Engineered for permanent, high-strength installation of duct liner and thermal insulation. Our Cupped Head Weld Pins are designed for use with standard capacitor discharge (CD) stud welding equipment, providing a clean, reliable, and vibration-proof weld that meets SMACNA standards.

Key Features:

Duct Liner Weld Pins, also known as Cup Head Pins, are critical components in both permanent and reusable insulation systems. They are primarily used to provide support and prevent insulation materials from settling or sliding within fabricated blankets and covers. Additionally, they can be applied with a capacitor discharge stud welder to permanently secure insulation to ductwork and other HVAC sheet metal configurations.

• Reliable Insulation Support: Designed to anchor insulation within removable blankets, ensuring uniformity and preventing the insulation from sagging or shifting over time.

• Dual Functionality: While commonly used as a hookless lacing anchor for fabricating blankets, these pins also serve as a weld pin for permanent attachment to metal surfaces.

• Corrosion-Resistant Materials: Manufactured from high-grade 304/316 stainless steel or galvanized steel, providing superior resistance to oxidation, rust, and chemical corrosion in harsh environments.

• Precision Engineering: Available in standard 12 Gauge (2.7mm) and 14 Gauge (2.0mm) pin diameters with sharp tips for easy penetration through insulation without excessive damage.

• Versatile Length Options: Standard lengths of 1″, 1-1/2″, 2-1/2″, and 4-1/2″ accommodate various insulation thicknesses, with custom lengths available upon request.

Application

Our Duct Liner Weld Pins are widely used in commercial and industrial insulation fixing:

• HVAC ductwork – internal and external thermal/acoustic lining

• Industrial piping and vessel insulation

• Power generation and boiler cladding

• Commercial building mechanical rooms

• Removable insulation jackets and blankets (when used with self-locking washers)

Compatible insulation materials:
Mineral wool, fiberglass wool, rockwool, ceramic fiber blankets, and composite insulation boards.

Compatible substrates:
Carbon steel, galvanized steel, and stainless steel (must be conductive for stud welding).

FAQ

• What is the difference between a duct liner pin and a cup head pin?
  These terms are often used interchangeably. “Duct Liner Weld Pin” describes its application (securing duct liner), while “Cupped Head Pin” describes its physical design, featuring a pre-assembled washer that forms a cup-like head .

• What pin length should I choose?
  The pin length should match the thickness of your insulation. For example, a 1/2″ pin is used for 1/2″ insulation, and a 1-1/8″ pin is used for 1-1/8″ high-density liner . Custom lengths are available.

• Can I weld through foil-faced insulation?
  Yes, you must use our pins equipped with a Paper Insulating Washer. This washer prevents the electrical energy from arcing through the foil, ensuring a clean and secure weld .

• Can I place a custom order?
   Yes. Please contact our sales team with your specific requirements, and we will do our best to accommodate them.

• Do you provide samples? How can I get one?
  Yes, samples are available. Please reach out to our sales team with your sample request, and we will arrange shipment promptly.

Customization:
We support full OEM/ODM services. Please contact us for custom pin lengths, washer diameters, and material grades (304/316, Low Carbon Steel) to perfectly match your specific project requirements.