-7AY PRIMARY | Hi-Shear Corporation (USA) |
| HT4020-4-7AY PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT4020-4-7AY PRIMARY | Huck International, Inc. Div Huck Products Division (USA) |
| 11879C4-7A | Reid Products Inc. Dba Reid Products Inc (USA) |
| Reference | Meaning |
|---|---|
| HT4020-4-7AY | C/1 Advisory reference — outside the item-of-supply concept Fastener Innovation Technology, Inc. Dba F I T |
| HT4020-4-7AY | 5/9 Secondary reference U.S. Government activity |
| HT4020-4-7AY | 5/9 Secondary reference U.S. Government activity |
| HT4020-4-7AY | 3/2 Design control — primary reference U.S. Government activity |
| 3M902C4-7A | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
NSN 5305-01-142-8406 is a Screw,shoulder, manufactured by Hi-Shear Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-142-8406 has 4 manufacturer part numbers on file: HT4020-4-7AY (Hi-Shear Corporation), HT4020-4-7AY (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), HT4020-4-7AY (Huck International, Inc. Div Huck Products Division), 11879C4-7A (Reid Products Inc. Dba Reid Products Inc).
Key specifications for HT4020-4-7AY: Head Height: 0.058 INCHES MINIMUM AND 0.060 INCHES MAXIMUM IN; Fastener Length: 0.890 INCHES MINIMUM AND 0.937 INCHES MAXIMUM IN; Shoulder Length: 0.368 INCHES MINIMUM AND 0.390 INCHES MAXIMUM FIRST SHOULDER IN; 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.