National standard for screws:
Standards are norms, and every country and department has its own standards. GB- Chinese national standard (GB)ANSI—- American national standard (American standard)
DIN-German national standard (German standard) ASME-american society of mechanical engineers standard.
Jis-Japanese national standard (Japanese standard) bsw-British national standard
G B- national standard is one of many standards in China, as well as industry standards, professional standards and departmental standards. National standards are divided into: GB (mandatory standards) and GB/T (recommended standards) and GBn (national internal standards). What we usually see, such as GB30 and GB5783, are mandatory standards.
Except for some basic dimensions, such as the opposite side of the head and the thickness of the head, the above standards are mainly different from the threaded part. Thread of GB, DIN, JIS and other standards. They are all in millimeters and are collectively referred to as metric threads. Another thread similar to ANSI and ASME is called American standard thread in inches. In addition to metric thread and American thread, there is also a BSW-British standard, whose thread is also inches, commonly known as Wyeth thread.
In the usual domestic sales business, the most common standards we encounter are GB (National Standard) and DIN (German Standard).
In terms of raw products, we will mainly come into contact with the following standards: GB 30 GB 5783 GB 5782 GB 52 GB 6170; GB 8 18； GB 8 19； GB845GB846GB70din 9 12； DIN933DIN93 1 etc. GB30 (old national standard) in the standard book has been replaced by GB5783 (new national standard). GB52 (old national standard) in the standard book has been replaced by GB6 170 (new national standard).
Screw manufacturer's recommendation and wholesale quotation
Screw/nut
Starting price: ￥0.2
MOQ:10000m3
Model: M 16
Brand: Huangting
Product specification: qualified
Company name: Foshan Nanhai District Danzao Chaoting Hardware Factory
ASME/ANSI？ b？ 18.6
Starting price: ￥0. 1
MOQ: 1 piece
Brand: Ying Da YT
Model: ASME/ANSI? b？ 18.6.2- 1
Processing customization: Yes
Company name: Hebei Ying Da Industrial and Mining Machinery Parts Co., Ltd.
screw
Starting price: ￥2
MOQ: 100 piece
Model: All available
Brand: TH/ shixin
Product specifications: screws
Company name: Foshan Shunde Gu Rong Hardware Products Co., Ltd.
M4-2
Starting price: ￥ 1.2
MOQ: 3000 pieces
Head type: round head
Material: aluminum shell+stainless steel screws
Mode of action: riveting
Company name: Shenzhen Chang Yongsheng Hardware Co., Ltd.
screw
Starting price: ￥0.03
MOQ: 1 piece
Brand: Feiheng
Model: GB
Processing customization: No.
Company name: Wenzhou Longwan Zhou Pu Feiheng Standard Parts Sales Department.
The above is a detailed introduction of the national standard for screws. Do you think it is amazing after reading it? Small parts, great effect, but only buy qualified screws? It can play its due role. If you buy screws with poor quality, it will not only affect the progress of the work but also cause economic losses, such as buying screws with burrs or burrs. The reason may be the poor forming of the first punch, which is mainly caused by the gap between the punch and the die hole being too large or the punch being too short. Pay more attention when purchasing.