Shenzhen Chuanggu Screw Zhu Manager introduced the basic knowledge of black galvanized round head cross self-tapping screws PA.
These tablecloth weights are beautiful! They are larger than the picture indicates and heavy enough to really hold my outside tablecloth on the table when it gets breezy. They make a great gift as they are not easy to find in my city.
These tablecloth weights combine function and style. Put them
on your holiday table this year and no one will even know they are more than a
fun decoration. These tablecloth weights are the picnic-perfect way to weighdown your tablecloths.
Here we first figure out what kind of screw is the cross-head self-tapping screw. The following is a simple introduction of the screw manager Zhu, the so-called cross-head self-tapping screw, which refers to the Phillips pan head self-tapping screw. Expressed by the letter PA. Of course, many people are used to using ST to express. Buyers prefer to use ST as a self-tapping screw. Country label GB845.
Black electroplated zinc, in general, our professional screw people are called black zinc, of course, there are many kinds of electroplated black. We use the electroplated blacks, black, black zinc, and black nickel.
Standard number: GB 845-1985
Standard name: Phillips pan head tapping screw
Standard status: current
English title: Cross recessed pan head tapping screws
Alternative: GB 845-1976
Implementation date: 1986-6-1
Enacting department: National Bureau of Standards
Description: This standard specifies the cross recessed pan head tapping screws with thread specifications ST 2.2 to ST 9.5.
This standard is equivalent to the international standard ISO 7049-1983 "cross-slot pan head self-tapping screws". 
Material
Crosshead self-tapping screws, cross-semi-head self-tapping screws PA, material, there are two main types, one is iron, but the other is stainless steel "target=_blank> stainless steel. These two applications are more common. There are also three applications that are less, such as copper, aluminum, and titanium. These three reasons are due to the high cost of the product. Therefore, customers rarely use these three materials when they are used.
plating
Phillips pan head self-tapping screws, cross-semi-head self-tapping screws ST, electroplating, this is very normal, generally iron pan head self-tapping screws are required to be electroplated. Stainless steel "target=_blank> stainless steel round head self-tapping screws, generally do not need electroplating. Electroplating is divided into environmental protection and non-environmental protection. Electroplating colors are: color zinc, white zinc, white nickel, black zinc, black nickel, black, Army Green and so on.
Specification standard size
In general, the swash plate self-tapping screws we are doing now go from the minimum size of 1.4. Of course, some screw companies can achieve 0.8. But this is a minority, generally more is from the beginning of 1.4, to the self-tapping screws of the M6. M8 was less before. The length is usually 5-60. Too long is generally not in stock. The following table is issued for the pan head tapping screw size specification table: 
The source of this article: Shenzhen Chuanggu screw network: http://, if there is a reprint, please bring a link. Thank you!
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
TableCloth Weight,Heavy Duty Tablecloth Weights,Stainless Steel Tablecloth Weights,Decorative Tablecloth Weights
Eco Household Co. Ltd , https://www.yj-ecohousehold.com