Idler Pulleys - "MD" Nylon Pulleys

Pulleys
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"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

• 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

GENERAL NOTES:
For volume customers, your name or logo can be substituted for the SAVA logo. Custom-designed pulleys can be made to your specific size requirements. Please provide a drawing showing the dimensions as outlined in the sketch. These pulleys can also be assembled with the bore inserts shown here. Pulley and cable alignment is very important in preventing premature failure and attaining long life in working or in static load conditions. Any application which has inherent pulley-cable misalignment should be thoroughly tested for the application.