The Screw,shoulder, cataloged under National Stock Number 5305-01-048-1139, 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 15 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-048-1139 |
| Primary Part Number | ST3M506-8-9 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Fastener Length | 1.195 INCHES MINIMUM AND 1.242 INCHES MAXIMUM IN |
| Shoulder Length | 0.443 INCHES MINIMUM AND 0.463 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.531 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.623 INCHES MINIMUM AND 0.690 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Internal Drive Style | HIGH-TORQUE |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Diameter | 0.720 INCHES MINIMUM AND 0.787 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 |
|---|---|
| ST3M506-8-9 | Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc (USA) |
| STM3M506-8-9 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| HT4011-8-9 | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| HT4011-8-9 | Huck International, Inc (USA) |
| HT4011-8-9 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HT4011-8-9 | Hi-Shear Corporation (USA) |
| ST3M506-8-9 PRIMARY | The Boeing Company Div Defense (USA) |
| HT4011-8-9 | West Coast Aerospace, Inc. (USA) |
| ST3M506-8-9 | Huck International, Inc (USA) |
| HT4011-8-9 | Howmet Global Fastening Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| HT4011-8-9 | 5/9 Secondary reference Sps Technologies Inc |
| ST3M506-8-9 | 5/2 Secondary reference U.S. Government activity |
| HT4011-8-9 | 5/2 Secondary reference U.S. Government activity |
| HT4011-8-9 | 5/9 Secondary reference U.S. Government activity |
| HT4011-8-9 | 5/9 Secondary reference U.S. Government activity |
NSN 5305-01-048-1139 is a Screw,shoulder, manufactured by The Boeing Company Div Defense, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-048-1139 has 10 manufacturer part numbers on file: ST3M506-8-9 (Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc), STM3M506-8-9 (Fastener Innovation Technology, Inc. Dba F I T), HT4011-8-9 (Sps Technologies Ltd, Tj Brooks Division), HT4011-8-9 (Huck International, Inc), HT4011-8-9 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc) and 5 more.
Key specifications for ST3M506-8-9: Fastener Length: 1.195 INCHES MINIMUM AND 1.242 INCHES MAXIMUM IN; Shoulder Length: 0.443 INCHES MINIMUM AND 0.463 INCHES MAXIMUM FIRST SHOULDER IN; Shoulder Diameter: 0.531 INCHES MAXIMUM FIRST SHOULDER IN; Thread Length: 0.623 INCHES MINIMUM AND 0.690 INCHES MAXIMUM IN. 15 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.