MARYLAND METRICS
THREAD DATA CHARTS

METRIC THREAD
BS 4827 ISO metric screw threads
miniature series 'S'

BS4827

Nominal size  Dimensions in mm
1st choice 2nd choice Pitch of thread P Major diameter Pitch (effective) diameter Minor diameter
S-0.3   0.08 0.300 000 0.248 038 0.223 200
  S-0.35 0.09 0.350 000 0.291 543 0.263 600
S-0.4   0.1 0.400 000 0.335 048 0.304 000
  S-0.45 0.1 0.450 000 0.385 048 0.354 000
S-0.5   0.125 0.500 000 0.418 810 0.380 000
  S-0.55 0.125 0.550 000 0.468 810 0.430 000
S-0.6   0.15 0.600 000 0.502 572 0.456 000
  S-0.7 0.175 0.700 000 0.586 334 0.532 000
S-0.8   0.2 0.800 000 0.670 096 0.608 000
  S-0.9 0.225 0.900 000 0.753 858 0.684 000
S-1   0.25 1.000 000 0.837 620 0.760 000
  S-1.1 0.25 1.100 000 0.937 620 0.860 000
S-1.2   0.25 1.200 000 1.037 620 0.960 000
  S-1.4 0.3 1.400 000 1.205 144 1.112 000
For full range and further information see BS 4827.
Example Designation: for a thread diameter 0.5 mm by length 2.0 mm = S 0.5x2

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