Galvanized Steel B7 B7M Nickel Plating Phillips Drive Cross Recessed Truss Head Machine Screw GB973

Galvanized Steel B7 B7M Nickel Plating Phillips Drive Cross Recessed Truss Head Machine Screw GB973

1,Description:

B7 is the ASTM A193/A193M "Alloy Steel and Stainless Steel Bolt Materials at High Temperatures" standard, which is applicable to alloy steel and stainless steel bolt materials on pressure vessels, valves, flanges and fittings used at high temperatures. The minimum yield strength is 723.45 (551.20) MPa; The elongation is 16 (18) %. The maximum hardness is HRC35 (HB235). The material is chromium-molybdenum alloy steel, with American grades 4140 and 4142 selected, which is equivalent to domestic 40CrMo

The main purpose is to make industrial products composed of a fixed body, in the use of teeth and teeth often can not be close, too hard to lock the screw head is broken, or poor dental lock is not tight and failed to meet the conditions of use, are precision problems. Screws are "quantity products", not hand-made artworks, in mass production, in order to achieve high precision and stable quality and popular price supply to consumers for the purpose. The accuracy of the screws is usually 6g (Class 2, the US specification "IFI" is 2A teeth), and the rough screws used in construction projects are 8g (Class 3, "IFI" is 1A teeth).

3,Specifications:

4,Feature Advantage:

B7 is the ASTM A193/A193M "Alloy Steel and Stainless Steel Bolt Materials at High Temperatures" standard, which is applicable to alloy steel and stainless steel bolt materials on pressure vessels, valves, flanges and fittings used at high temperatures. The mechanical performance standard grade A193 B7(or A193 B7M) has a corresponding minimum tensile strength of 861.25 (689.00) MPa. The minimum yield strength is 723.45 (551.20) MPa; The elongation is 16 (18) %. The maximum hardness is HRC35 (HB235). The material is chromium-molybdenum alloy steel, with American grades 4140 and 4142 selected, which is equivalent to domestic 40CrMo

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