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    Screw the standard specification
    Date: 2014-01-22

    The standard is the standard, every country and every sector has its own standards. At present, the most commonly used in the usual business standards are the following:
    GB-Chinese national standard (GB) ANSI-American National Standard (ANSI)
    The ASME-American Society of Mechanical Engineers standard DIN-German Standard (DIN)
    JIS-Japanese National Institute of Standards (JIS) the BSW-British national standards
    GB-national standard is our standard, in addition to industry standards, professional standards and department standards. National standard: GB (mandatory standards) and GB / T (Recommended Standard), and GBn (National internal standard). GB30, GB5783, etc. are mandatory standards that we normally see.
    Several criteria in addition to some basic dimensions, such as different head on the side of the head thickness, the most important is the different of the threaded portion of GB, DIN, JIS, and other threads have is MM (millimeters) as a unit, collectively referred to as a metric thread. Another thread like ANSI, ASME, etc. is known as the American standard thread inches. In addition to the U.S. system of metric thread screw also a BSW-British standards, the thread is in inches, commonly known as the Whitworth thread.
    Metric thread is the MM (mm) as a unit, its teeth sharp corners at 60 degrees. US-made threads and imperial threads are in inches. US-made thread tooth cusp is 60 degrees, while the imperial thread dental cusp of 55 degrees. Due to the different units of measurement, resulting in a variety of threads, said a different approach. Such as the M16-2X60 is a metric thread. His meaning is that the screw nominal diameter 16MM, teeth from 2MM, length 60MM Another example: 1/4-20X3/4 inch threaded the specific meaning of a nominal diameter of the screw 1/4 inches (one inch = 25.4MM), 20 teeth in one inch, 3/4 inches in length. Addition to the US-made screws, then generally in inch screws, followed by UNC and UNF, in order to distinguish the coarse teeth of the US-made or US-made fine tooth.
    We most commonly encountered in the domestic business in the usual standard of GB (GB) and DIN (German standard).
    In the non-raw products, the main access to the following standards: GB30; GB5783; GB5782; GB52; GB6170; GB818; GB819; GB845; GB846; GB70; DIN912; DIN933; DIN931 and so on. GB30 (Old GB) in the standard book has been GB5783 (GB) instead. GB52 (Old GB) in the standard book has been replaced by GB6170 (GB).
    Our country in 1986, the standard developed a new standard in business, commonly known as the new standard, the use of up to GB5780, GB5781, GB5782, GB5783, GB5784. GB5780 for the semi-hexagon head, coarse rod Screw the accuracy grade of C-class products, available GB5782 to replace the (GB5782 coarse rod Screw, hex head, wait until the level of accuracy for Class A and Class B) GB5781 for hex head Screw accuracy rating for the C-class products. Available GB5783 instead (GB5783 for the whole tooth hex head screws, the accuracy level for Class A and Class B). GB5784 is a thin rod and a half teeth hexagonal screws.
    The new standard with the old The difference is: M8, M10, M12, M14, M22 series of products, on the width of the right side differ. In addition to the M22 series of new products, the new standard products M8, M10, M12, M14 head on the edge than the old subject of the side to be small 1MM. 13,16,18,21 the MM, the M22 series of new products, the new standard than the old subject of right side of the contrary, to a large 2MM, special attention should be. The thickness of the head, a slight difference between the new standard and the old standard, common requirements are not very strict circumstances.
    The new standard with Germany The difference is: M10, M12, M14, M22 Product Specifications on the width of the right side differences. M10, M12, M14 head on the side of the new standard than the German standard, small 1MM. M22 new products, and its head on the subject side than the width of the edge 2MM, the other can be generic.
    For the hexagonal nut, common standards are: GB52, GB6170, GB6172, DIN934, the main difference between them: the thickness than the GB52, GB6172, DIN934 to GB6170 thick, commonly known as the thick nut. The other is the series of the difference between the edge of the M8 nut DIN934, GB6170, GB6172 the right side is than the GB52 1MM smaller side 14MM 13MM, M10 nuts, DIN934 GB52 edge 17MM, than GB6170 and GB6172-edge to 1MM, M12 nut, DIN934, GB52 edge 19MM than GB6170 and GB6172-edge 18MM larger 1MM. M14 nut, DIN934, GB52 edge 22MM than GB6170 and GB6172-edge 21MM larger 1MM. Another is the M22 nut, DIN934, GB52-edge 32MM than GB6170, GB6172 the smaller side 34MM 2MM. (GB6170 and GB6172 in addition to its thickness is not the same as the edge width exactly the same as) the remaining specifications in the case without considering the thickness of the common.
    Including hexagonal, GB There are two versions, one for GB70-76, the 76-year version of a GB70-8585 version, the company now perform a DIN912 standard, so should be noted that the difference in the actual business operations: one GB70 differ: GB70-76 DIN912 between the M8 Series Hexagon, GB70-76 round diameter 12.5MM, that -85 and DIN912 completely overlap, and therefore use a new subject, there is no difference. smaller than DIN912 the 13.27MM, the M10 series of products of Hexagon, GB70-76 round, diameter 15MM DIN912 of 16.27, M12 series Hexagon, GB70-76 round diameter 18MM DIN912 the right side of 18.27, and the other like the M16, the M20 series of Hexagon GB70-76 round diameter than the the DIN912 the small 0.33MM, respectively, 24MM, 30MM. DIN912, respectively, from 24.33MM and 30.33MM. Another old standard and German standard within hexagonal inner edge width varies due to different standards, GB70-76 is within the right side is smaller in the business operations should also be noted.
    In addition, the carriage screws usually may be used there are some differences, in this to make a statement, in GB, the standard of the two carriage bolts, namely, GB12 (less than half of the round head square neck screws) and GB14 (more than half round side neck screws), usually more common in the market, the German standard standard DIN603. Now the distinction between these three: round head and neck, in the same specification comparison: GB12. Usually the use of the carriage screw, often require a large, thick head and neck screw DIN603 carriage of standards in full compliance with the requirements.
    Machine screws self-tapping screw. Drilling screw drywall. Chipboard screw 6 wood screws, hexagon wood screws. Waisted screw 9. Combination of screws 10. Mini-screw 11. Furniture screws Electronic screw
    The first type:
    A hexagonal head (hexagon head) 2. Hex head flange (hexagon head with flange) square head (square head) 4.T shaped head T head (hammer the head) 5 oval head, mushroom head (the truss head ) 6 cylinder head (cheese head) round (round head) 8. pan head of pan head countersunk head countersunk head (flat head) and semi-submerged head raised countersunk head (oval
    Philip October / word 3 word 4 within the triangle. Angles Quartet 6. Cross 7. Word flower-shaped. Cinquefoil 10 flower-shaped word 11 special shaped 12 Hexagon

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