Shoulder bolts, also called shoulder screws, are precision-engineered steel fasteners distinguished with an unthreaded cylindrical shoulder section between the head and the threaded portion. The smooth, unthreaded shoulder (shaft) allows the bolts to act as a pivot while securely fastening different components together. A shoulder screw offers higher tolerances and is used with other fasteners and washers for reliable movement needs. These bolts allow easy removal and tightening using slotted drivers or hex. Additionally, shoulder screws and bolts come in various lengths, thread types, materials, and head shapes to meet multiple fastening needs.
Why Buy Shoulder Screws?
There are several compelling reasons to choose shoulder bolts for specific applications. Their most notable advantage is that they provide accurate alignment of mating parts. The close-tolerance shoulder acts as a pivot or guide, ensuring consistent and smooth movement in mechanical assemblies. Furthermore, shoulder socket screws can function as shafts or axles for rotating components like pulleys, gears, and bearings. Additionally, the unthreaded shoulder also prevents thread damage to the components it passes through, making them a worthwhile and versatile investment.
View Our Best-in-Class Shoulder Bolts:
Our selection of premium-quality steel metric shoulder bolts offers precision for your critical applications. We stock both shoulder screws with Hex and round socket shoulder designs. The hex socket shoulder bolt provides a secure and non-slip driving surface for installation and removal using a standard Allen wrench. The round socket shoulder offers a smooth, continuous bearing surface.
Typical Uses of Shoulder Screws:
Shoulder screws and bolts are typically used in a variety of mechanical applications where precise alignment and controlled movement is required. They are used in industries like electronics, automotive, aerospace, robotics, and tooling for a variety of purposes, such as:
- Die and Mould Making
- Mechanical Assemblies
- Bearing and Pulley Mounts
- Linear Slides and Guides
- Indexing Mechanisms
- Machinery and Automation
- Fixturing.
