Arms and Extensions Eco Electrical Systems > Arms and Extensions What’s the difference between the four arms and extensions? Arms and Extensions Specs 32 inch arm-no tab 32 inch arm no tab. This is our standard arm. Part # 1B NO TAB Product PDF Virtual 3D Model 32 inch arm with tab MF Flange is attached to insulator cover and the tabbed arm is captured inside the MF Flange to prevent the arm from backing off. Tab snaps into the MF Flange when installed. Part #1T Product PDF Virtual 3D Model Wide Arm The wide arm profile interfaces with all hinged type designs short and long hinges. The hinge length is dependent on the insulator cover design. Product PDF Virtual 3D Model Narrow Arm The narrow arm profile interfaces with all hinged type designs short and long hinges. The hinge length is dependent on the insulator cover design. Product PDF Virtual 3D Model HSW Arm The HSW (Hinge, Short, Wide) is a hinged arm with a short hinge and a wide or standard profile arm. The hinge mechanism is a double hinge. It allows the arm to position to the conductor. It allows for downstrain applications, it is very versatile.This is a two piece assembly. The hinge and the arm adapter are attached to the insulator cover in the factory. The arm is then installed after the insulator cover is installed and pinned. There are two different types of hinges, short and long and they are dependent upon the insulator cover design. Product PDF HLW Arm The HLW (Hinge, Long, Wide) is a hinged arm with a long hinge and a wide or standard profile arm. The hinge mechanism is a double hinge. It allows the arm to position to the conductor. It allows for downstrain applications, it is very versatile. This is a two piece assembly. The hinge and the arm adapter are attached to the insulator cover in the factory. The arm is then installed after the insulator cover is installed and pinned. There are two different types of hinges, short and long and they are dependent upon the insulator cover design. Product PDF ©2021 ECO Electrical Systems