The Screw,shoulder, cataloged under National Stock Number 5305-01-143-4077, 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 18 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-143-4077 |
| Primary Part Number | HT4020-7-13AY |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Head Height | 0.113 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN |
| Fastener Length | 1.453 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN |
| Shoulder Length | 0.682 INCHES MINIMUM AND 0.709 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.4677 INCHES MINIMUM AND 0.4682 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.631 INCHES MINIMUM AND 0.698 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 |
| Surface Treatment | PASSIVATE OVERALL |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| 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 |
|---|---|
| HT4020-7-13AY PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| HT4020-7-13AY PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| 3M902C7-13A PRIMARY | The Boeing Company Div Defense (USA) |
| HT4020-7-13AY PRIMARY | Hi-Shear Corporation (USA) |
| 11879C7-13A | Reid Products Inc. Dba Reid Products Inc (USA) |
| Reference | Meaning |
|---|---|
| 3M902C7-13A | 5/9 Secondary reference Sps Technologies Inc |
| HT4020-7-13AY | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| 3M902C7-13A | 5/2 Secondary reference U.S. Government activity |
| HT4020-7-13AY | 3/2 Design control — primary reference U.S. Government activity |
| HT4020-7-13AY | 5/9 Secondary reference U.S. Government activity |
| HT4020-7-13AY | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-143-4077 is a Screw,shoulder, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-143-4077 has 5 manufacturer part numbers on file: HT4020-7-13AY (Howmet Global Fastening Systems Inc), HT4020-7-13AY (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), 3M902C7-13A (The Boeing Company Div Defense), HT4020-7-13AY (Hi-Shear Corporation), 11879C7-13A (Reid Products Inc. Dba Reid Products Inc).
Key specifications for HT4020-7-13AY: Head Height: 0.113 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN; Fastener Length: 1.453 INCHES MINIMUM AND 1.500 INCHES MAXIMUM IN; Shoulder Length: 0.682 INCHES MINIMUM AND 0.709 INCHES MAXIMUM FIRST SHOULDER IN; Shoulder Diameter: 0.4677 INCHES MINIMUM AND 0.4682 INCHES MAXIMUM FIRST SHOULDER IN. 18 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.