here is a list of the bearings that i commonly use. what's listed first are the dimensions, followed by the boca bearings part #, then the abec rating, then the cost rounded up to the nearest dollar. tom hryniuk forwarded some interesting information on abec ratings..... ABEC ratingsThursday, January 8, 2009 6:51 PM From: "Tom Hryniuk" <[email protected]> HI Alan, here is a link explaining ABEC tolerance: http://www.mcmaster.com/library/20070314/60355KAC.pdf You will notice that on the shaft diameter difference is .0001"(one ten thousandth of an inch). For the O.D. (outside diameter) the difference is .0001" to .0002". So you are looking at a difference of .0003" total deviation. In my world, thats a lot. In a reel that is more than likely plastic molded to a tolerance of +/-.010", at best, or machined to a tolerance of +/-.005", the price difference isn't worth it. More important is the quality of bearings! Just my two cents..... metric 3 x 8 x 4 SMR693-ZZ #5 $9 3 x 10 x 4 SMR103-ZZ #5 $8 4 x 10 x 4 SMR104-ZZ #5 $8 4 x 11 x 4 SMR694-ZZ #5 $12 5 x 9 x 3 SMR95-ZZ #5 $9 5 x 11 x 3 SMR685 #1 $7 open 5 x 11 x 4 SMR115-ZZ #5 $9 6 x 10 x 3 SMR106-ZZ $7 6 x 12 x 4 SMR126-ZZ #5 $9 6 x 19 x 6 SMR626-ZZ $12 avet 7 x 14 x 3.5 SMR147 #1 $11.45 7 x 14 x 5 SMR697-ZZ #5 $12 7 x 19 x 6 SMR607 #1 $12 or SMR607-ZZ #3 $14 or SMR607-ZZ #5 $18 7 x 22 x 7 SMR627-ZZ #1 $12 8 x 12 x 3.5 SMR128-ZZ #5 $9 8 x 14 x 4 SMR148-ZZ #5 $9 8 x 16 x 5 SMR688-ZZ #5 $9 avet 8 x 19 x 6 SMR698-ZZ #1 $11 or SMR698-ZZ #5 $18 9 x 17 x 5 SMR689-ZZ #5 $12 9 x 20 x 6 SMR699-ZZ #3 $13 or SMR699-ZZ #5 $18 10 x 22 x 6 SMR6900-ZZ #1 $17 or SMR6900-ZZ #5 $28 10 x 26 x 8 SMR6000-ZZ #1 $20 12 x 21 x 5 SMR6801-ZZ #3 $22 avet inch 0.125 x 0.375 x 0.156 SR2-ZZ #3 $7 0.125 x 0.500 x 0.172 SR2A-ZZ #1 $7 0.1875 x 0.3125 x 0.125 SR156-ZZ #7 $8 avet 0.1875 x 0.375 x 0.125 SR166-ZZ #7 $8 0.1875 x 0.500 x 0.196 SR3-ZZ #1 $6.25 or SR3-ZZ #3 $7.25 or SR3-ZZ #7 $10 0.1875 x 0.6875 x 0.250 call avet 0.250 x 0.625 x 0.196 SR4-ZZ #3 $8 0.312 x 0.500 x 0.1562 SR1810-ZZ #1 $8 SR1810-ZZ #3 $9 SR1810-ZZ #7 $12.50 avet 0.375 x 0.625 x 0.1562 SR1038-ZZ #3 $11 avet 0.375 x 0.875 x 0.2188 SR6 #1 open $10 SR6-ZZ #3 $12 0.375 x 0.875 x 0.2812 SR6-ZZ #1 open $11 SR6-ZZ #3 $12 SR6-ZZ #7 $16 avet 0.500 x 0.875 x 0.2812 SR6-5ZZ #1 $16 or SR6-5ZZ #3 $17 0.500 x 0.875 x 0.3125 0.500 x 1.125 x 0.3125 SR8-ZZ #1 $20