There are many testing methods for bolts and screws. Generally, hardness, tensile strength and torsional strength should be tested. The required equipment include: Rockwell hardness tester, Brinell hardness tester, bolt and nut tensile testing machine, bolt tension and torsion testing machine, ductility testing machine, torque strength testing machine, tappi...

Pressure riveting nut, also known as self fastening nut, is a kind of nut applied to thin plate or sheet metal. It is round in shape and has embossed teeth and guide groove at one end< br />Rivet nuts are divided into S series, CLS series and SP series. It provides a simple method to install the internal thread to the precision metal plate products, which pl...

The first advantage is the strong ability of wear resistance and shear resistance: the 30 degree inclined plane of the thread bottom of the nut can make the locking force of the nut evenly distributed on the threads of all the teeth. Because the pressing force on the thread surface of all the teeth is evenly distributed, the nut can better solve the problems...

Fasteners in the market are mainly made of carbon steel, stainless steel and copper

The fastener standard specifies two kinds of marks on the bolt head. The manufacturer's mark is a symbol identifying the manufacturer (or importer). The organization is responsible for ensuring that fasteners meet specified requirements. The grade mark is a standard mark used to identify the material characteristics that fasteners conform to.

Usually, it doesn't matter whether the bolt head or nut has been tightened or not. This assumes that the diameter of the bolt head and nut face is the same. If not, it's important< br />For example, suppose the nut is flanged and the bolt head is not. If the tightening torque is determined on the assumption that the nut is to be tightened, but then the bolt ...

Torque yield is a method of tightening fasteners to achieve high preload by tightening the yield point of fastener material. To do this consistently, special equipment is required to monitor the tightening process. Basically, after tightening, the device will monitor the relationship between fastener torque and rotation angle. When it deviates a certain amou...

There are three kinds of anti loosing methods: friction anti loosing, mechanical anti loosing and permanent anti loosing. Mechanical locking and friction locking are called detachable locking, while permanent locking is called non detachable locking.