Direct-Mount Chain Models

Regardless of space constraints, elevations, the distance between points and directional flows H & N Supplies can engineer a Roto Hammer® valve operation system that will work for you. No company can afford downtime, and with our Custom Solutions for valves, you’ll be back up and running sooner.

Item No. Hand Wheel Diameter
EXT-CMAD-6 152 mm (6”)
EXT-CMAD-9 229 mm (9”)
EXT-CMAD-12 305 mm (12”)
EXT-CMAD-15 381 mm (15”)
EXT-CMAD-18 457 mm (18”)
EXT-CMAD-24 610 mm (24”)
EXT-CMAD-30 762 mm (30”)
EXT-CMAD-36 914 mm (36”)

Hand Wheel Replacement Data Sheet PDF – View | Download

When ordering Direct-Mount Chain Model valve extensions, the following information is required:

1. Valve size and type
2. Diameter of existing hand wheel
3. Length of extension required
4. Chain length required
5. Fill out Hand Wheel Replacement Data Sheet

If extension will be in horizontal position and longer than 914mm (3’), we recommend the purchase of an Extension Rod Support Bearing for additional support.


Provisions must be made to prevent the HANDWHEEL RETAINING NUT FROM BACKING OFF whenever a chain wheel is installed. To insure safe operations, H & N Supplies Ltd recommends that thorough inspection of all chain operated valves be performed as a routine part of the user’s Safety/Maintenance Schedule. Set screws and other threaded fasteners MUST be secure and tight.

In addition, it is strongly recommended that an appropriately sized Roto Hammer RCK Safety Cable Kit (optional) be installed on every overhead chain wheel operated valve.