Precision Shoulder Bolt

Precision shoulder bolts are threaded fasteners with an unthreaded cylindrical shoulder that serves as a locating surface, pivot, or bearing surface in mechanical assemblies. The shoulder establishes the positioning distance between the head and the threaded mounting section, while the thread secures the fastener to the mating component.

Unlike conventional bolts, shoulder bolts use the cylindrical section to locate moving or stationary components. Selection depends on shoulder diameter, shoulder length, thread size, fit requirements, material, and operating loads. They are used in tooling fixtures, machinery linkages, conveyor mechanisms, and automation equipment where the dimensions of the locating surface affect assembly fit and movement.

Custom precision shoulder bolts can be specified by engineering drawing, including non-standard shoulder dimensions, thread lengths, head configurations, and surface finishes.

Ground Shoulder Surface: Precision grinding can be specified for shoulder diameters requiring controlled dimensions and surface finish. Actual tolerances depend on nominal diameter and the agreed drawing.

Defined Shoulder Geometry: Shoulder diameter and length determine the fit and spacing of mounted components. Head dimensions and the shoulder-to-thread transition should also be considered during design.

Material Selection: Alloy steel and stainless steel options support different strength, hardness, and corrosion-resistance requirements. Final properties depend on the selected material condition and manufacturing process.

Custom Thread Configurations: Metric and inch-series threads can be specified according to the required diameter, pitch, thread length, and applicable thread standard.

Drawing-Based Production: Custom dimensions, head styles, and surface treatments can be defined through 2D drawings, 3D models, or approved samples.

Shoulder Diameter and Fit: Specify the nominal diameter, dimensional tolerance, and mating-hole tolerance. A clearance fit may be appropriate for rotation or sliding, while a tighter fit may be required for fixed location. The correct fit depends on the assembly design.

Shoulder Length: Calculate the required length from the thickness of the mounted components and the intended clearance. The shoulder should provide the required bearing surface without causing the threaded section to interfere with the moving component.

Thread Engagement: Select thread diameter, pitch, and engagement length according to the mating material, applied load, and available installation space. Do not assume the thread should carry shear loads when the design intends the shoulder to act as the load-bearing section.

Material and Environment: Alloy steel may be suitable for applications requiring specified mechanical properties. Stainless steel may be selected for moisture exposure or certain corrosive environments, subject to chemical compatibility and mechanical requirements.

Surface Treatment and Inspection: Specify coating type and any applicable thickness, corrosion, or dimensional requirements. Confirm whether material certificates, hardness tests, thread gauges, or dimensional inspection reports are required for each batch.

Send your drawings or specifications, including shoulder dimensions, thread size, material, surface finish, and order quantity, to receive a quotation for your precision shoulder bolts.

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