Carl Stahl Sava Industries, Cable Assemblies



Pulleys Catalog


Pulleys
(PDF 820 KB)


Product Line »
Idler Pulleys »
"MD" Nylon Pulleys

LP Series Pulleys

SAVA LP Pulleys utilize a high strength molded nylon containing finely divided particles of molybdenum disulfide (“MD”) solid lubricant.

Consider These Advantages

LP Series Pulleys

• Reduced cost
• 6-1 weight savings over steel
• Corrosion resistant
• Self lubricating
• Nongalling
• Low friction
• High tensile strength

• Abrasion-resistant properties
• Runs quietly and smoothly
• Low coefficient of
thermal expansion
• Lower H2O absorption
• Excellent impact resistance
• Less heat-generating friction
• Excellent vibration and fatigue resistance


...Also

• The improved strength of the molybdenum disulfide (“MD”)–impregnated nylon enables it to support bearing loads greater than other thermoplastic materials.
• The inherent resiliency of this material enables it to return to original dimension after deformation because of unusual extreme loading.

...And

• Bare wire rope used in conjunction with this type of LP pulleys has shown 450% improvement in the endurance life of bare wire rope when tested at 10%, and 220% improvement when tested at 20% of wire rope breaking strength.

SAVA LP pulleys can also be molded from the basic plastics listed in the chart below. “MD” nylon, we feel, has properties which offer overall advantages. However, it cannot be offered in colors as other plastics. Polyethylene and polypropylene offer significant cost advantages but with considerable loss of physical properties as indicated on the chart.

Physical Properties of Basic Plastics

Physical Properties ASTM Unit "MD" Nylon Nylon 6/6 Acetal High-Density
Polyethylene
Poly-
propylene
Tensile Strength D638 PSI 13,500 9,000-12,000 8,800-12,000 2,500-4,300 4,000-5,500
Elongation at Break D638 % 15 20-200 12-75 170-180 200-700
Shear Strength D732 PSI 10,500 9,600 7,700-9,500
Flexural Strength (Yield) D790 PSI 16,500 12,500-14,000 13,000-15,500 5,000-7,000
Hardness, Rockwell D785 R 119 110-120 119-122 50-96
Compressive Strength D695 PSI 13,000 5,000 16,000 3,500-8,000
Deflection Temperature °F
(264 PSI)
D648 °F 210 200-450 230-255 154-158 115-140