The Screw,shoulder, cataloged under National Stock Number 5305-01-268-5972, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. Government technical data includes 17 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-268-5972 |
| Primary Part Number | HT4020-4-8X |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Head Height | 0.065 INCHES MINIMUM AND 0.067 INCHES MAXIMUM IN |
| Fastener Length | 0.953 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN |
| Shoulder Length | 0.433 INCHES MINIMUM AND 0.435 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.264 INCHES MINIMUM AND 0.265 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.469 INCHES NOMINAL 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 |
| 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 | 0.456 INCHES MINIMUM AND 0.508 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 |
|---|---|
| HT4020-4-8X | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT4020-4-8X | Hi-Shear Corporation (USA) |
| ST3M653C4-8D | Hi-Shear Corporation (USA) |
| ST3M653C4-8D | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT4020-4-8X PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| ST3M653C4-8D | 5/2 Secondary reference U.S. Government activity |
| HT4020-4-8X | 5/2 Secondary reference U.S. Government activity |
| ST3M653C4-8D | 5/2 Secondary reference U.S. Government activity |
| HT4020-4-8X | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| HT4020-4-8X | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-268-5972 is a Screw,shoulder, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-268-5972 has 5 manufacturer part numbers on file: HT4020-4-8X (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), HT4020-4-8X (Hi-Shear Corporation), ST3M653C4-8D (Hi-Shear Corporation), ST3M653C4-8D (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), HT4020-4-8X (Howmet Global Fastening Systems Inc).
Key specifications for HT4020-4-8X: Head Height: 0.065 INCHES MINIMUM AND 0.067 INCHES MAXIMUM IN; Fastener Length: 0.953 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN; Shoulder Length: 0.433 INCHES MINIMUM AND 0.435 INCHES MAXIMUM FIRST SHOULDER IN; Shoulder Diameter: 0.264 INCHES MINIMUM AND 0.265 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.