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   Engineering Drawings: SP-3

SP- 3 Static Pivot Tensioner

The smallest York Size 3 tensioner packs a punch equal to the strongest Size 3 offered. All in about one square inch of space, making this tensioner ideal for constrained areas. Tensioner works equally well inside or outside of the belt.

Operating Characteristics
Range of adjustment - .73 inches (18.5 mm) over a 44º arc
Maximum force against belt - 8 pounds (3.6 kg) continuous, 10 pounds (4.5 kg) peak

* Mounting Data:
     Approximate footprint without pulley of .70 inches (17.8mm) wide by 1.36 inches (34.5 mm) long
     Minimum clearance from mounting surface to bottom of pulley is .18 inches (4.6 mm) for self       lubricating pulley or ball bearings. Plastic sleeve bearings require .21 inches (5.3 mm) minimum       clearance.
     Requires one #6-32 threaded hole and one .125 clearance hole. See drawing below.

If needed, mounting spacers are available from York for higher than standard belt clearances. See www.york-ind.com/spacers or contact York for details.
** Tensioner Height:
To determine tensioner maximum height, add total end to end pulley width desired + pulley clearance from mountingsurface desired = X

     If X is less than or equal to .637 (16.2 mm), tensioner height is 0.652 (16.6 mm)
     If X is greater than .637 (16.2 mm), consult York Engineering for available optional shafts and       mounting bases.

York tensioners are designed to mount securely onto a flat surface with just a single screw. The tensioners allow minimal clearance between the belt and mounting surface. Tensioners also feature different shaft lengths so they are also adjustable by York to provide greater clearance heights if needed. The York website's Tensioner Configuration Tools automatically account for shaft changes, if needed, when they create the specific tensioner part number for your application. Where even greater belt clearances are needed, York can provide machined, anodized spacers to act as a raised tensioner mounting base. Spacers are available in custom thicknesses while standard catalog spacers .38 inches thick (9.7mm) for Size 4 and .25 inches (6.4mm) for Size 3 tensioners are always in stock at York. Spacers are shown below and fit within the same footprint as the tensioners themselves. The spacer part numbering system uses the last two digits of the part number to indicate the thickness in decimal inches, with a tolerance of +/- .01.