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Technical Information Thread Limits
Metric Taps; Comparison Tap Limits & Product Classes and Grades
Tap Size
Pitch
Tap Limits
ISO 6H JIS 2
Tolerance Upper Deviation Old/JIS Product
Class Tolerance Tolerance
um um
mm
ISO
Tap Grade
Recommended Limit
Tap Limits P 1 P 2 P 3 P 4
Microns um um um um um
M1.0 x 0.25 5H 56 60 ISO 1 + 6 / 17 + 10 / 25
M1.1 x 0.25 5H 56 60 ISO 1 + 6 / 17 + 10 / 25
M1.2 x 0.25 5H 56 60 ISO 1 + 6 / 17 + 10 / 25 M1.4 x 0.3 5H 60 60 ISO 1 + 6 / 18 + 10 / 25 M1.6 x 0.35 5H 67 85 ISO 1 + 7 / 20 + 10 / 25 + 25 /40
M1.7 x 0.35 6H 85 85 ISO 2 + 20 / 34 + 10 / 25 + 25 /40
M1.8 x 0.35 6H 85 85 ISO 2 + 20 / 34 + 10 / 25 + 25 /40
M2.0 x 0.4 6H 90 70 ISO 2 + 21 / 36 + 10 / 25 + 25 /40
M2.2 x 0.45 6H 95 95 ISO 2 + 23 / 38 + 10 / 25 + 25 /40
M2.3 x 0.4 6H 90 95 ISO 2 + 21 / 36 + 10 / 25 + 25 /40
M2.5 x 0.45 6H 95 95 ISO 2 + 23 / 38 + 10 / 25 + 25 /40
M2.6 x 0.45 6H 95 95 ISO 2 + 23 / 38 + 10 / 25 + 25 /40
M3.0 x 0.5 6H 100 100 ISO 2 + 24 / 40 + 10 / 25 + 25 /40 M3.5 x 0.6 6H 112 90 ISO 2 + 27 / 45 + 10 / 25 + 25 /40 M4.0 x 0.7 6H 118 118 ISO 2 + 29 / 48 + 20 /40 M5 x 0.8 6H 125 125 ISO 2 + 30 / 50 + 20 /40 M6 x 1.0 6H 150 120 ISO 2 + 35 / 59 + 20 /40 M7 x 1.0 6H 150 120 ISO 2 + 35 / 59 + 20 /40 M8 x 1.25 6H 160 130 ISO 2 + 38 / 63 + 20 /40 + 40 / 60
M10 x 1.5 6H 180 140 ISO 2 + 42 / 70 + 20 /40 + 40 / 60
M12 x 1.75 6H 200 160 ISO 2 + 48 / 80 + 40 / 60 + 60 / 80
M14 x 2.0 6H 212 170 ISO 2 + 51 / 85 + 40 / 60 + 60 / 80
M16 x 2.0 6H 212 170 ISO 2 + 51/ 85 + 40 / 60 + 60 / 80
M18 x 2.5 6H 224 190 ISO 2 + 54 / 90 + 40 / 60 + 60 / 80
M20 x 2.5 6H 224 190 ISO 2 + 54 / 90 + 40 / 60 + 60 / 80
M22 x 2.5 6H 224 190 ISO 2 + 54 / 90 + 40 / 60 + 60 / 80
M24 x 3.0 6H 265 200 ISO 2 + 64 / 106 + 40 / 60 + 60 / 80
P limits; they stock the smaller P limit for SP Taps, and the larger P limit for PO taps.
Where there is only the one “P” limit; it is the same limit for both SP & PO Taps
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Product Tolerance
473