中文版The standard is a standard, each country and the department have own standard. At present, we the most Chang Yongdao standard have the following several kinds in the usual service:
GB- China national standards (GB code) ANSI- US national standards (beautiful sign)
DIN- Germany national standards (German sign) ASME- American Society of Mechanical Engineers Association standard
JIS- Japan national standards (date sign) BSW- Britain national standards
The GB- national standards are in our country numerous standard one kinds, in addition has the profession standard, specialized standard and department standard and so on. The national standards divide: GB (compulsory standard) and GB/T (recommendation standard) as well as GBn (country internal standard) and so on. We usually saw elephant GB30, GB5783 and so on is the compulsory standard.
The above several kind of standards besides some basic size like forehead opposite side, forehead thickness and so on are different, what is most main is the thread part difference. GB, DIN, JIS and so on thread has is take MM (millimeter) as a unit, is called for the metric thread. In addition looks like ANSI, ASME and so on thread is called the beautiful sign thread take the inch as the unit. Besides the metric thread and the US standard thread also one kind of BSW- British system standard, its thread is also take the inch as the unit, the popular name whitworth thread.
The metric thread is take MM (millimeter) as a unit, its dental cusp angle is 60 degrees. The US standard thread and the inch thread are take the inch as the unit. The US standard thread's dental cusp angle is also 60 degrees, but inch thread's dental cusp angle is 55 degrees. As a result of Measuring unit's difference, caused each thread expression method to be also different. For example looks like the M16-2X60 expression is metric system's thread. His concrete meaning is expressed that this screw's nominal diameter is 16MM, pitches is 2MM, the length is 60MM, also for example: 1/4-20X3/4 expresses is the British system thread, his concrete meaning is this nominal diameter is 1/4 inch (inch =25.4MM), has 20 teeth in one inch, the length is 3/4 inch. Moreover must express that the US standard screw's words will add on UNC as well as UNF generally in expression British system screw's behind, will distinguish by this is the US standard coarse thread perhaps the US standard fine thread.
In the usual domestic service, the standard which we most often meet is GB (GB code) and DIN (the German sign).
In non-lives the product aspect fragrant, mainly will contact the following several kind of standards: GB30; GB5783; GB5782; GB52; GB6170; GB818; GB819; GB845; GB846; GB70; DIN912; DIN933; DIN931 and so on. At present GB30 (old GB code) (recent GB code) has been replaced in the standard book by GB5783. GB52 (old GB code) (recent GB code) has been replaced in the standard book by GB6170.
In 1986, our country has formulated the new standard to the standard letter, is named generally in the service as the new sign, uses many mainly has GB5780, GB5781, GB5782, GB5783, GB5784. GB5780 is the hexagonal head thick pole half tooth screw, its precision class is the C level product, available GB5782 replaces (GB5782 is the hexagonal head thick pole entire tooth screw, its precision waits till the level is a level and the B level. ) GB5781 is the hexagonal head entire tooth screw, the precision class is the C level product. Available GB5783 replaces (GB5783 is hexagonal head entire tooth screw, its precision class is a level and the B level). GB5784 is the thin pole half tooth's hexagonal screw.
The new sign and the old sign's difference lies in: M8, M10, M12, M14, the M22 series's product, has the difference in the across flats. Besides the M22 series's new product, new sign product M8, M10, M12, the M14 forehead opposite side wants small 1MM compared to the old sign's opposite side. Respectively is 13, 16, 18, 21MM, but the M22 series's new product, the new sign instead wants big 2MM compared to the old sign's opposite side, should the special attention. Regarding the forehead thickness, between the new sign and the old sign slightly has the difference, is not in the very strict situation may use in common in the request.
The new sign and the German sign's difference lies in: M10, M12, M14, the M22 product specification, has a difference in the across flats. M10, M12, the M14 forehead opposite side new sign wants small 1MM compared to the German sign. But the M22 new product, its forehead opposite side wants big 2MM compared to the German sign's across flats, other may use in common.
Regarding the hexagonal nut, the commonly used standard includes: GB52, GB6170, GB6172 and DIN934, the main difference include regarding them between: The GB6170 thickness must thick which compared to GB52, GB6172 and DIN934 comes, is named for the thick cap nut. Moreover is in the opposite side difference, in the M8 cap nut series DIN934, GB6170, the GB6172 opposite side is 13MM wants small 1MM, M10 compared to GB52 opposite side 14MM the cap nut, DIN934 and the GB52 opposite side is 17MM, compared to GB6170 and GB6172 the opposite side wants big 1MM, M12 the cap nut, DIN934, the GB52 opposite side is 19MM wants big 1MM compared to GB6170 and GB6172 opposite side 18MM. Regarding the M14 cap nut, DIN934, the GB52 opposite side is 22MM wants big 1MM compared to GB6170 and GB6172 opposite side 21MM. Moreover is the M22 cap nut, DIN934, the GB52 opposite side is 32MM, compared to GB6170, GB6172 opposite side 34MM wants small 2MM. (GB6170 and GB6172 besides its thickness dissimilar, across flats are completely same) other specifications, in did not consider that thickness in the situation, may use in common.
The hexagonal aspect, in GB code has two editions, one is the GB70-76,76 year edition, one is the GB70-8585 year edition, Our company presently carries out the DIN912 standard, therefore should pay attention to the difference in the actual service operation: And GB70-85 and DIN912 closely coincide, therefore regarding uses the new sign the situation, does not have the difference, is mainly between GB70-76 and DIN912 has the difference: The M8 series's in hexagon product, the GB70-76 round head diameter is 12.5MM, wants small somewhat compared to DIN912 13.27MM, the M10 series's in hexagon product, the GB70-76 round head diameter is 15MM, 16.27 wants small somewhat compared to DIN912, the M12 series's in hexagon, the GB70-76 round head diameter is 18MM, 18.27 wants small somewhat compared to the DIN912 opposite side, in addition looks like M16, M20 the series in hexagon GB70-76 round head diameter to want small 0.33MM compared to DIN912, respectively is 24MM,30MM. DIN912 respectively is 24.33MM and 30.33MM. Moreover in the old sign and the German sign between the hexagonal in across flats are different as a result of the standard and are different, the GB70-76 in opposite side wants small somewhat, should also perform in the service work to pay attention.
Moreover, possibly will usually use the horse-drawn vehicle screw will also have some differences, will also give an explanation in this, in GB code, two stud horse screw cutting's standard, namely GB12 (less than half round head side neck screw) and GB14 (most round head side neck screw), commonly used also will usually have German sign standard DIN603 in the market condition. Presently to these three distinguishes: Regarding round neck, when identical specification comparison is: GB12
Name:
1. the machine screw 2. tapping screw 3. drills the tail bolt 4. wall plate nail 5. fiberboard nail 6. wood screw 7. hexagon wood screw 8. not to leave the bolt 9. assembling bolt 10. miniature bolt 11. furniture bolt 12. electron bolt
Head:
1. the hexagonal head (hexagon head) 2. hexagonal head flange surface (hexagon head with flange) 3. square head (square head) 4.T shape T head (hammer head) 5. flat round head mushroom head (truss head) 6. round column head (cheese head) 7. round head (round head) 8. women's hairdo with hair in a spiral on top or behind the head (pan head) 9. sinks countersunk head (flat head) 10. partly to sink raised countersunk head (oval
Trough:
1. a Philip 2. ten/character 3.1 character 4. in triangle 5. Neichiao four directions 6. cross 7. meter character 8. flower shape 9. quincunx 10. flower shape character 11. special shape 12. in hexagon
