HRSA-PR Series Pre-compressed Spring & Elastomeric Angularity Hangers are designed to isolate low and high frequency vibrations in suspended piping and equipment - preventing transmission of vibration to the building structure through the piping systems. The products incorporate a color-coded steel spring for ease of identification in the field. Load ranges from 21 - 8,200 lbs. and up to deflections of 3". Custom sizes and deflections up to 5" available upon request.

VMC Group HRSA-PR Pre-compressed Spring & Elastomeric Angularity Hangers combine both a pre-compressed feature along with 30° of angularity for misalignment of hanger rods. The pre-compressed designs are pre-compressed to the rated deflection so as to support the suspended equipment or piping at a fixed elevation during installation regardless of load changes. The  angularity hangers have a 30° misalignment capability, spring diameters and hanger box lower hole sizes are sufficiently sized to permit the hanger rod to swing approximately 30° before contacting the box.

The HRSA-PR Pre-compressed Series also offers the capability to incorporate eyebolt hardware to accommodate duct strap connections and/or pencil rods, when isolating ductwork and suspended ceilings.

Features & Benefits

  • Loads from 21 - 8,200 lbs. with static deflections up to 3” provide flexibility over a wide range of applications
  • Pre-compressed hangers offer quick and easy installation in even the most challenging locations
  • Lower hanger rod enables a 30⁰ swing to compensate for rod misalignment and prevents short circuits to the hanger box
  • Color-coded springs provide easy identification of spring hangers for installation and inspection
  • Combined elastomeric and spring for both low and high frequency isolation in one hanger box


  • Suspended piping
  • Suspended electrical services
  • Suspended equipment
  • Suspended ductwork




The engineers we employ hold the highest industry-recognized credentials in structural analysis, elastomer development and system dynamics.


We are the first ISO accredited PCA ISO-17065, third-party certification body for special seismic certification of non-structural building components and their mounting configurations by the ICC’s International Accreditation Service.

Test & Measurement

We are the only ISO 17025:2005 Accredited Seismic Simulation Test Laboratory with a triaxial shake table owned and operated by California licensed Structural engineers.

Testing Services Update
DCL now offers Nuclear Qualification and Testing services.

In partnership with Greenberry Industrial, we now offer testing services that meet the requirements of ASME NQA-1.

Call for more information.