This Mason C-A-45 floor mount vibration isolator is designed primarily to support light concrete or wooden floors to reduce noise and vibration. A neoprene friction pad on the base provides a non-skid surface, and the ductile cast iron housing provides impact and fatigue resistance. The mount secures a heavy duty steel spring for absorbing shock and supporting the load, with neoprene sponge inserts to limit movement and prevent contact between upper and lower castings of the mount for increased efficiency of the spring. The base has four bolt holes for rigid mounting when used to support machinery. This vibration isolator is suitable for use with light concrete or wooden floors or with small pumps, motors, compressors, or air handling equipment.SpecificationsSpring constant28 lbs/in / .357 kg/mmMaximum load capacity45 lb./20.4 kgDeflection1.6 inch/41 mmAdditional travel to solid50% of deflectionAdjustment bolt3/8 x 4 inches/ 102 mm, externalFree and operating height4-1/2 inches/114.3 mmDimensions*4-1/2 x 2-1/8 x 5-3/4 inches/114 x 54 x 146 mm (H x W x D)*H is height, the vertical distance from the lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to backShock and vibration control products (absorbers, mounts, and pads) reduce air and structure-borne dissonance by either blocking or absorbing sound waves, or damping or isolating vibrations that cause them.  Shock absorbers, vibration damping mounts, and vibration damping pads can extend equipment life and help protect work environments, and they are most commonly used in heating, ventilation, and air conditioning (HVAC) systems or in other large machinery operations. Weight distribution determines the number of mounts or pads needed. If evenly distributed, the maximum load capacity per mount or pad should equal the total weight of the machine divided by the number of mounting points available.Mason Industries manufactures noise reduction, vibration isolation, and seismic restraint control products such as mountings, hangers, and flexible connectors for mechanical equipment. The company, founded in 1958, is headquartered in Hauppauge, NY.