The Screw,shoulder, cataloged under National Stock Number 5305-01-143-4080, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc. Government technical data includes 17 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-143-4080 |
| Primary Part Number | HT4020-7-17AX |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| Status | ACTIVE |
| Head Height | 0.124 INCHES MINIMUM AND 0.127 INCHES MAXIMUM IN |
| Fastener Length | 1.703 INCHES MINIMUM AND 1.750 INCHES MAXIMUM IN |
| Shoulder Length | 0.925 INCHES MINIMUM AND 0.948 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.4521 INCHES MINIMUM AND 0.4526 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.630 INCHES MINIMUM AND 0.697 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Material Document and Classification | AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.438 INCHES IN |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.881 INCHES MINIMUM AND 0.888 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 |
|---|---|
| HT4020-7-17AX PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT4020-7-17AX PRIMARY | Hi-Shear Corporation (USA) |
| ST3M653C7-17A PRIMARY | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| HT4020-7-17AX | 3/2 Design control — primary reference U.S. Government activity |
| HT4020-7-17AX | 5/9 Secondary reference U.S. Government activity |
| HT4020-7-17AX | 5/9 Secondary reference U.S. Government activity |
| HT4020-7-17AX | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| HT4020-7-17AX | C/1 Advisory reference — outside the item-of-supply concept Howmet Global Fastening Systems Inc |
| ST3M653C7-17A | 5/2 Secondary reference U.S. Government activity |
NSN 5305-01-143-4080 is a Screw,shoulder, manufactured by Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-143-4080 has 3 manufacturer part numbers on file: HT4020-7-17AX (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), HT4020-7-17AX (Hi-Shear Corporation), ST3M653C7-17A (The Boeing Company Div Defense).
Key specifications for HT4020-7-17AX: Head Height: 0.124 INCHES MINIMUM AND 0.127 INCHES MAXIMUM IN; Fastener Length: 1.703 INCHES MINIMUM AND 1.750 INCHES MAXIMUM IN; Shoulder Length: 0.925 INCHES MINIMUM AND 0.948 INCHES MAXIMUM FIRST SHOULDER IN; Shoulder Diameter: 0.4521 INCHES MINIMUM AND 0.4526 INCHES MAXIMUM FIRST SHOULDER IN. 17 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.