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Hi Tim, They make V-belts in standard sizes;
3L series= 3/8" wide
4L series= 1/2" wide
A Section= 1/2" wide x 5/16"thick
B Section or 5L Series = 21/32" x 11/32" thick Belt length:
3L300 is 30" long
4L310 is 31" long A section belts are 2" longer than the belt number, A30= 32" long, A42= 44" long B section belts are 3" longer than the belt number, B30= 33", B45= 48" long but once you get to B35 then the 5L series starts with the common numbering scheme, 5L380= 38" long belt, however the B Section numbering system remains as stated. 3L and 4L Series belts are rated for fractional HP applications. A & B Section and 5L Series belts are rated for industrial use or in larger HP applications. A Section belts can be used for 4L belt applications but 4L Series can NOT be used for A Section belt applications as A Section belts are a heavier rated belt. Cogged V-belts are used for better belt grip and cooler running. In some applications, like centrifigal fans, cogged belts can quiten system fan noise or will not viberate as much after sitting for a long time with small diameter sheaves. Belt color schemes can only be used with-in the same mfg of the belts. As far as I know, belt color schemes have not been used in a very long time and wortless info between different belt mfg's. To fit a "new" V-belt to a pulley, the top belt width should be "at" or just slightly above the outer pulley diameter on a fixed diameter pulley. If the "new" belt is below the diameter surface then the pulley needs replaced as it's worn out. A shredded V-belt is caused by bad pulley alignment and or burrs/grooves on the pitch surface of the pulley(s) or contact with a external non-rotating part. If you had used a 4L Series belt on A-Section application then the belt would have not lasted very long but by no means schredded, so I would be looking for a cause other than wrong belt application. Auto part stores are a good source for A-Section V-belts. T_Bone
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