The Screw,shoulder, cataloged under National Stock Number 5305-01-141-7909, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 17 specifications, cited from the U.S. Government catalog. The record lists 3 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5305-01-141-7909 |
| Primary Part Number | ST3M653C6-15A |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.109 INCHES MINIMUM AND 0.111 INCHES MAXIMUM IN |
| Fastener Length | 1.562 INCHES MINIMUM AND 1.609 INCHES MAXIMUM IN |
| Shoulder Length | 0.817 INCHES MINIMUM AND 0.839 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.3896 INCHES MINIMUM AND 0.3901 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.614 INCHES MINIMUM AND 0.681 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 |
|---|---|
| ST3M653C6-15A PRIMARY | The Boeing Company Div Defense (USA) |
| HT4020-6-15AX | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT4020-6-15AX | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| HT4020-6-15AX | C/1 Advisory reference — outside the item-of-supply concept Howmet Global Fastening Systems Inc |
| ST3M653C6-15A | 5/2 Secondary reference U.S. Government activity |
| HT4020-6-15AX | 5/2 Secondary reference U.S. Government activity |
| HT4020-6-15AX | 5/9 Secondary reference U.S. Government activity |
| HT4020-6-15AX | 5/9 Secondary reference U.S. Government activity |
| HT4020-6-15AX | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
NSN 5305-01-141-7909 is a Screw,shoulder, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-141-7909 has 3 manufacturer part numbers on file: ST3M653C6-15A (The Boeing Company Div Defense), HT4020-6-15AX (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), HT4020-6-15AX (Hi-Shear Corporation).
Key specifications for ST3M653C6-15A: Head Height: 0.109 INCHES MINIMUM AND 0.111 INCHES MAXIMUM IN; Fastener Length: 1.562 INCHES MINIMUM AND 1.609 INCHES MAXIMUM IN; Shoulder Length: 0.817 INCHES MINIMUM AND 0.839 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.