The Screw,shoulder, cataloged under National Stock Number 5305-00-227-1265, 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 16 specifications, cited from the U.S. Government catalog. The record lists 5 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-00-227-1265 |
| Primary Part Number | HT1030-4-17 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Fastener Length | 1.515 INCHES MINIMUM AND 1.562 INCHES MAXIMUM IN |
| Shoulder Length | 0.957 INCHES MINIMUM AND 0.979 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.280 INCHES MINIMUM AND 0.281 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.443 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Hardness Rating | 24.0 ROCKWELL C MINIMUM AND 44.0 ROCKWELL C MAXIMUM OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Internal Drive Style | OFFSET CRUCIFORM (TORQUE SET) |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | IRON ALLOY 660 OVERALL |
| Thread Series Designator | UNF |
| 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 |
|---|---|
| 55979-4-17 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| HT1030-4-17 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| 3M218-4-17 | The Boeing Company Div Defense (USA) |
| HT42N17 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT42N17 | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| 55979-4-17 | 5/9 Secondary reference Sps Technologies Inc |
| HT1030-4-17 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-00-227-1265 is a Screw,shoulder, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-227-1265 has 5 manufacturer part numbers on file: 55979-4-17 (Sps Technologies, Llc Dba PB Fasteners), HT1030-4-17 (Howmet Global Fastening Systems Inc), 3M218-4-17 (The Boeing Company Div Defense), HT42N17 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), HT42N17 (Hi-Shear Corporation).
Key specifications for HT1030-4-17: Fastener Length: 1.515 INCHES MINIMUM AND 1.562 INCHES MAXIMUM IN; Shoulder Length: 0.957 INCHES MINIMUM AND 0.979 INCHES MAXIMUM FIRST SHOULDER IN; Shoulder Diameter: 0.280 INCHES MINIMUM AND 0.281 INCHES MAXIMUM FIRST SHOULDER IN; Thread Length: 0.443 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN. 16 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.