DIN 557 square nut is a four-sided nut. Compared to standard hex nuts which has six sides, din 557 square nuts has 4 sides hence their geometry provides a greater surface area to apply higher torque when tightening and also a greater surface are in contact with the part being fastened, thereby increasing the resistance to loosening (though also greater resistance to tightening). They are also much less likely to become rounded-off after repeated loosening/tightening cycles. Din 557 square nuts are typically mated with square-headed bolts.
Din 557 Square nut size basically refers to its nominal thread diameter. Typically, machine screw sizes range from about #2 to 1/2″ and regular from 1/4″ to 1 1/2″ & M6 TO M36.
Bhalla Fasteners is the leading manufacturer, supplier and exporter of din 557 square nuts India and exporting to USA ,UK ,Poland, Germany , Austrailia, Ireland, and European countries. Bhalla Fasteners is also the leading supplier of din 557 square nuts in Bulgaria and hence keep din 557 m6, din 557 m5, din 557 m10, din 557 m3, din 557 m8 in stock. Bhalla Fasteners also manufacture and export DIN 557 Nuts as per specifications (custom drawing and samples) for more information please https://www.bhallafasteners.com/contact-us
m - height of the nut
d - the nominal diameter of the thread
s - size square
mw - height