White heavy duty galvanized hex bolts 316 stainless steel fasteners 55mm length. durable hex head bolt , hot dip galvanized fasteners zinc plated surface treatment. grade 8.8 galvanized hex bolts din 933 stainless steel zinc plated m3m42 size. galvanized hex nut
A head with no markings is grade 2, one with 3 lines spaced 120 degrees is grade 5, and 6 lines spaced at 60 degree intervals is grade 8. nuts are marked in several different ways—see identification marks for hex and heavy hex nuts below.
Astm a193 b7 is a bolting specification for medium-high temperature applications. it is a heat treated chromium molybdenum steel and is considered for applications up to 450° celsius (840° fahrenheit). astm a320 l7 has the same chemical and physical properties as b7, with additional charpy v notch tests taken at -101° celsius (-150° fahrenheit) for low temperature applications.
Din 603 carriage bolt a carriage bolt is also called coach bolt or round head square neck bolt or mushroom bolt. it is distinguished from other bolts by its head: the shank of the bolt is circular for most of its length, as usual, but the portion immediately beneath the head is formed into a square …
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