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NSK Ltd.
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Home FAQ Learning Tool
FAQ's
These are some of our most frequently asked questions. If your question is not covered, please Contact us.
Q What size are your Self-Lube® grease nipples ?
A Grease nipple size for all of the Self-Lube® range is 1/4 UNF apart from FC range which was 2BA, but in current units is M5 X 0.8 pitch.
Q What size are your stainless steel Silver-Lube® range grease nipples ?
A Grease nipple size for all of the Silver-Lube® range is 1/4 UNF, and these are stainless steel.
Q How would you stock / reference loose balls of diameters 5 mm and 5/16 inches ?
A All loose balls are referenced / stocked as metric sizes. If inch size requested, convert to metric to first 2 decimal places only. Example. 5/16 inches dia = 1 inch divided by 16 X 5 X 25.4 = 7.9375 = BALL7.93 and 5 mm dia = BALL5.00.
Q I have lost my grub screw ( set screw ) out of my bearing insert. Can you buy them, and if so what is the size / reference?
A Grub screws are referenced by dia and length e.g. M6 X 0.75 X 5 mm long. Reference = M6X5GRUBSCREW.
 
Basic Bearing Insert Series Series
1000G, 1100, 1200G, 1300
Diameter
Series
1000DECG, 1100DEC, 1200ECG, 1300EC
Diameter
  Inch Bore Metric Bore Inch Bore Metric Bore
1017
1020
1025
1030
1035
1040
1045
1050
1055
1060
1065
1070
1075
1080
1085
1090
3095
1/4UNF
1/4UNF
1/4UNF
1/4UNF
1/4UNF
5/16UNF
5/16UNF
5/16UNF
3/8UNF
3/8UNF
3/8UNF
3/8UNF
7/16UNF
7/16UNF
1/2UNF
1/2UNF
1/2UNF
M6X0.75
M6X0.75
M6X0.75
M6X0.75
M6X0.75
M8X1.00
M8X1.00
M8X1.00
M10X1.25
M10X1.25
M10X1.25
M10X1.25
M12X1.25
M12X1.25
M12X1.25
M12X1.25
M12X1.25
1/4UNF
1/4UNF
1/4UNF
5/16UNF
3/8UNF
3/8UNF
3/8UNF
3/8UNF
7/16UNF
M6X0.75
M6X0.75
M6X0.75
M8X1.00
M10X1.25
M10X1.25
M10X1.25
M10X1.25
M12X1.25
Q I have a cylindrical roller bearing that has two references on it. On the outer ring is LRJ2 and on the inner ring is LRJ1.7/8. Which one should I use?
A Different bearings often use common rings. In this case the bearing inch dimensions are 1.7/8 bore, 4 outer diameter and 13/16 wide. If you check in your catalogue you will find that these sizes correspond to LRJ1.7/8 but in both sizes they have a 4 inch outer diameter and are 13/16 wide so the outer ring is common to both. The fact that the bore is only 1 7/8 inches it could not be anything else, but it can cause confusion.
Q I have a cylindrical roller bearing that has MRJA1.3/4 on the outer ring is LRJ2 and MRJ1.3/4 on the inner ring. Which one is it?
A As in question 6, it’s a question of common rings. The difference between these bearings is the lip arrangements. MRJA1.3/4 has 2 lips on the inner ring and one lip on the outer ring. MRJ1.3/4 has two lips on the inner ring and no lips on the outer ring. On inspecting the bearing if you find 2 lips inner and 1 lip outer it is therefore MRJA1.4/3.
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