Shoulder bolts, sometimes referred to as shoulder screws, are precision-engineered fasteners designed with an unthreaded cylindrical section, known as the shoulder, between the head and the threaded portion. This design allows for accurate spacing, smooth movement, and reliable alignment in assemblies where precision is essential.

Our range includes popular standards such as ISO 7379, DIN 923, and DIN 927, covering a variety of precision shoulder bolt styles to suit demanding applications. Whether you require the close tolerances of ISO 7379 for machinery and tooling, the flat-head profile of DIN 923, or the slotted-drive style of DIN 927, we provide options that ensure accuracy and long-term performance.

Available in A2 Stainless Steel for corrosion resistance or 12.9-Grade Unplated Steel for maximum strength, these shoulder bolts are well suited to environments ranging from high-load mechanical assemblies to cleanroom-grade equipment. Common uses include tool and die work, automated machinery, robotics, automotive linkages, and any situation where components need to pivot, slide, or be spaced with precision.

Selecting the right shoulder bolt involves considering the shoulder diameter to match your hole size, the shoulder length to fit the thickness of your parts, the thread size for compatibility, and the material for the conditions in which it will operate. Our stocked range covers both metric and imperial sizes, allowing you to find the exact fit for your application.

What is a Shoulder Bolt Used For?

A shoulder bolt is used when a component needs to rotate, pivot, or slide smoothly while being securely fastened. The shoulder acts as a precise guide or bearing surface, making these bolts ideal for machinery, tooling, jigs, fixtures, and moving mechanical assemblies.

What is the Difference Between a Shoulder Bolt and a Regular Bolt?

Unlike a regular bolt, which is fully threaded or mostly threaded, a shoulder bolt has a large, smooth, unthreaded section between the head and the threads. This shoulder allows for precision spacing and smooth movement without damaging surrounding parts.

How Do I Choose the Right Shoulder Bolt?

To select the correct shoulder bolt, measure your hole diameter to determine the shoulder size, match the shoulder length to your material thickness, ensure the thread size matches your tapped hole or nut, and choose a material that suits your operating environment.

What Standards Are Available for Shoulder Bolts?

We stock shoulder bolts manufactured to ISO 7379, DIN 923, and DIN 927 standards, giving you a choice of different head styles, drive types, and tolerances to suit your specific requirements.