The Screw,shoulder, cataloged under National Stock Number 5305-00-302-9687, 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 19 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-00-302-9687 |
| Primary Part Number | HT409A4-25 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Head Height | 0.065 INCHES MINIMUM AND 0.067 INCHES MAXIMUM IN |
| Fastener Length | 2.015 INCHES MINIMUM AND 2.062 INCHES MAXIMUM IN |
| Shoulder Length | 1.451 INCHES MINIMUM AND 1.473 INCHES MAXIMUM FIRST SHOULDER IN |
| Surface Treatment Document and Classification | 3-52 FSC-76301 MFR REF SINGLE TREATMENT RESPONSE OVERALL |
| Shoulder Diameter | 0.264 INCHES MINIMUM AND 0.265 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 | 3-52 FSC-76301 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK UNDERCUT |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | CADMIUM OVERALL |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 100.0 DEGREES MINIMUM |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNF |
| Head Diameter | 0.501 INCHES MINIMUM AND 0.506 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 |
|---|---|
| HT409A4-25 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| HT41UA25 PRIMARY | Hi-Shear Corporation (USA) |
| 3M50-4-25 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| HT41UA25 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| Reference | Meaning |
|---|---|
| 54267-4-25 | 5/9 Secondary reference Sps Technologies Inc Unbrako Div |
| HT409A4-25 | 5/9 Secondary reference U.S. Government activity |
| 3M50-4-25 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
NSN 5305-00-302-9687 is a Screw,shoulder, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-302-9687 has 4 manufacturer part numbers on file: HT409A4-25 (Howmet Global Fastening Systems Inc), HT41UA25 (Hi-Shear Corporation), 3M50-4-25 (Sps Technologies, Llc Dba PB Fasteners), HT41UA25 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc).
Key specifications for HT409A4-25: Head Height: 0.065 INCHES MINIMUM AND 0.067 INCHES MAXIMUM IN; Fastener Length: 2.015 INCHES MINIMUM AND 2.062 INCHES MAXIMUM IN; Shoulder Length: 1.451 INCHES MINIMUM AND 1.473 INCHES MAXIMUM FIRST SHOULDER IN; Surface Treatment Document and Classification: 3-52 FSC-76301 MFR REF 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.