Stripper Shoulder Bolt

Stripper shoulder bolts, also called stripper bolts or shoulder screws, are precision fasteners with a cylindrical unthreaded shoulder between the head and threaded section. The shoulder serves as a locating surface, pivot or guide for moving components in stamping dies, tooling fixtures and mechanical assemblies.

Unlike conventional bolts, shoulder bolts use the smooth shoulder to position mating parts and support contact or movement. The shoulder diameter, length, tolerance and surface finish determine how the bolt fits with a bushing, plate or rotating component. Correct sizing is important when the assembly is exposed to repeated movement or transverse loads.

Standard and custom configurations can be specified according to engineering drawings, including shoulder dimensions, thread size, head geometry, material and surface treatment.

Precision Shoulder Geometry: The cylindrical shoulder provides a defined locating or bearing surface. Shoulder diameter tolerance should be matched to the mating bore and required clearance.

Socket Head Design: An internal hex drive allows installation with a hex key or socket tool, making it suitable for assemblies with limited access.

Material Options: Alloy steel and stainless steel can be selected according to strength requirements, corrosion exposure and operating conditions.

Controlled Thread and Fillet Geometry: Thread dimensions and the under-head transition affect assembly fit and stress distribution. These features should follow the applicable product drawing or standard.

Surface Finish Options: Black oxide and zinc plating are potential finishes for compatible steel grades. Stainless steel fasteners may be supplied with suitable passivation when specified.

Shoulder Diameter and Fit: Match the shoulder diameter tolerance to the mating bore or bushing. The required clearance depends on whether the joint is fixed, sliding or rotating.

Shoulder Length and Shear Plane: Select a shoulder length that accommodates the connected parts and places the intended shear plane on the smooth shoulder rather than the threaded section.

Material and Heat Treatment: Choose the material and hardness according to the design load, wear conditions, operating temperature and applicable engineering requirements. Hardness alone does not establish fatigue life or load capacity.

Thread and Installation: Confirm thread diameter, pitch, engagement length and available tool clearance. Avoid substituting metric and inch threads without verifying compatibility.

Corrosion Protection: Select the surface finish according to moisture, lubricant exposure and other environmental conditions. Coating thickness and dimensional effects should be considered where close fits are required.

Inspection requirements should be defined by the product drawing, purchase specification and applicable standards.

Dimensional inspection can cover shoulder diameter, shoulder length, head dimensions and overall length using suitable measuring instruments. Thread gauges can verify the specified thread size and pitch. Hardness testing should follow the agreed method when hardness requirements apply.

Material certificates and heat-treatment records can be requested when required by the purchasing specification. Inspection reports should identify the measured characteristics and acceptance criteria. Specific inspection frequency, traceability scope and testing capabilities should be confirmed with the manufacturer before they are stated as standard production procedures.

For a quotation, submit the engineering drawing or part number, required dimensions, material and finish, order quantity and delivery requirements. Include any applicable standards, inspection requirements and operating conditions so the specification can be reviewed before production.

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