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Screw bolt technical requirements
Nov 03, 2017

(1) the material of the screw spike is Q235-A steel, and the technical requirements should meet the requirements of GB700.

(2) the upper thread of the screw spike is M24, the basic size shall conform to GB196, and the thread tolerance shall be manufactured according to the 8g specified in GB197.

(3) the lower thread of the spiral spike is the M25.6 * 6 -- d24.0/25.6 thread, and the tooth height is 3.25 -- 00.25mm.

(4) the end of screw spike is manufactured by GB2.

(5) the forging crack in the surface of the screw plate is not allowed to extend to the rod body.

(6) the upper thread of the screw is not allowed to have the bruise and burr that can prevent the free spiral of the screw thread, and the double-tip, scratches and thread that are not allowed to be used are not complete.

(7) the lower thread of the screw thread should be straight, the thread should be complete, and no splitting marks should be allowed.

(8) the screw surface is not allowed to influence the use of indentation, burrs, frisks, burns and oxidizing skin.

(9) the screw bolt should be tested in kind. When the load is 130kN, the screw should not be broken.

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