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2.8SMR-4-500 – 3" Deflection Spring Isolator/ Restrainer

SMR-4-500 series are heavy-duty 3" deflection seismic restrained spring mounts designed to withstand lateral loads in combination with vertical loads. 


Recommended load range: from 50% of maximum load to maximum load of spring isolator listed in the table below.

There are two available configurations:

  • SMRF: flat top with an inside leveling adjustment feature. 
  • SMRT: bolted top with leveling adjustment feature. 


Recommended for vibration isolation of:

HVAC equipment, fan air circulation systems, compressors, pumps, chillers, AC units, cooling towers, inertia bases, etc.

All springs at rated loads have 50% additional travel to solid load.
All mounts' elements are safe at solid load.
Safety Factor - springs will accommodate 50% extra load from rated load to solid load.
Recommended load range: from 50% of maximum load to maximum load.
Springs are powder coated providing good corrosion resistance.
Rugged welded steel housing designed to withstand seismic and high wind forces.
Springs are color coded for easy field identification.
Elastomer base & top cups provide better vibration isolation, load distribution, and noise reduction.
Hot-dip galvanized housing provides excellent corrosion resistance.
Anti-skid rubber acoustical pad.

Go here for Seismic Restrained Isolators 1 & 2" deflections:

Related Products
Please contact us for larger volume orders as further discounts may apply.
ModelRated Load (lbs)Deflection at Rated Load (in)Spring Rate (lbs/in)Max. Vertical/Horizontal G RatingSpring ColourShipping Weight (lbs)PriceTypeQuantityTotal
SMR-4-5008003266.7Black130 - - - Inquire
SMR-4-5011,6003533.3Blue130 - - - Inquire
SMR-4-5022,4003800Yellow130 - - - Inquire
SMR-4-5033,20031,066.7Orange130 - - - Inquire
SMR-4-5044,00031,333.3Red130 - - - Inquire
SMR-4-5054,80031,600White130 - - - Inquire
SMR-4-5066,00032,000Brown130 - - - Inquire
SMR-4-5078,00032,666.7Green130 - - - Inquire
SMR-4-506-85310,00033,333.3Brown/Grey138 - - - Inquire
SMR-4-50912,00034,000Grey130 - - - Inquire
SMR-4-509-85316,00035,333.3Grey/Grey138 - - - Inquire
Note: When product price is not shown, please call our office for technical consultation prior to place an order


a) Rated load is the maximum load recommended.

b) 500 Spring: 4.4” Outside diameter x 8.5” Free Length.

c) 853 Spring: 3” Outside diameter x 8.5” Free Length.

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