Cotter pin is a kind of mechanical parts, in order to avoid damage to the hole wall, grease can be added to the pin hole, the production of this part needs to use high quality steel, good elastic rigid materials.Used to prevent loose thread connection. After the nut is tightened, insert the cotter pin into the nut slot and the tail hole of the bolt, and open the tail of the cotter pin to prevent the relative rotation of the nut and the bolt. Cotter pin is a kind of metal hardware, common name spring pin. Toughness: each foot of the cotter pin should be able to withstand repeated bending, without fracture or crack in the bending part. Bending method: pull open the cotter pin and clamp the foot part in the inspection mold (flattening phenomenon should not occur); Then the cotter pin is bent 90°, and a round trip is a bend. The test speed should not exceed 60 times /min. Inspection mold should be made out of a semicircular slot, its diameter is the nominal specification of the cotter pin. The jaws should have rounded corners r=0.5mm. Eye circles should be rounded as much as possible. The cross section of the cotter pin should be round, but allow the cotter pin bipedal plane and circumferential intersection there is a radius. The gap between two cotter pins and the wrong movement of two legs should not be greater than the nominal specification of cotter pins. Opening pin allows to make an opening, the included Angle of the plane inside its bipedal should accord with specifications. Surface defects: there shall be no burr, irregular or harmful defects on the surface of split pins
Handan Chang Lan Fastener Manufacturing Co., Ltd. formerly Yongnian Tiexi Changhe fastener factory was large-scale standard fastener manufacturer in Yongnian District. The company is located in standard fastener distribution center of Hebei Yongnian, covering an area of 3,050 square meters, was close to Tianjin Port and Qingdao ports, export is very convinedtly. The company has multi position cold heading machine, model 12b, 14b, 16b, 24b, 30b, 33b; has hot forging machine, model has 200 tons, 280 tons, 500 tons, 800 tons;Has a variety of supporting equipment, including rolling machine, rolling machine, oil press, etc. for bolts, nuts, double stud bolts , foundation bolts and complete product testing equipment. With an experienced technical research and development team, high-quality management personnel and spacious production environment.
