The Screw,shoulder, cataloged under National Stock Number 5305-01-209-9372, 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 20 specifications, cited from the U.S. Government catalog. The record lists 10 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-209-9372 |
| Primary Part Number | ST3M495-4-20-1 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.015 INCHES MAXIMUM IN |
| Fastener Length | 1.632 INCHES MINIMUM AND 1.662 INCHES MAXIMUM IN |
| Shoulder Length | 1.183 INCHES MINIMUM AND 1.211 INCHES MAXIMUM FIRST SHOULDER IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Shoulder Diameter | 0.2646 INCHES MINIMUM AND 0.2651 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.372 INCHES MINIMUM AND 0.422 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 | FILLISTER COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 125000 POUNDS PER SQUARE INCH LBS |
| 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 | 0.3898 INCHES MINIMUM AND 0.3948 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 |
|---|---|
| ST3M495-4-20-1 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT4016-4-20X | Howmet Global Fastening Systems Inc (USA) |
| 11911-4-20-1 | Reid Products Inc. Dba Reid Products Inc (USA) |
| HT4016-4-20X | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M495-4-20-1 | West Coast Aerospace, Inc. (USA) |
| HT4016-4-20X | Hi-Shear Corporation (USA) |
| ST3M495-4-20-1 | Howmet Global Fastening Systems Inc (USA) |
| HT4016-4-20X | Huck International, Inc (USA) |
| ST3M495-4-20-1 | Huck International, Inc (USA) |
| ST3M495-4-20-1 PRIMARY | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| HT4016-4-20X | 5/2 Secondary reference U.S. Government activity |
| HT4016-4-20X | 5/9 Secondary reference U.S. Government activity |
| HT4016-4-20X | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| HT4016-4-20X | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-209-9372 is a Screw,shoulder, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-209-9372 has 10 manufacturer part numbers on file: ST3M495-4-20-1 (Fastener Innovation Technology, Inc. Dba F I T), HT4016-4-20X (Howmet Global Fastening Systems Inc), 11911-4-20-1 (Reid Products Inc. Dba Reid Products Inc), HT4016-4-20X (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M495-4-20-1 (West Coast Aerospace, Inc.) and 5 more.
Key specifications for ST3M495-4-20-1: Head Height: 0.015 INCHES MAXIMUM IN; Fastener Length: 1.632 INCHES MINIMUM AND 1.662 INCHES MAXIMUM IN; Shoulder Length: 1.183 INCHES MINIMUM AND 1.211 INCHES MAXIMUM FIRST SHOULDER IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL. 20 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.