Hi Terry
I presume from the header you need new guide bearings.
All Taiwanese and Chinese manufactured saws have metric bearing sizes even if they have UNC threads on their (metric headed) bolts. Some early American made saws had special bearings with a flange on the outer race instead of a rear guide-roller and some had cam-follower bearings, these may have been inch sizes.
The following metric size deep groove ball bearings have been used:
Inside Diameter
(mm)
|
Outside
Diameter
(mm)
|
Width
(mm)
|
?±õ²Ô³Ù¡¯±ô.
Bearing code
|
Preferred
Radial Internal Clearance grade
|
Comment
|
5
|
16
|
5
|
625
|
MC3
|
as rear guide-roller
|
8
|
22
|
7
|
608
|
MC3
|
as rear guide-roller
|
9
|
26
|
8
|
629
|
MC3
|
as rear & side guide-rollers
|
10
|
26
|
8
|
6000
|
CM or Normal
|
as side guides on later saws
|
10
|
30
|
9
|
6200
|
CM or Normal
|
most popular, esp up to y2000 from Taiwan
|
12
|
32
|
10
|
6201
|
CM or Normal
|
only some older saws
|
?These bearings are used at v.low speed and low load, so the ABEC rating is not applicable, however the Radial Internal Clearance grading should be considered.
Just measure the bearings ID, OD and Width and pick out the ones you need - jv