狠狠操2019|爱爱视频网址|欧美在线视频导航|www.xxxxx,欧美日本激情,tvb银狐电视剧粤语高清在线观看,好好生活免费观看完整版高清在线

Main Products
Products Grade: 51B20
Specifications: φ5.5～42mm
Applied Standard:  agreement
Characteristics: This product is used to produce fastener for steel structure of class 10.9.
Applications: Common partsCommon fastenerHigh strength fastener
Use of Products: 51B20 is a steel grade which used to produce high strength bolt of class 10.9 .This product has characteristics of uniform-chemical composition, low percentage of harmful elements, high purity, slight decarburization, good surface quality. After spheroidize annealing, this product has the characteristics of good cold heading properties. And the product has excellent hardenability.