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4Process explanation
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project Processing capacity Detailed process
Number of layers 1-10 floors Qi Mao Electronics Co., Ltd. can produce 1-10 layers through-hole board
biggest size 400mm*600mm For ultra-long boards above 600mm, the width cannot be greater than 300mm
Dimensional accuracy ±0.2mm CNC shape tolerance ± 0.2mm V-cut board shape tolerance ± 0.5mm
Thickness tolerance ±0.1mm Due to production process reasons (sink copper, solder mask, pad spraying will increase the thickness of the board) generally go straight to the tolerance
Finished copper thickness 1OZ/2OZ/3OZ Refers to the thickness of the copper foil on the outer layer of the finished circuit board,1OZ＝35um，2OZ=70um，3OZ=105um
Finished inner copper thickness 35um/50um 1.6 and 2.0 board thickness of the four or six-layer board can be specified according to customer requirements
Minimum clearance 4mil（0.1mm） At present, it can be connected with 4mil line spacing, and the gap should be greater than 6mil, and the price less than 6mil will be slightly more expensive.
Drilling hole diameter (machine drill) 0.2--6.3mm 0.2mm is the minimum hole diameter of the drilled hole, 6.3mm is the maximum hole diameter of the drilled hole, if the factory is larger than 6.3mm, the factory will deal with it separately; 0.65mm is the minimum groove cutter (PTH) hole diameter, if less than 0.65
Finished hole diameter (machine drill) 0.2--6.20mm The metal slot project of mm will be increased to 0.65mm, the minimum hole of the aluminum substrate is 0.8mm, the minimum hole of the aluminum substrate slot is 1.2mm; the minimum hole diameter of the copper-free hole (NPTH) is 0.45mm, if it is less than
Aperture tolerance (machine drill) ±0.08mm Due to the metal copper attached to the inner wall of the hole, the hole diameter of the finished hole is generally smaller than the hole diameter in the document
Minimum character width ≥0.15mm The tolerance of drilling is ± 0.08mm, For example, the hole is designed to be 0.6mm, and the finished hole diameter of the physical board is 0.52--0.68mm, which is qualified and allowed.
Minimum character height ≥0.8mm The minimum width of the characters, if less than 0.15mm, the physical board may cause unclear characters due to design reasons
Character aspect ratio 1:5 The minimum height of characters, if less than 0.8mm, the physical board may cause unclear characters due to design reasons
Route and shape spacing ≥0.3mm（12mil） The most suitable aspect ratio is more conducive to production
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1-4th Floor, Back Building, No. 305 Zhenxing Avenue, Taiyuan Community, Xiegang Town, Dongguan City

Tel: +86 0769-82116029/82116039

Contact: +86 13922507529/Mr. Huang

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