4" insulation pins are a specific size of duct insulation pins that are commonly used in various insulation applications. These pins are typically longer than standard pins, providing additional support for thicker insulation materials or for applications where greater holding power is required.

The 4" length of these pins allows them to penetrate deeper into the duct surface and insulation, ensuring a secure hold. They are often used in industrial or commercial settings where larger ducts and thicker insulation are common.

These pins can be made of different materials, such as stainless steel or plastic. Stainless steel 4" pins are highly durable and resistant to corrosion, making them suitable for harsh environments. Plastic pins are lightweight and cost-effective, and can be a good choice for less demanding applications.

When installing 4" insulation pins, it's important to follow proper installation procedures to ensure the insulation is held firmly in place. Use a hammer or staple gun to drive the pins through the insulation and into the duct. Make sure the pins are evenly spaced and firmly attached to provide consistent support.

Overall, 4" insulation pins are a useful tool for securing insulation in a variety of settings. Their longer length provides added stability and holding power, making them an ideal choice for thicker insulation or larger ductwork.