Lambro Industries 284L Galvanized Worm Gear Clamp 4 in

Product Description

The LAMBRO INDUSTRIES 284L is a galvanized worm gear clamp sized for 4-inch duct and pipe connections. Worm gear clamps use a slotted band tightened by a screw-driven gear mechanism, delivering consistent radial clamping force around the full circumference of the fitting. The galvanized steel construction resists corrosion in humid or wet service environments. This clamp is a standard hardware item found in HVAC ductwork, dryer venting, and general plumbing and mechanical work where a secure, adjustable band connection is required. Installation requires only a screwdriver or nut driver and takes seconds per clamp. These clamps are sold as a unit and packaged in quantities of 50.

The 284L is suited for residential and light commercial applications where 4-inch round duct, flexible duct, or pipe connections need a tight, vibration-resistant seal. Common uses include connecting flexible dryer vent duct to wall collars or appliance exhaust ports, securing round HVAC duct transitions, and fastening PVC or metal pipe sleeves in plumbing rough-in work. HVAC technicians, plumbers, sheet metal contractors, and general mechanical tradespeople keep these on hand as a routine installation consumable.

Key Features

• 4-inch nominal diameter sizing for standard round duct and pipe fittings
• Galvanized steel band and housing for corrosion resistance in damp service conditions
• Worm gear mechanism provides smooth, uniform tightening around the full band circumference
• Tool-compatible drive slot accepts standard flathead screwdriver or 5/16-inch hex nut driver
• Packaged 50 units per package, suitable for stocking service vehicles and shop inventory

Compatibility

Designed as a standard worm gear band clamp for 4-inch round duct, flexible duct, and pipe connections in HVAC, dryer venting, and general mechanical applications.

Installation Notes

Installation is performed by HVAC technicians, plumbers, or sheet metal mechanics as part of ductwork or piping assembly. Slide the clamp over the duct or pipe end before seating the fitting, then position the clamp band over the joint and tighten the worm gear screw until the band is snug and evenly seated. Do not overtighten to the point of deforming the duct wall or flexible duct collar. Follow applicable local mechanical codes and manufacturer duct installation guidelines when securing dryer exhaust or HVAC duct systems.

Technical Specifications

• Nominal Diameter: 4 inches
• Material: Galvanized Steel
• Package Quantity: 50 per package
• Unit of Measure: EA
• Weight: 4.5 pounds

Standard Information

• Brand: LAMBRO INDUSTRIES
• Manufacturer Part Number: 284L