ISO 4231-2016 pdf free.Hand- and machine-operated circular screwing dies for parallel pipe threads一G series.
ISO 4231 is a supplement to ISO 2568 and ISO 4230 and specifies the dimensions of hand- and machine-operated circular screwing dies intended for production of parallel pipe threads,G series, in accordance with ISO 228-1.
The general dimensions of these dies (diameter, thickness and fixing dimensions) are in accordance with ISO 2568 so as to permit the driving of hand operated dies with the aid of the die stocks defined in that document.
The general dimensions are shown in Figure 1 and given in Table 1.
NOTE 1 The shape of the V-groove and the clearance holes are left to the manufacturer’s discretion.
NOTE 2 Tolerances:
一for precision screwing dies:
一on D: f10;on E: js12;
一 for non-precision screwing dies:
一on D and E: the tolerances are left to the manufacturer’s discretion.
Dies in accordance with this International Standard shall be marked with the letter G, immediately followed by the designation of the thread.
EXAMPLE A G series parallel thread screwing die with designation 3/8 is marked as follows: G3/8
Where tools comply in all respects with the relevant International Standards, the Symbol ISO may be appended to the mark at the discretion of the manufacturer.ISO 4231 pdf download.