Flexible Jaw Couplings - Spiders

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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





L Type sizes rage from L035 to L276

AL Type see L Type or the AL section for AL150

C Type require one cushion set and one collar with hardware




For Standard Couplings see L

For Aluminum Couplings see AL

For Larger Max Bore or Higher Torques see C type couplings





LDI - Corporate  Click for map LDI   Click for map
Precision Machining & Assembly Fabrication & Assembly
1864 Nagle Ave. 12901 Jim Dhamer Dr.
Manitowoc, WI  54220 Huntley, IL  60142
PH: 920.682.6877                         
FAX: 920.684.7210                         



Our talented team of degreed and professionally certified Engineers, Quality Assurance, Production and Customer Service staff have many years of experience in the industry.  Their attention to detail and ability to collaborate with our clients to solve their problems is reflected in the 50+ years we have been in business.


Customer Service: 

920.682.6877, option 4

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