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Threaded Union Molded Rubber Expansion Joints

Female threaded ends make installation of these Threaded Union Molded Rubber Expansion Joints easier. Reduce noise and vibration with these expansion joints designed to absorb movement efficiently.


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Product Details

Related Products


  • Efficient noise and vibration isolation.
  • Ability to absorb large displacement due to eccentric, axial, and angular movement.
  • Applicable for both suction and discharge.
  • Female Threaded Unions allow for easy installation.


  • Vibration isolation for small pumps and circular pumps.
  • Sewage disposal purifier line.
  • Vibration isolation for air-conditioners and pipes.

Specifications: Threaded Union Molded Rubber Expansion Joints

API Part Number Size Face To Face Dimensions Allowable Motion Ratings* Compression Allowable Motion Ratings* Elongation Allowable Motion Ratings* Lateral Allowable Motion Ratings* Angular Approximate Weight
AMU0050-XX 0.5 8 0.875 0.250 0.875 45° 1.50 Lbs
AMU0075-XX 0.75 8 0.875 0.250 0.875 45° 1.80 Lbs
AMU0100-XX 1 8 0.875 0.250 0.875 45° 2.75 Lbs
AMU0125-XX 1.25 8 0.875 0.250 0.875 45° 3.50 Lbs
AMU0150-XX 1.5 8 0.875 0.250 0.875 45° 4.00 Lbs
AMU0200-XX 2 8 0.875 0.250 0.875 45° 5.00 Lbs
*Non Concurrent Ratings. Warning: Do NOT elongate rubber expansion joints when installing for suction service.  

Part Number Structure

Part Number Section Options
Type AMU = Twin Sphere Union Expansion Joint
Size XXX = Size in inches going out 2 decimal places
Body Material *Denoted with “XX” EP = EPDM NE = Neoprene

Operating Conditions

Operating Pressure up to 150 psi
Normal Operating Temp. 14°-158° F
Vacuum Rating 25″ Hg
Burst Pressure 750 psi
Warning: Pressure ratings listed in the above table are for up to 110 Degrees F (for Neoprene), and 125 Degrees F (for EPDM). For elevated temperature service, please contact API Sales for actual working pressure ratings.  


Part Part Description Material
1 Threaded Union Malleable Iron
2 Reinforcing Cloth Nylon Fabric
3 Elastomer EPDM
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