色五月视频,久中文字幕中文字幕亚洲无线,国产大片在线看,欧美啪啪精品,国产精品欧美日韩,国产福利在线观看永久免费

Presentation of steel bolts

1 Definition
  Steel bolt is a kind of high-strength bolts, also standard parts. Fastening performance is better, for the steel, engineering, fastening action. General steel, steel bolt requirements are more than 8.8, there are 10.9, 12.9, and are all high-strength steel bolts, steel bolts on sometimes does not require plating with character can be.

2 Applications
  Steel bolts are used in the steel structure engineering, steel plates used to connect the points of connection.

3 Classification
  Steel bolt into torsional shear type high strength bolts and high strength large hexagonal bolts, large hexagonal belonging to the ordinary high-strength bolts screws high intensity level, and torsional shear type high strength bolts are hexagon improved high-strength bolts, in order to better construction.

4 Construction Notes
  Construction steel bolts must be tight tight end early after the beginning of the impact of tight steel bolts required electric adjustable wrench or torque electric wrench; and tight end steel bolts, there are strict requirements, tight end torsional shear steel bolts must with torsional shear electric wrench, tight end torque type steel bolts must be electric torque wrench.
Large hexagon structural bolts from a bolt, a nut, two washers.
Torsional shear steel bolt by a bolt, a nut and a washer components.