BS EN ISO 04231:2016 pdf download – Hand- and machine-operated circular screwing dies for parallel pipe threads — G series (ISO 4231:2016)
1 Scope
This International Standard 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.
2 Dimensions
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:
— for precision screwing dies:
— on D: f10;
— on E: js12;
— for non-precision screwing dies:
— on D and E: the tolerances are left to the manufacturer’s discretion.
3 Marking
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:
G 3/8
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.BS EN ISO 04231 pdf download