Click here to access Lovejoy's Digital Parts Catalog for SS Type components.
A full SS Type coupling is comprised of 3 parts: 2 stainless steel hubs (with set screw) & 1 elastomeric spider (SOX, Urethane, Hytrel®, or Bronze).
SOX (NBR) Torque
SOX (NBR) Rubber (Standard Insert) - Nitrile Butadiene (Buna N) Rubber is a flexible elastomer material that is oil resistant, resembles natural rubber in resilience and elasticity.
Urethane - 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.
Hytrel® - Flexible elastomer designed for high torque and high temperature operations. Excellent resistance to oil and chemicals. Not recommended for cyclic or start/stop applications.
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.
SOX (NBR) Rubber
-40°F to 212°F (-40°C to 100°C)
-30°F to 160°F (-34°C to 71°C)
55D or 90-95A*
-60°F to 250°F (-51°C to 121°C)
-40°F to 450°F (-40°C to 232°C)
* Sizes SS075 to SS110 shore hardness = 55D, Size SS150 shore hardness = 90-95A
Note: In addition to solid center spiders (most common), open center spiders are also available (to allow shafts of the
driver and driven to be positioned within a short distance). Open center spiders
offer shaft positioning flexibility but have a lower RPM capacity (1,750 RPM
maximum for NBR, 3,600 maximum for Urethane and Hytrel®).
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