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Round flat head nonstandard step screw

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Excellent OEM 

The thread is deep, the force is uniform, the screw tooth is more sharp, the rotation process is not easy to slip.

Round flat head non-standard step SCREW

Thread to show


Three Major Advantages

Details determine success or failure


Excellent OEM 

Factory direct!

Shorten the distance between the factory and the buyer!

Round flat head

non-standard step SCREW

Focus on production screw

The surface adopts heat treatment, electroplating, pit corrosion ability is strong!

Round flat head non-standard step SCREW


Carbon steel is used



   Standards are norms, and each country and department has its own standards.We often use the following criteria in our usual business: 
GB - China national standards (GB) 
ANSI - American national standards (American standard); 
DIN - German national standard (German standard) 
ASME - American mechanical engineers association standard; 
JIS - Japanese national standard (Japanese standard) 
BSW - British national standard; 
GB - national standards are one of many standards in China, and there are industry standards, professional     standards and departmental standards.National standards: GB (mandatory) and GB/T (recommended standards) and GBn (national internal standards).What we normally see is like GB30, GB5783, etc., which are mandatory standards. 
   All of these criteria except for the basic size of the head, the thickness of the head and the thickness of the head, and the main part is the different part of the thread.The threads of GB, DIN and JIS are all in MM (MM) and are collectively called metric threads.Other threads, such as ANSI and ASME, are called American standard threads in inches.In addition to the metric thread and the American thread, there is also a BSW - English standard, which is also used in inches, commonly known as wyeth thread.
In the daily domestic sales business, we often meet the standard GB (national standard) and DIN (German standard).
   In terms of raw products, the following criteria are mainly met: GB30;GB5783;GB5782;GB52;GB6170;GB818;GB819;GB845;GB846;GB70;DIN912;DIN933;DIN931, etc.GB30 (old national standard) has been replaced by GB5783 (new national standard) in the standard book.GB52 (the old national standard) has been replaced by GB6170 (new national standard) in the standard book.

The screw head


The screw head is smooth and smooth,the force is evenly fastened, and the effect is better

Round flat head non-standard step SCREW

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