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Normally, 6# (inclusive) is used with the 2nd tail, 8# (including) or more with the 3rd tail, 8#, 10# is less than 1/2 (inclusive), and the flat head is 5 When /8 (inclusive), the second tail is made, and the remaining 10# or more exceeds the length of this specification to make the 3rd tail, and the lower limit of the required length of the flat BSD2 and 3 ends is:
6#, 8#: Z2——13.00mm Z3——16.00mm
10#: Z2——16.00mm Z3——19.00MM
12#:Z3——22.00mm
14#: Z3——25.00mm
2, stainless steel round head Huasi drill tail screw length: when the length is within 1-1/2in for the whole tooth, greater than 1-1/2in for the half tooth, the tooth length is 1-1/2in.
3, BSD type and CSD type screw introduction:
(1) CSD type screw is a stainless steel round head washer drill screw thread. The diameter-pitch combination is similar to the uniform thread, and the end of the drill of different switches. The end is marked as No. 2 or No. 3, and its design The type is compatible with different sheet thickness conditions. CSD type screws do not need to be threaded, but they should conform to the standard specifications. Generally, those with machine screw threads are more advantageous than pitch threads, CSD type screws, CSD type Screws with a nominal length of 1.50 in or less shall be full threaded screws, blank under the head, including threaded ends, and shall be 1 pitch or smaller.
(2) BSD type stainless steel round head Washer screw should have pitch thread and different shape of drill bit end. The drill bit is usually No. 2 or No. 3, and its design is compatible with different sheet thickness conditions. When the nominal length is equal to less than 1.50 inches, it is a full-tooth screw. The thread under the head, including the thread end, should be 1 pitch, if possible, should be smaller.
4. At present, the common stainless steel round head Huawei drill head type has hexagonal head (HW), pan head (P) and countersunk head (F).
5, the tooth type mainly has BSD teeth and CSD teeth , the difference is that the BSD tooth type is the tooth shape of the AB tooth in the self-tapping nail, and the CSD tooth is a mechanical tooth.
6. Reference standard SAE J 78-1998
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DIN7504