人人做人人干|太久视频网站入口|自拍av网站|龙岭迷窟电影完整版在线观看,国产chinese男男gaygay免费视频,国产网址在线,荆棘电影高清完整版在线观看

Main Products
Products Grade: SCr420B
Specifications: φ16～38mm
Applied Standard: 
Characteristics: This product is used to produce high strength bolt of class 12.9.
Applications: Common partsCommon fastenerHigh strength fastener
Use of Products: SCr420B is a steel grade which used to produce high strength bolt of class 12.9 .This product has characteristics of uniform-chemical composition, low percentage of harmful elements, high purity, slight decarburisation, good surface quality. After spheroidize annealing, this product has the characteristics of good cold heading properties. And the product has excellent hardenability.