Gripnail is a proven mechanical fastener used to attach insulation to the inside of sheet metal duct work. It was specifically designed to fasten acoustical duct liner to the inside of heating, ventilation and air conditioning duct work. This operation generally takes place when the duct work is being manufactured. The hardened tapered teeth pierce the duct liner and form a positive attachment to the sheet metal.

Each fastener is precisely formed to exacting quality control standards and they may be applied with a variety of tools or equipment. The beveled edge retaining cap is designed to depress the surface of the insulation without tearing or cutting into it. The nail does not protrude from the cap, eliminating air stream noise or interfering with air displacement in the duct. Gripnails only work when the sheet metal is supported by a hardened base plate or the anvil of a Gripnailer®. Gripnails will not fatigue or be physically affected by vibrations normally found in high velocity air handling systems.

Gripnail meet or exceed the latest SMACNA (Sheet Metal and Air Conditioning Contractors National Association) standards, published in their HVAC DUCT CONSTRUCTION STANDARDS - METAL AND FLEXIBLE, for low and high velocity ductwork. Gripnails are used by leading air conditioning, sheet metal and mechanical contractors for ductwork in commercial, residential and industrial buildings.

308239 - 4 Pails w/ (1,000) 1/2" Gripnails (50S), 1/2" Insulation (All Densities)
308233 - 1 Pail w/ (5,000) 1/2" Gripnails (50B), 1/2" Insulation (All Densities)
308235 - 4 Pails w/ (1,000) 5/8" Gripnails (100S), 1" Insulation (1-1/2 lb. Density)
308229 - 1 Pail w/ (5,000) 5/8" Gripnails (100B), 1" Insulation (1-1/2 lb. Density)
308230 - 1 Pail w/ (5,000) 3/4" Gripnails (120B), 1" Insulation (3 lb. Density)