Hex Head Shoulder Bolt

Hex head shoulder bolts are fasteners with an external hexagonal head, an unthreaded cylindrical shoulder and a threaded end. The shoulder provides a bearing surface for locating, pivoting or guiding assembled components, while the threaded section secures the bolt to the mounting part.

Unlike standard hex bolts with threads extending along most of the shank, shoulder bolts use a defined shoulder diameter and length to establish the working interface between connected components. They are used in machinery, tooling, fixtures and mechanical assemblies where the relationship between the shoulder, mating bore and mounting surface affects component movement and alignment.

External Hexagonal Head

The six-sided head accommodates standard hex sockets and wrenches, allowing installation and removal using conventional tools. Head dimensions should be checked against the available tool clearance and assembly space.

Unthreaded Cylindrical Shoulder

The shoulder serves as a bearing, pivot or locating surface. Its diameter, length and surface condition must match the mating component and the intended movement, whether the assembly requires rotation, sliding or fixed positioning.

Defined Threaded End

The threaded section secures the fastener to the mounting component. Metric and Unified thread options can be specified according to the required connection, including thread diameter, pitch or threads per inch, and thread length.

Material and Finish Options

Steel and stainless steel options can be selected according to load requirements, corrosion exposure and manufacturing specifications. Surface treatments must be compatible with the base material, dimensional tolerances and operating environment.

Drawing-Based Customization

For non-standard assemblies, provide a dimensioned drawing specifying the shoulder diameter, shoulder length, head dimensions, thread details, tolerances and material requirements.

Shoulder Diameter and Fit

Match the shoulder diameter and tolerance to the mating bore or bushing. The required clearance depends on whether the assembly is fixed, sliding or rotating. Specify both components' tolerances when fit is critical.

Shoulder Length and Assembly Stack

Check the shoulder length against the thickness of the moving component, spacer or bushing. The design must allow the intended movement without unwanted clamping or axial interference.

Thread Engagement and Mounting Strength

Select the thread size, pitch and engagement length according to the mounting material, applied load and assembly design. The threaded section and mounting substrate must both be considered in the strength calculation.

Material and Mechanical Requirements

Specify the required material grade and mechanical property standard based on the actual load, temperature and operating environment. Do not assume that a particular steel grade or hardness automatically establishes suitability for every application.

Corrosion and Surface Treatment

Choose the material and finish according to moisture, chemicals, temperature and contact conditions. Coating thickness can affect dimensional fit, so critical shoulder surfaces and mating clearances should be considered during specification.

Send your engineering drawing or required dimensions for a quotation review. Include the shoulder diameter, shoulder length, thread specification, material, surface finish, order quantity and annual demand estimate. If the bolt will operate under cyclic loads or in a moving assembly, also provide the application conditions and required fit.
Technical drawings should identify critical dimensions and tolerances so that the proposed fastener can be evaluated against the intended assembly.

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