Shoulder Screws

shoulder screwsMonroe EFI, headquartered in Canton, MA, offers a wide range of specialty fasteners. Shoulder screws are one of those interesting fasteners designed for very specific uses. Also known as shoulder bolts and stripper bolts, these fasteners are machine screws with an integral shoulder or journal between the head and thread and are used extensively in industries from aerospace to consumer products because of their versatility and unique attributes when installed.

Because of their unique properties, youll find shoulder screws used in a variety of applications and industries, including:

  • Automotive
  • Medical
  • Storage
  • Plastic mold injection
  • Electronics

The construction of these screws makes them particularly useful for rotary movement applications, such as shafts for rotating bushings and bearings. Other uses include as guides, axles, and pivot points.

Shoulder screws feature three main sections: head, shoulder, and thread. The head has the largest diameter, the shoulder is described by its diameter and length, and the thread has a major diameter slightly smaller than the shoulder diameter. What makes these screws unique is the mechanical components the shoulders can accommodate. Bearings mounted on shoulders create simple cam followers. Pulleys, gears, and sprockets can rotate at moderate speeds on shoulders. Shoulder-mounted springs can preload components traveling axially along the length of the shoulder.

Shoulder screws can be made from a variety of materials including hardened alloy steel, mild steel, stainless steel, brass, and plastic. Here are a few of the most common:

  • Stainless steels, including:
    • 303 most commonly used, with good corrosion-resistance
    • 316 better corrosion resistance, good for marine applications
    • 17-4 PH can be heat-treated for greater hardness
    • 416 stronger than 300 series steels
  • Alloy steel the original steel used, common in commercial-grade screws
  • Mild steel less expensive than stainless, good for light-duty applications
  • Brass natural lubricity makes it good for sliding and rotating applications, good for light-duty
  • Plastics considered commercial grade, plastic screws offer excellent high-volume pricing

Its important to know that you can choose the head type, shoulder length, thread length, and other variables that best fit your application. If necessary, custom shoulder screws service area can be quickly and inexpensively produced by screw machines for small quantities or cold headers for large quantities. To learn more about options and availability, contact the experts at Monroe EFI.

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