Carlisle 157b Weld-on Welding Pins 1.5 Inches 3000 Per Pail

Product Description

The CARLISLE 157b Weld-On welding pin is a carbon alloy steel fastener designed to attach insulation to sheet metal substrates in commercial and industrial HVAC applications. Each pin measures 1.5 inches and is cold-formed with a hardened steel tip that resists blunting or flattening on contact. That sharp point pierces most insulation substrates cleanly, producing a stronger weld with fewer sparks compared to standard welding pins. The cold-form hardening process gives the tip a steel temper that holds up under repeated application cycles. These pins are applied using any conventional portable or automatic resistance welding unit, making them compatible with standard field and shop workflows.

CARLISLE 157b pins are used in commercial HVAC duct insulation work and industrial insulation installations where a permanent, immediate mechanical connection to a metal substrate is required. The cupped head washer style is engineered to compress the insulation surface evenly without tearing the facing material, which is especially important when working with fiberglass or foam insulation boards. This pail contains 3,000 pins, making it suitable for large-volume duct lining and insulation board attachment jobs on commercial projects.

Key Features

• Cold-formed hardened steel tip resists blunting and flattening during welding
• Sharp point pierces most insulation substrates with consistent positive contact
• Produces fewer sparks, reducing risk of igniting adhesives or burning substrates
• Cup style head depresses insulation surface without tearing facing material
• Compatible with any conventional portable or automatic resistance welding unit
• Bulk pail of 3,000 pins for high-volume commercial insulation work

Compatibility

Designed for use with standard portable and automatic resistance welding units for attachment of insulation to sheet metal substrates in commercial and industrial HVAC duct systems.

Installation Notes

Installation is typically performed by sheet metal workers or commercial HVAC insulation technicians. Disconnect or de-energize the welding unit before loading pins and verify the welding tip condition before beginning a run. Follow the welding unit manufacturer's settings for pin gauge and substrate thickness. Keep ignition sources and adhesive materials clear of the work area, as welding operations generate sparks even when using low-spark pin designs.

Technical Specifications

• Pin Length: 1.5 inches
• Material: Carbon alloy steel
• Head Style: Cup style washer
• Quantity Per Pail: 3,000
• Package Type: Pail
• Manufacturer Part Number (Alt): 307099

Standard Information

• Brand: CARLISLE
• Manufacturer Part Number: 157b