The Screw,shoulder, cataloged under National Stock Number 5305-01-238-3191, 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 19 specifications, cited from the U.S. Government catalog. The record lists 5 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-238-3191 |
| Primary Part Number | HT4020-3-4AY |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| Status | ACTIVE |
| Head Height | 0.032 INCHES MINIMUM AND 0.034 INCHES MAXIMUM IN |
| Fastener Length | 0.640 INCHES MINIMUM AND 0.687 INCHES MAXIMUM IN |
| Shoulder Length | 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.2177 INCHES MINIMUM AND 0.2182 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.380 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Material Document and Classification | AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 125000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| 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 | 0.376 INCHES MINIMUM AND 0.381 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 |
|---|---|
| HT4020-3-4AY PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| 3M902C3-4A PRIMARY | The Boeing Company Div Defense (USA) |
| 11879C3-4A | Reid Products Inc. Dba Reid Products Inc (USA) |
| HT4020-3-4AY PRIMARY | Hi-Shear Corporation (USA) |
| 3M902C3-4A | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| Reference | Meaning |
|---|---|
| HT4020-3-4AY | 5/9 Secondary reference U.S. Government activity |
| CHT4020-3-4AY | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| HT4020-3-4AY | 3/2 Design control — primary reference U.S. Government activity |
| CHT4020-3-4AY | C/1 Advisory reference — outside the item-of-supply concept Deutsch Co the |
| HT4020-3-4AY | 5/9 Secondary reference U.S. Government activity |
| 3M902C3-4A | 5/2 Secondary reference U.S. Government activity |
| HT4020-3-4AY | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| CHT4020-3-4AY | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
NSN 5305-01-238-3191 is a Screw,shoulder, manufactured by Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-238-3191 has 5 manufacturer part numbers on file: HT4020-3-4AY (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), 3M902C3-4A (The Boeing Company Div Defense), 11879C3-4A (Reid Products Inc. Dba Reid Products Inc), HT4020-3-4AY (Hi-Shear Corporation), 3M902C3-4A (Fastener Innovation Technology, Inc. Dba F I T).
Key specifications for HT4020-3-4AY: Head Height: 0.032 INCHES MINIMUM AND 0.034 INCHES MAXIMUM IN; Fastener Length: 0.640 INCHES MINIMUM AND 0.687 INCHES MAXIMUM IN; Shoulder Length: 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM FIRST SHOULDER IN; Shoulder Diameter: 0.2177 INCHES MINIMUM AND 0.2182 INCHES MAXIMUM FIRST SHOULDER IN. 19 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.