Description
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
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