The Screw,shoulder, cataloged under National Stock Number 5305-01-084-5409, 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 19 specifications, cited from the U.S. Government catalog. The record lists 8 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-084-5409 |
| Primary Part Number | ST3M653C3-4A |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.039 INCHES MINIMUM AND 0.041 INCHES MAXIMUM IN |
| Fastener Length | 0.640 INCHES MINIMUM AND 0.687 INCHES MAXIMUM IN |
| Shoulder Length | 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM FIRST SHOULDER IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Shoulder Diameter | 0.202 INCHES MINIMUM AND 0.203 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.380 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Material Document and Classification | AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | PASSIVATE OVERALL |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.338 INCHES MINIMUM AND 0.381 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 |
|---|---|
| HT4020-3-4AX | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT4020-3-4AX | Huck International, Inc (USA) |
| ST3M653C3-4A | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT4020-3-4AX | Howmet Global Fastening Systems Inc (USA) |
| HT4020-3-4AX | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| ST3M653C3-4A PRIMARY | The Boeing Company Div Defense (USA) |
| WC4020-3-4AX | West Coast Aerospace, Inc. (USA) |
| HT4020-3-4AX | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| HT4020-3-4AX | 5/2 Secondary reference U.S. Government activity |
| ST3M653-3-4A | 5/9 Secondary reference The Boeing Company Div Defense |
| HT4020-3-4AX | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| HT4020-3-4AX | 5/9 Secondary reference U.S. Government activity |
| ST3M653-3-4AX | 5/9 Secondary reference The Boeing Company Div Defense |
| HT4020-3-4AX | 5/9 Secondary reference U.S. Government activity |
| ST3M653C3-4A | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-084-5409 is a Screw,shoulder, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-084-5409 has 8 manufacturer part numbers on file: HT4020-3-4AX (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), HT4020-3-4AX (Huck International, Inc), ST3M653C3-4A (Fastener Innovation Technology, Inc. Dba F I T), HT4020-3-4AX (Howmet Global Fastening Systems Inc), HT4020-3-4AX (Sps Technologies Ltd, Tj Brooks Division) and 3 more.
Key specifications for ST3M653C3-4A: Head Height: 0.039 INCHES MINIMUM AND 0.041 INCHES MAXIMUM IN; Fastener Length: 0.640 INCHES MINIMUM AND 0.687 INCHES MAXIMUM IN; Shoulder Length: 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM FIRST SHOULDER IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL. 19 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.