Lambro Industries 381 Galvanized Worm Gear Clamp 6 in

Product Description

The LAMBRO INDUSTRIES 381 is a 6-inch galvanized worm gear clamp designed to secure flexible duct connections, exhaust transitions, and ventilation fittings in HVAC, dryer venting, and related mechanical installations. The worm gear drive mechanism allows precise tightening around round duct collars and pipe ends, creating a secure, low-vibration hold. The galvanized steel construction provides corrosion resistance in humid or moist service environments. This clamp is a standard fastening component installed by HVAC technicians, sheet metal mechanics, and ventilation contractors during new construction and retrofit work.

The 381 clamp is suited for residential and light commercial ventilation applications where a 6-inch duct diameter is standard. Typical uses include securing flexible dryer exhaust duct to wall transitions, connecting round flex duct to air handler collars, and fastening exhaust vent connectors to appliance outlet spigots. It is sold in a package quantity of 25 units, making it practical for contractors stocking installation hardware for multiple jobs.

Key Features

• 6-inch nominal diameter sizing fits standard round duct and pipe collars
• Worm gear drive allows incremental tightening for a secure, even clamp force
• Galvanized steel construction resists corrosion in humid or damp service environments
• Sold in a package quantity of 25 units for jobsite and van-stock use
• Suitable for flexible duct, rigid round duct collars, and exhaust transition fittings

Compatibility

Designed as an OEM-style installation clamp for 6-inch round duct, flexible exhaust duct, and ventilation fittings in residential and light commercial HVAC and dryer venting systems.

Installation Notes

Installation is typically performed by licensed HVAC technicians or sheet metal contractors. Power down or disconnect all associated appliances before securing duct connections. Use a flat-blade or hex-head screwdriver to drive the worm gear to the appropriate tightness without over-torquing the band. Follow applicable mechanical codes, including IMC and SMACNA duct installation standards, for proper duct fastening requirements.

Technical Specifications

• Nominal Diameter: 6 inches
• Material: Galvanized Steel
• Package Quantity: 25 units per package
• Weight: 4.5 pounds
• Unit of Measure: Each

Standard Information

• Brand: LAMBRO INDUSTRIES
• Manufacturer Part Number: 381