Metric double-ended studs, defined in the DIN 939 standard published by the German Institute for Standardization (DIN), are headless machine screw fasteners and may or may not be fully threaded depending on the length of the fastener. Depending on the application, either end can accept a nut, or one end can be threaded into a predrilled hole, leaving the other end usable to attach a matched component secured with a nut.
.jpg "DIN 939 Double Ended Studs (1.25xD)")
Stud assemblies offer several advantages over bolts. Firstly, they eliminate the need for perfect squareness in an assembly by allowing a nut to float and adjust on the threads of the nut end. Additionally, studs can act as pilots to facilitate the assembly and disassembly of mating parts.
In general, double-ended studs are manufactured from marine grade stainless steel, in diameters ranging from M5 to M30 and in lengths up to 120 mm.
The requirements in the DIN 939 standard are under the following headings:
Double-ended studs are threaded fasteners that have a thread on each end and a non-threaded part between the two threaded ends. Double-ended studs are designed for use where one threaded end is inserted into a threaded hole and a hex nut is used at the other end to clamp a fixture to the surface where the stud is threaded. Double-ended studs have different thread lengths at each end. It has a short thread intended for use in a threaded hole. For metric double-ended studs, the thread of the guide tip is not included in the nominal length of the stud. These studs have a guide tip equal to 1,25 times the stud diameter. In addition, these studs are manufactured in feature classes 5.8 and 8.8, stainless steel and brass.
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