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VALVE REBUILDING TOOL & DIE MACHINING FLATTENING & SMOOTHING LAPPING ENGINE VALVES
 
 Grade & Grit Selector Guide

GRADE
GRIT
  
Average particle Size of Abrasive Grains
1/1000 inches Microns (0.001 mm)
7A
1200
 EXTREMELY FINE Polishing.
 High Precision Lapping
 
0.12
3
6A
1000
0.20
5
5A
800
0.38
9
4A
600
 VERY FINE For Fine Polishing and Lapping
 
 
0.56
14
3A
500
0.68
17
2A
400
0.90
23
1A
320
 FINE For Finishing Valve Lapping, Bearings,
 Dies and Gauges
1.28
33
A
280
1.75
44
B
240
 MEDIUM FINE For Cylinder Lapping
 
2.48
63
C
220
2.6
66
D
180
 MEDIUM General Purpose for
 Controlled Metal Removal
3.4
86
NC
150
4.8
122
E
120
 COARSE For the inital "Cut"
 Fast Removal of Metal
5.6
142
F
100
6.8
173
G
80
15.
267
J
50
 VERY COARSE For Fastest Metal Removal
18.
463
K
36
28.
710

STOCKIST- PATTANASIN MACHINERY CO., LTD. Tel : 02-225-5449
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