Stainless steel fasteners to bs en iso 3506

The carbon level of grade A4 is allowed to be up to 0. This grade similar to a 1. Table 2 shows the 0. Notes The mechanical property limits are minima. Property class 50 represents the steel in the annealed condition. Property class 80 is based on severely hard cold drawn bar. All tensile stress values are calculated and reported in terms of the nominal tensile stress area of the thread. The elongation measurement is determined on the actual bolt or screw length and not on a prepared test piece.

The chemical compositions of the various fastener grades are shown in Table 1. The approximate equivalent grades in other systems are shown for reference. The composition ranges are much wider in this standard than in the standards for the feedstock product, usually bar.

Table 2 shows the 0. Table 2 Mechanical properties for austenitic stainless steel bolts, screws and studs. This latest revision has removed the restrictions on the size of fastener M24 for which the properties in table 2 can be guaranteed.

However, there is a general clause which says that the standard is only applicable up to 39 mm diameter. Above that, the standard can still be used provided all parties agree that the properties can be achieved. The effect of these changes is to increase the maximum diameter on which the class 70 and 80 properties can be specified without discussion from 24 to 39 mm.

This reflects the conservative nature of the previous 24 mm limit. Indeed, class 70 and 80 properties are available above 39 mm but this must always be discussed with the supplier. Property class condition, i.