Fastener Product Basics ---Specifications

Fastener Product Basics---Specifications
      Firstly, describe the parameters that need to be marked for fasteners: product name (standard), specifications, material, strength grade, surface treatment. Such as: DIN912, M4-0.7x8, SCM435, 12.9, black.
(1) Product name (standard): Note: For screws without standard, if it is non-standard, you need to provide drawings.
For example, DIN912, the Chinese name is: Hexagon socket head screw, this is the name of the product.
However, the most accurate method is still to call the standard, because GB70 is also the same name; but the two standards have many different sizes.
The most influential standards in the world are: German Standard (DIN), International Standard (ISO), Chinese National Standard (GB), American Standard (ANSI), and Japanese Standard (JIS).
(2) Specifications, the general screw name is the tooth pattern diameter * screw length.
The horn pattern is commonly used in the metric system: M2, M3, M4, M5, M6, M8, M10, M12, etc.
Commonly used in the US system are: 4#-40,6#-32,8#-32,10#-24,1/4-20,5/16-18,3/8-16, 1/2-13, etc.
The length of the screw refers to the effective length of the embedded object. For example, the countersunk screw is loaded with the total length, the half countersunk screw is added with the length of the half head, and the cylindrical head screw length does not include the head size. Such as:
For the specification, the full name is best added with the tooth distance. For example, M4-0.7x8, 4 finger outer diameter is 4mm, 0.7 means that the distance between the two tooth peaks is 0.7mm, and 8 means that the effective length of the embedded object is 8mm.
For the sake of simplicity, without writing the tooth pitch, we defaulted the coarse tooth to the standard tooth because it is the most common; this way it is not marked. This is only the metric system, and the American products still have to be marked.
Here we focus on the specifications of American screws, such as 6#-32*3/8, 6# is the outer diameter of the tooth, close to 3.5mm; 32 is 32 teeth per inch of thread length (equivalent to the metric screw teeth) Distance); 3/8 is the length of the screw (specifically with metric screws).
The two formulas to be remembered here are: tooth outer diameter A#=(Ax0.013+0.06)x25.4(mm), 1 inch=25.4mm.
Among them, 2#=2.2mm, 4#=2.9mm, 6#=3.5mm, 8#4.2mm, 10#=4.8mm are the data to be memorized. The number of teeth corresponding to each specification screw must also be memorized: 2#-56,4#-40,6#-32,8#-32,10#-24,1/4-20,5/16-18 , 3/8-16, 1/2-13 (American standard teeth).
Note: The US UNC tooth is a standard tooth and the UNF is a fine tooth. We defaulted the coarse teeth to standard teeth.
(3) Material: material in the most common order: carbon steel, stainless steel, stainless steel, copper, aluminum and so on.
Carbon steel is further divided into low carbon steel (such as C1008/C1010/C1015/C1018/C1022), medium carbon steel (such as C1035), high carbon steel (C1045/C1050), and alloy steel (SCM435/10B21/40Cr).
Generally, C1008 materials are all grades, such as 4.8 screws, common grade nuts; C1015 general lifting ring screws; C1018 general machine screws, of course, also used to do self-tapping screws; C1022 is generally used for self-tapping screws ; C1035 hits 8.8 screws; C1045/10B21/40Cr hits 10.9 screws; 40Cr/SCM435 hits 12.9 screws.
Stainless steel is the most common with SS302/SS304/SS316. Of course, a lot of SS201 products are also popular nowadays, even products with lower nickel content. We call them non-authentic stainless steel products; the appearance looks like stainless steel, but the corrosion resistance is quite different.
(4) Strength grade: The strength grade mainly refers to carbon steel fasteners.
The common strength grades of carbon steel screws are: 4.8, 5.8, 6.8, 8.8, 10.9, and 12.9. The nuts are correspondingly: 4, 6, 8, 8, and 12.
Generally, the screws below 8.8 are called ordinary screws, while those above 8.8 (including 8.8) are high-strength screws. The difference is that high-strength screws require heat treatment.
(5) Surface treatment: surface treatment is mainly to increase the anti-corrosion performance, but also some of the color, so mainly for carbon steel products, generally need to be surface treated.
Common surface treatments include: blackening, galvanizing, copper plating, nickel plating, chrome plating, silver plating, gold plating, dacromet, hot dip galvanizing, etc.;
There are many types of galvanizing, such as blue and white zinc, blue zinc, white zinc, yellow zinc, black zinc, green zinc, etc., and they are also environmentally friendly and environmentally friendly. Each plating has a variety of plating thickness to meet different Salt spray test effect.
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