The world of fasteners offers a diverse range of solutions for securing components and creating space in various applications. For situations involving thin sheet metal, where access from both sides might be limited, self-clinching standoffs emerge as a reliable and permanent choice. Among these standoffs, BSO (Blind Standoff Open), BSOS (Blind Standoff Open Stainless Steel), and BSO4 (a variation) stand out for their efficiency and ease of use. This blog dives deep into these standoffs, exploring their types, materials, size charts, applications, and why Fastenko.com should be your one-stop shop for all your BSO needs.

Understanding Self-Clinching Standoffs

BSO, BSOS, and BSO4 represent different variations of self-clinching standoffs. These innovative fasteners function by being pressed into a precisely sized hole in the sheet metal. A squeezing force is then applied, causing the standoff to deform and "clinch" onto the material. This cold-flow process creates a strong, permanent bond, essentially turning the standoff into an integral part of the sheet metal.

Key Benefits of Self-Clinching Standoffs:

  • Strong and Permanent: The cold-flow clinching process ensures a secure and vibration-resistant connection, ideal for applications requiring long-term stability.
  • Single-Sided Access: Unlike traditional standoffs that require access from both sides, BSO standoffs excel in situations with limited accessibility, making them perfect for electronic enclosures, HVAC systems, and countless other scenarios.
  • Versatility: These standoffs serve multiple purposes: mounting components, creating space between panels, and stacking PCBs (Printed Circuit Boards).
  • Flush Finish (Optional): Many BSO standoffs offer a flush finish on both sides of the sheet metal for a clean and aesthetically pleasing design.

Types of BSO Standoffs:

  • BSO (Blind Standoff Open): This is the most common type, typically made from steel with a zinc plating for general-purpose applications.
  • BSOS (Blind Standoff Open Stainless Steel): A variation of BSO specifically crafted from stainless steel for enhanced corrosion resistance in harsh environments.
  • BSO4: While less common, BSO4 might represent a specific model variation or a manufacturer's designation for a particular BSO type. It's always best to consult the product datasheet for detailed information.

Understanding Standoff Terminology:

To navigate the world of BSO standoffs effectively, let's break down some key terms:

  • Thread Size: This refers to the size of the internal threads that accept screws or threaded rods for attaching components. Common sizes typically range from M2 to M10 (Metric) and 4-40 UNC to 1/4-20 UNC (Unified Coarse & Fine).
  • Body Diameter: This is the overall diameter of the standoff body.
  • Standoff Length: This indicates the distance between the sheet metal and the top of the standoff, providing space for components.
  • Hole Diameter: This is the size of the hole required in the sheet metal for installation.

Material Options for BSO Standoffs:

The choice of material for your BSO standoffs depends on your application's specific needs. Here are some common options:

  • Steel Zinc Plated: A cost-effective option for general-purpose applications.
  • Stainless Steel SS-304: Provides excellent corrosion resistance for harsh environments.
  • Aluminium: Ideal for weight reduction when weight is a critical factor in your design.
Thread Size (Metric) Thread Size (Unified Coarse & Fine) Body Diameter (mm) Hole Diameter (mm) Minimum Sheet Thickness (mm) Standoff Length (mm)
M3.5 - 4.70 3.70 0.80 3 - 20+
M4 - 5.20 4.20 0.80 3 - 20+
M5 - 6.00 4.80 1.00 3 - 20+
M6 - 7.00 5.50 1.00 3 - 20+
M8 - 9.00 7.00 1.20 3 - 20+
M10 - 11.00 9.00 1.50 3 - 20+
- 4-40 UNC 3.20 2.50 0.50 3 - 20+
- 4-40 UNC 3.20 2.80 0.60 3 - 20+
- 6-32 UNC 4.20 3.20 0.70 3 - 20+
- 8-32 UNC 4.80 3.70 0.80 3 - 20+
- 10-24 UNC 5.50 4.20 1.00 3 - 20+
- 1/4-20 UNC 6.30 4.80 1.00 3 - 20+
- 5/16-18 UNC 8.00 6.00 1.20 3 - 20+
- 3/8-16 UNC 9.50 7.00 1.50 3 - 20+
Applications for BSO Standoffs:

BSO standoffs find application in a wide range of industries due to their versatility and ease of use. Here are some common examples:

  • Electronic Enclosures: They provide a reliable way to mount PCBs, house components, and create space for internal wiring.
  • HVAC Systems: BSO standoffs can be used to secure ductwork components, sensors, and control panels.
  • Automotive Applications: They offer a permanent solution for mounting interior components and creating space for wiring harnesses.
  • Medical Devices: BSO standoffs can be used in applications where weight reduction and corrosion resistance are crucial.
  • Furniture Manufacturing: These standoffs can be used to assemble furniture components and create space for panels.

Why Choose Fastenko.com for Your BSO Standoffs?

FastenKo.com is your one-stop shop for all your BSO standoff needs. We offer a wide variety of BSO standoffs (including BSOS and potential BSO4 variations) from reputable manufacturers. Here's what sets us apart:

  • Extensive Selection: We carry a vast selection of BSO standoffs in various materials, thread sizes, and body lengths to meet your specific requirements.
  • Competitive Prices: We offer competitive pricing on all our BSO standoffs, ensuring you get the best value for your money.
  • Fast Shipping: We understand the importance of getting your project completed on time. That's why we offer fast shipping options to get your BSO standoffs to you quickly.
  • Expert Support: Our knowledgeable customer support team is always happy to answer your questions and help you choose the right BSO standoffs for your application.

Ready to Get Started with BSO Standoffs?

Browse our extensive selection of BSO standoffs on Fastenko.com today! We offer a user-friendly website that allows you to easily filter products based on your specific needs. If you have any questions or require assistance, don't hesitate to contact our expert customer support team. We're here to help you