The Screw,shoulder, cataloged under National Stock Number 5305-01-141-7906, 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-141-7906 |
| Primary Part Number | HT4020-6-18AX |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Head Height | 0.109 INCHES MINIMUM AND 0.111 INCHES MAXIMUM IN |
| Fastener Length | 1.750 INCHES MINIMUM AND 1.797 INCHES MAXIMUM IN |
| Shoulder Length | 1.004 INCHES MINIMUM AND 1.026 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.3896 INCHES MINIMUM AND 0.3901 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.615 INCHES MINIMUM AND 0.682 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Material Document and Classification | AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.375 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 | 24 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.756 INCHES MINIMUM AND 0.760 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 |
|---|---|
| HT4020-6-18AX PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| HT4020-6-18AX | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT4020-6-18AX | Huck International, Inc (USA) |
| HT4020-6-18AX | Hi-Shear Corporation (USA) |
| ST3M653C6-18A | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| 10440909 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| ST3M653C6-18A | 5/2 Secondary reference U.S. Government activity |
| HT4020-6-18AX | 5/2 Secondary reference U.S. Government activity |
| HT4020-6-18AX | 5/9 Secondary reference U.S. Government activity |
| HT4020-6-18AX | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-141-7906 is a Screw,shoulder, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-141-7906 has 5 manufacturer part numbers on file: HT4020-6-18AX (Howmet Global Fastening Systems Inc), HT4020-6-18AX (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), HT4020-6-18AX (Huck International, Inc), HT4020-6-18AX (Hi-Shear Corporation), ST3M653C6-18A (The Boeing Company Div Defense).
Key specifications for HT4020-6-18AX: Head Height: 0.109 INCHES MINIMUM AND 0.111 INCHES MAXIMUM IN; Fastener Length: 1.750 INCHES MINIMUM AND 1.797 INCHES MAXIMUM IN; Shoulder Length: 1.004 INCHES MINIMUM AND 1.026 INCHES MAXIMUM FIRST SHOULDER IN; Shoulder Diameter: 0.3896 INCHES MINIMUM AND 0.3901 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.