SPA (13) pre-drilled disc
Description
The basic drilled pulley with a centering hole in the middle, possibly a centering marking. Each disc can be drilled and customized within the range specified by the manufacturer (in field Size3). The disadvantage is that it requires machining, i.e. we will need cutting to make the hole and latch track. In the Size3 field, we indicated the hole range to which the pulley can be safely drilled, according to the manufacturer. Suitable for all straps with a profile width of ~13mm.
(A, SPA, XPA, 4L as well, but for lawn mowers we recommend using the disc The dials are numbered: SPA nominal diameter / number of tracks and an E indicating that the disc is pre-drilled... The maximum diameter (Do) of pulleys marked SPA shall be at least 5,5 mm larger than the nominal diameter (measured at the location of the force carrier). SPA discs shall have a minimum track depth of at least 11 mm calculated from the nominal diameter (Dp) measured at the location of the support fibre.