CUSTOM & PRECISION SHOULDER BOLTS MANUFACTURER

Our shoulder bolts are manufactured to your specifications, including shoulder length, diameter, thread size, and undercut geometry. These components are often used as precision mounting pins, pivot shafts, or motion guides—applications where variation simply isn’t acceptable. That’s why we machine each feature, rather than relying on heading or forging processes that struggle to hold the tolerances required.
We routinely produce shoulder bolts in carbon steel, stainless steel (including 303 and 416), and other alloys based on the demands of your environment—corrosion resistance, strength, or temperature performance. Options for custom threading, hex heads, slotted drive ends, or surface treatments (like passivation or black oxide) are available based on application needs. From compact bolts for medical devices to large-format fasteners used in heavy equipment, Triangle has the flexibility and tooling to meet the full range of requirements.

Shoulder bolts—sometimes referred to as stripper bolts—are used where controlled movement or precise part positioning is critical. Commonly found in tooling assemblies, mechanical linkages, automation systems, and rotating subassemblies, these bolts serve as alignment and bearing surfaces within larger machines. In many cases, the shoulder acts as a precision guide for bearings, bushings, or spacers, while the threaded section provides secure fastening without affecting motion.

Triangle’s precision shoulder bolts are machined to eliminate runout and ensure proper fit between moving parts. This is especially important in dynamic assemblies where a misaligned shoulder can lead to premature wear, vibration, or failure. Our bolts are built to minimize friction, support repeatable part positioning, and maintain axial control under load—all while withstanding the demands of industrial use. By machining to spec rather than forming or swaging, we deliver parts that not only install with confidence but perform reliably across their full service life.

Customers choose Triangle Machine Products because they understand the cost of inconsistency. When a shoulder bolt is used to guide movement or retain alignment, a loose fit or out-of-tolerance transition can compromise the entire assembly. At Triangle, we take precision seriously—our bolts are machined from bar stock with close attention to shoulder diameter, concentricity, thread quality, and surface finish.

We don’t try to compete with mass production on volume—we compete on fit, function, and repeatability. For customers who need reliable fasteners that won’t loosen, bind, or misalign over time, our machining-first approach makes the difference. Whether your bolt needs to hold a die set in perfect alignment, act as a bearing shaft in a rotating arm, or simply lock components together with precise spacing, Triangle’s shoulder bolts offer confidence from start to finish.