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Myford Speed 10 Headstock Bearings Question

What's the difference?

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"Bill Hancox"	29/01/2014 19:53:25
257 forum posts 77 photos	Can anyone tell me the difference(s) between a 30205 bearing, a 30205A bearing and a 30205J bearing? I have not been able to get an adequate answer for this either from local suppliers or on line. I have removed 30205J and 30206J bearings from my lathe yet the manual specifies 30205A and 30206A bearings. Hmmmm. Methinks I need a 1/2+1/2.
"Bill Hancox"	30/01/2014 02:15:36
257 forum posts 77 photos	This is an example of the info that I found online: A: SPECIAL INTERNAL DESIGN OR MANUFACTURING CODE. J: RADIAL INTERNAL CLEARANCE AND MANUFACTURING PRECISION. THE FIRST DIGIT DENOTES THE ISO RADIAL INTERNAL CLEARANCE CATEGORY.THE SECOND DIGIT DENOTES THE ISO PRECISION CLASS, E.G. : J36: RADIAL INTERNAL CLEARANCE CATEGORY 3, ISO PRECISION CLASS 6 (ABEC 3). EQUIVALENTS: J20 = C2, J30 = C3, J40 = C4 AND J50 = C5. I will try a query to SNR
blowlamp	30/01/2014 09:06:55
1885 forum posts 111 photos	See here LINK I'd just fit some good quality off the shelf bearings for this application. Martin.
Michael Gilligan	30/01/2014 09:21:05
23121 forum posts 1360 photos	Explanatory text on page 2 of this ... Mercifully brief. MichaelG.
"Bill Hancox"	30/01/2014 13:49:10
257 forum posts 77 photos	A good quality generic bearing seems to be the predominate advice. myford.co.uk sells the bearings. I noted that the part numbers depicted in their photos have the suffix "A" so I will probably order those.

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