Flexible Jaw Couplings - Spiders

Four types of elastomer designs and materials are offered to allow for flexibility in addressing specific application requirements. 

Standard Materials:

• NBR (Nitrile Butadiene Rubber) -- Buna N (Black)
  • Considered the standard and most economical for jaw coupling spiders
  • Offers the best combination of temperature and chemical resistance, misalignment, and dampening ability
  • Only material suitable for reciprocating engine applications
  • 80A Shore Hardness except  L035=60A
  • Temperature Range - 40° F to 212° F (-40° C to 100° C)
  • Resembles natural rubber in resilience and elasticity

• Urethane (Blue)
  • Greater torque capability than NBR (1.5 times), provides less dampening effect and operates in a smaller temperature range
  • Good resistance to oil and chemicals
  • Not recommended for cyclic or start/stop applications
  • L050 to L110 Shore Hardness 55D, L150 to L225 Shore Hardness 90-95A
  • Temperature Range -30° F to 160° F (-34° C to 71° C)

• Hytrel (Tan)
  • Flexible elastomer designed for high torque and high temperature operations
  • Excellent resistance to oil and chemicals
  • Not recommended for cyclic or start/stop applications
  • 55D Shore Hardness
  • Temperature Range -60° F to 250° F (-51° C to 121° C)

• Bronze
  • Rigid, porous oil-impregnated metal insert exclusively for low speed (max 250 RPM) applications requiring high torque capabilities
  • Not affected by extreme temperatures, water, oil, or dirt
  • Temperature Range -40° F to 450° F (-40° C to 232° C)

Standard Styles:

• Solid Center
  • Commonly used when shafts of the driver and driven equipment can be kept separate by a standard gap
• Open Center
  • Allows for the shafts of the driver and driven to be positioned within a short distance
  • Offer shaft positioning flexibility but have a lower RPM capacity (1,750 RPM Max for NBR, 3,600 Max for Urethane/Hytrel)
• Snap Wrap Flexible
  • Design allows for easy removal of the spider without moving the hubs
  • Allows for close shaft separation all the way up to the hubs maximum bore
  • Maximum RPM is 1,750 RPM with the retaining ring, but if used with the LC Type (with collar) the normal RPM rating of the coupling applies
  • Style is available in NBR and Urethane only, and in limited sizes
• Cushions
  • Used exclusively for the C Type couplings
  • Load cushions are held in place radially by a steel collar which is attached to one of the hubs