久久中文字幕一区二区三区,日本99热,高清av一区,日韩狠狠操,久久久一本精品99久久精品66,1级片网站,aaaaaaa欧美黄色大片

Main Products
Products Grade: GSCM435-C、QSCM435-C、QSCM435-C（SCM435））、QSCM435-MT
Specifications: φ5.5-42mm
Applied Standard:  agreement
Characteristics: high strength fasteners for engineering vehicles.
Applications: high-end parts
Use of Products: GSCM435-C is a commen steel grade which used to produce high strength bolt of class 12.9.This product has characteristics of uniform-chemical composition, low harmful elements, high purity, low decarburisation, good surface quality. Good spheroidization quality, low crack ratio in cold heading,stable heat-treatment properties and uniform hardenability.