COUPLINGS - Rainbow Precision Products, Inc.

STARFLEX COUPLINGSIMPORTANT REMINDERSelecting the proper insert material is just as important asselecting the correct type and size of jaw coupling because of therole they play in the performance and maintenance of the product.ELEMENT CHARACTERISTICSPropertiesNBR (Rubber) Nitrile Butadiene Rubberis an elastomeric element that is oilresistant with the resilience andelasticity of natural rubber.Most economical and widely-usedelement.Urethane -- Urethane has 1.5 moretorque capability than NBR, providesless dampening effect and has goodresistance to oil and chemicals.Not recommended for cyclic orstart-stop applications.Hytrel -- Hytrel is a pliant elastomersuited to high torque / temperatureoperations. Notable resistance to oil andchemincalsNot recommended for cyclic orstart-stop applications.Bronze -- Bronze is a metal insertdesigned exclusively for slow speed)operations that require high torque.(Maximum 250 RPM)Resistant to extreme environments(temperature, water, oil, dirt).TemperatureRange-40° to +212° F-40° to +100°C-30° to +160° F-34° to +71° C-60° to +250° F-51° to 121° C-40° to +450° F-40° to +232°CJaw Couplings AdvantagesJaw design is considered “fail-safe” - if theinsert element wears/breaks away, thecoupling continues to operate until insert canbe conveniently replaced.MisalignmentAngular ParallelDegree InchShoreHardnessDampeningCapacity1° .015 80A HIGH GOOD1° .01555DL050-L11090-95AL150-L225LOWChemicalResistance ColourVERY GOOD1/2° .015 55D LOW EXCELLENT1/2° .010 -- NIL EXCELLENTBLACKORANGEBEIGEGOLDMaintenance TipsThrough manual inspection, avoid allowing thejaw tips to come into contact; a noisy, grindingoperation will result. Do not hesitate to replacethe insert if signs of wear are evident.COUPLINGSSimple design means easy installation, removaland visual inspection. Also offers lighter weightand lower cost vs. torque capacity.Insert ChoiceThe choice of the insert element can make asignificant difference in the couplings’sperformance with regards to vibration,temperature, chemicals, misalignment, high rpm,space limitations and installation/removal.Do not over-estimate service factors whenchoosing the coupling / insert. This increasescosts unnecessarily and can cause damageelsewhere in the drive. Due to the variety ofinserts available, careful selection will result inefficient, long-lasting operations.132BE SURE TO SPECIFY