The Screw,shoulder, cataloged under National Stock Number 5305-01-142-6285, 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through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-142-6285 |
| Primary Part Number | ST3M653C4-18A |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.065 INCHES MINIMUM AND 0.067 INCHES MAXIMUM IN |
| Fastener Length | 1.578 INCHES MINIMUM AND 1.625 INCHES MAXIMUM IN |
| Shoulder Length | 1.048 INCHES MINIMUM AND 1.070 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.2646 INCHES MINIMUM AND 0.2651 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.443 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Material Document and Classification | AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 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 | 28 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.502 INCHES MINIMUM AND 0.507 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 |
|---|---|
| ST3M653C4-18A | Hi-Shear Corporation (USA) |
| ST3M653C4-18A | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M653C4-18A PRIMARY | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| HT4020-4-18AX | C/1 Advisory reference — outside the item-of-supply concept Howmet Global Fastening Systems Inc |
| ST3M653C4-18A | 5/2 Secondary reference U.S. Government activity |
| HT4020-4-18AX | 5/9 Secondary reference U.S. Government activity |
| ST3M653C4-18A | 5/2 Secondary reference U.S. Government activity |
| HT4020-4-18AX | 5/9 Secondary reference Hi-Shear Corporation |
| HT4020-4-18AX | 5/9 Secondary reference U.S. Government activity |
| HT4020-4-18AX | 5/9 Secondary reference U.S. Government activity |
| HT4020-4-18AX | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
NSN 5305-01-142-6285 is a Screw,shoulder, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-142-6285 has 3 manufacturer part numbers on file: ST3M653C4-18A (Hi-Shear Corporation), ST3M653C4-18A (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M653C4-18A (The Boeing Company Div Defense).
Key specifications for ST3M653C4-18A: Head Height: 0.065 INCHES MINIMUM AND 0.067 INCHES MAXIMUM IN; Fastener Length: 1.578 INCHES MINIMUM AND 1.625 INCHES MAXIMUM IN; Shoulder Length: 1.048 INCHES MINIMUM AND 1.070 INCHES MAXIMUM FIRST SHOULDER IN; Shoulder Diameter: 0.2646 INCHES MINIMUM AND 0.2651 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.