The Screw,shoulder, cataloged under National Stock Number 5305-01-141-7905, 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 13 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-141-7905 |
| Primary Part Number | HT4020-6-20AX |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| Status | ACTIVE |
| Head Height | 0.109 INCHES MINIMUM AND 0.111 INCHES MAXIMUM IN |
| Fastener Length | 1.875 INCHES MINIMUM AND 1.922 INCHES MAXIMUM IN |
| Shoulder Length | 1.129 INCHES MINIMUM AND 1.151 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 |
|---|---|
| HT4020-6-20AX | Sps Technologies, Llc Dba PB Fasteners (USA) |
| HT4020-6-20AX PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M653C6-20A PRIMARY | The Boeing Company Div Defense (USA) |
| ST3M653C6-20A | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M653C6-20A | Houston Precision Fasteners I Lp (USA) |
| ST3M653C6-20A | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| HT4020-6-20AX | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| 11927C6-20A | Reid Products Inc. Dba Reid Products Inc (USA) |
| ST3M653C6-20A | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| HT4020-6-20AX PRIMARY | Hi-Shear Corporation (USA) |
| ST3M653C6-20A | Heartland Precision Fasteners Inc (USA) |
| HT4020-6-20AX | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| WC4020-6-20AX | West Coast Aerospace, Inc. (USA) |
| Reference | Meaning |
|---|---|
| HT4020-6-20AX | C/1 Advisory reference — outside the item-of-supply concept Howmet Global Fastening Systems Inc |
| HT4020-6-20AX | 3/2 Design control — primary reference U.S. Government activity |
| HT4020-6-20AX | 5/9 Secondary reference U.S. Government activity |
| HT4020-6-20AX | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| HT4020-6-20AX | 5/9 Secondary reference U.S. Government activity |
| ST3M653C6-20A | 5/2 Secondary reference U.S. Government activity |
NSN 5305-01-141-7905 is a Screw,shoulder, manufactured by Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-141-7905 has 13 manufacturer part numbers on file: HT4020-6-20AX (Sps Technologies, Llc Dba PB Fasteners), HT4020-6-20AX (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M653C6-20A (The Boeing Company Div Defense), ST3M653C6-20A (Fastener Innovation Technology, Inc. Dba F I T), ST3M653C6-20A (Houston Precision Fasteners I Lp) and 8 more.
Key specifications for HT4020-6-20AX: Head Height: 0.109 INCHES MINIMUM AND 0.111 INCHES MAXIMUM IN; Fastener Length: 1.875 INCHES MINIMUM AND 1.922 INCHES MAXIMUM IN; Shoulder Length: 1.129 INCHES MINIMUM AND 1.151 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.